{"id":4055,"date":"2026-08-06T09:35:55","date_gmt":"2026-08-06T09:35:55","guid":{"rendered":"https:\/\/ycpcbs.com\/?page_id=4055"},"modified":"2026-08-10T02:21:30","modified_gmt":"2026-08-10T02:21:30","slug":"communication-series-4-layer-fr4-pcb-with-enig","status":"publish","type":"page","link":"https:\/\/ycpcbs.com\/de\/communication-series-4-layer-fr4-pcb-with-enig\/","title":{"rendered":"Communication Series 4 Layer FR4 PCB with ENIG"},"content":{"rendered":"<style>\n    :root {\n      --primary: #34C759;\n      --primary-dark: #28a745;\n      --primary-light: #eaf9ee;\n      --ink: #0f172a;\n      --muted: #475569;\n      --soft: #f8fafc;\n      --line: #e2e8f0;\n      --white: #ffffff;\n      --teal: #0f766e;\n      --blue: #2563eb;\n      --gold: #c99700;\n      --amber: #f59e0b;\n      --shadow: 0 24px 70px rgba(15, 23, 42, 0.08);\n      --radius: 28px;\n    }\n    * { box-sizing: border-box; }\n    html { scroll-behavior: smooth; }\n    body {\n      margin: 0;\n      font-family: Inter, Arial, sans-serif;\n      color: var(--ink);\n      background: #fff;\n      line-height: 1.65;\n    }\n    a { color: inherit; 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}\n    .pcb-visual::after { inset: 100px 34px 38px 96px; }\n    .pcb-lines {\n      position: absolute;\n      inset: 0;\n      background-image:\n        linear-gradient(90deg, transparent 0 12%, rgba(255,255,255,.12) 12% 12.6%, transparent 12.6% 100%),\n        linear-gradient(0deg, transparent 0 17%, rgba(255,255,255,.10) 17% 17.5%, transparent 17.5% 100%);\n      background-size: 86px 70px;\n      opacity: .8;\n    }\n    .via-dot {\n      position: absolute;\n      width: 11px;\n      height: 11px;\n      border-radius: 50%;\n      background: rgba(255,255,255,.8);\n      box-shadow: 0 0 0 6px rgba(255,255,255,.11);\n      z-index: 2;\n    }\n    .via-dot.a { top: 135px; left: 170px; }\n    .via-dot.b { top: 230px; left: 280px; }\n    .via-dot.c { top: 340px; right: 190px; }\n    .via-dot.d { top: 190px; right: 100px; }\n    .gold-pad {\n      position: absolute;\n      width: 78px;\n      height: 20px;\n      border-radius: 999px;\n      background: linear-gradient(90deg, #facc15, #f59e0b);\n      z-index: 2;\n      opacity: .95;\n      box-shadow: 0 10px 22px rgba(0,0,0,.14);\n    }\n    .gold-pad.p1 { left: 92px; 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margin-top: 6px; color: var(--muted); font-size: 12px; font-weight: 750; }\n    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }\n    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }\n    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }\n    .card {\n      background: #fff;\n      border: 1px solid var(--line);\n      border-radius: var(--radius);\n      padding: 26px;\n      box-shadow: 0 14px 34px rgba(15,23,42,.04);\n    }\n    .card:hover { border-color: rgba(52,199,89,.42); }\n    .card p { margin-top: 10px; }\n    .icon {\n      width: 44px;\n      height: 44px;\n      border-radius: 15px;\n      background: var(--primary-light);\n      color: #15803d;\n      display: inline-flex;\n      align-items: center;\n      justify-content: center;\n      font-weight: 900;\n      margin-bottom: 16px;\n    }\n    .image-card { overflow: hidden; padding: 0; }\n    .image-area {\n      height: 225px;\n      border-radius: 28px 28px 0 0;\n      background:\n        radial-gradient(circle at 25% 30%, rgba(52,199,89,.22), transparent 28%),\n        radial-gradient(circle at 80% 80%, rgba(15,118,110,.15), transparent 30%),\n        linear-gradient(135deg, #f8fafc, #eaf9ee);\n      position: relative;\n      display: flex;\n      align-items: center;\n      justify-content: center;\n      padding: 18px;\n    }\n    .image-area img { width: 100%; 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margin-top: 6px; }\n    .cta-band {\n      border-radius: 36px;\n      background:\n        radial-gradient(circle at 82% 20%, rgba(52,199,89,.26), transparent 32%),\n        linear-gradient(135deg, #0f172a, #064e3b);\n      padding: 56px;\n      color: #fff;\n      overflow: hidden;\n      position: relative;\n    }\n    .cta-band p { color: #cbd5e1; max-width: 780px; margin-top: 16px; font-size: 17px; }\n    .cta-band .btn.secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,.25); }\n    .faq { display: grid; gap: 14px; }\n    details {\n      background: #fff;\n      border: 1px solid var(--line);\n      border-radius: 22px;\n      padding: 18px 20px;\n      box-shadow: 0 10px 26px rgba(15,23,42,.03);\n    }\n    summary { cursor: pointer; font-weight: 850; color: #172033; }\n    details p { margin-top: 12px; }\n    .breadcrumb { font-size: 13px; color: #64748b; font-weight: 650; margin-bottom: 22px; }\n    .breadcrumb a { color: #166534; }\n    .mini-label { color: #166534; font-weight: 850; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; }\n    .related-card {\n      display: grid;\n      gap: 12px;\n      border-radius: 28px;\n      padding: 24px;\n      background: #fff;\n      border: 1px solid var(--line);\n    }\n    .related-card strong { font-size: 20px; letter-spacing: -.02em; }\n    .related-card a { color: #15803d; font-weight: 850; }\n    .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; }\n    .quote-item {\n      border-radius: 18px;\n      background: #fff;\n      border: 1px solid var(--line);\n      padding: 15px 16px;\n      font-weight: 780;\n      color: #1e293b;\n    }\n    .quote-item::before { content: \"\u2713\"; color: var(--primary-dark); margin-right: 8px; font-weight: 900; }\n    .spec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }\n    .spec-card {\n      border-radius: 24px;\n      padding: 22px;\n      background: #fff;\n      border: 1px solid var(--line);\n    }\n    .spec-card .mini-label { display: block; 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}\n      .btn { width: 100%; }\n      .image-area { height: 190px; }\n      .hero-tags span { font-size: 12px; }\n    }\n  \n    \/* Prevent WordPress theme\/page classes from locking vertical scrolling *\/\n    body.page,\n    body.single,\n    body.page-template-default {\n      overflow-y: auto !important;\n    }\n\n    main.yc-fr4-product-page {\n      overflow-x: hidden !important;\n      overflow-y: visible !important;\n    }\n\n\n\/* <a href=\"\/about\/\" style=\"font-weight:bold;color:var(--e-global-color-primary,#0058e6);text-decoration:underline;\">YC PCB<\/a> Contact Popup *\/\n.ycpcbs-contact-popup {\n  display:none;\n  position:fixed;\n  inset:0;\n  z-index:99999;\n  align-items:center;\n  justify-content:center;\n  padding:20px;\n  background:rgba(2,6,23,.72);\n  backdrop-filter:blur(8px);\n  -webkit-backdrop-filter:blur(8px);\n}\n\n.ycpcbs-contact-popup:target {\n  display:flex;\n}\n\n.ycpcbs-popup-dialog {\n  position:relative;\n  width:min(560px,100%);\n  max-height:calc(100vh - 40px);\n  overflow:auto;\n  background:#ffffff;\n  border:1px solid #dbe5ee;\n  border-radius:28px;\n  box-shadow:0 28px 80px rgba(2,6,23,.28);\n  padding:30px;\n}\n\n.ycpcbs-popup-close {\n  position:absolute;\n  top:16px;\n  right:18px;\n  width:38px;\n  height:38px;\n  display:grid;\n  place-items:center;\n  border-radius:50%;\n  background:#f8fafc;\n  border:1px solid #e2e8f0;\n  color:#0f172a!important;\n  font-size:24px;\n  line-height:1;\n  font-weight:700;\n}\n\n.ycpcbs-popup-close:hover {\n  background:#f1f5f9;\n}\n\n.ycpcbs-popup-head {\n  padding-right:44px;\n  margin-bottom:22px;\n}\n\n.ycpcbs-popup-head h3 {\n  margin:0;\n  font-size:28px;\n  line-height:1.18;\n  color:#0f172a!important;\n}\n\n.ycpcbs-popup-head p {\n  margin-top:10px;\n  color:#64748b!important;\n  font-size:15px;\n  line-height:1.65;\n}\n\n.ycpcbs-contact-popup label {\n  display:block;\n  margin:0 0 8px;\n  color:#0f172a!important;\n  font-weight:800!important;\n  font-size:14px!important;\n}\n\n.ycpcbs-contact-popup input,\n.ycpcbs-contact-popup textarea {\n  width:100%!important;\n  border:1px solid #cbd5e1!important;\n  background:#ffffff!important;\n  color:#0f172a!important;\n  border-radius:14px!important;\n  padding:13px 14px!important;\n  font-family:'Inter',sans-serif!important;\n  font-size:15px!important;\n  line-height:1.5!important;\n  outline:none!important;\n  box-shadow:none!important;\n  box-sizing:border-box!important;\n}\n\n.ycpcbs-contact-popup input:focus,\n.ycpcbs-contact-popup textarea:focus {\n  border-color:#34C759!important;\n  box-shadow:0 0 0 4px rgba(52,199,89,.12)!important;\n}\n\n.ycpcbs-contact-popup textarea {\n  min-height:135px!important;\n  resize:vertical!important;\n}\n\n.ycpcbs-popup-field {\n  margin-bottom:16px;\n}\n\n.ycpcbs-popup-submit {\n  width:100%;\n  min-height:54px;\n  border:0;\n  border-radius:999px;\n  background:#34C759;\n  color:#052e16!important;\n  font-weight:800;\n  font-size:15px;\n  cursor:pointer;\n  box-shadow:0 16px 34px rgba(52,199,89,.24);\n}\n\n.ycpcbs-popup-submit:hover {\n  background:#2eb94f;\n}\n\n.ycpcbs-popup-submit:disabled {\n  opacity:.65;\n  cursor:not-allowed;\n}\n\n.ycpcbs-popup-note {\n  margin-top:14px;\n  text-align:center;\n  font-size:13px;\n  line-height:1.55;\n  color:#64748b!important;\n}\n\n.ycpcbs-popup-note a {\n  color:#166534!important;\n  font-weight:800;\n}\n\n@media(max-width:640px) {\n  .ycpcbs-contact-popup {\n    padding:12px;\n    align-items:flex-end;\n  }\n\n  .ycpcbs-popup-dialog {\n    width:100%;\n    max-height:88vh;\n    border-radius:24px 24px 18px 18px;\n    padding:24px 18px 20px;\n  }\n\n  .ycpcbs-popup-head h3 {\n    font-size:24px;\n  }\n}\n\n<\/style>\n<main class=\"yc-fr4-product-page\">\n<section class=\"hero\">\n<div class=\"container hero-inner\">\n<div>\n<div class=\"breadcrumb\"><a href=\"\/\">Home<\/a> \/ <a href=\"\/products\/fr4-pcb\/\">FR4 PCB<\/a> \/ Communication Series 4 Layer FR4 PCB with ENIG<\/div>\n<div class=\"eyebrow\">FR4 PCB Product Page<\/div>\n<h1>4 Layer FR4 PCB <span>with ENIG<\/span><\/h1>\n<div class=\"hero-sub\">Communication Series FR4 Circuit Boards for Network Modules, Gateways and Control Interfaces<\/div>\n<p class=\"hero-copy\">YC PCB supplies communication-series 4 layer FR4 PCBs with ENIG finish for network modules, industrial gateways and control interfaces. Production can include stack-up confirmation, custom copper weight, AOI, electrical testing and optional SMT\/THT assembly based on your Gerber, drill, BOM and test files.<\/p>\n<div class=\"hero-tags\">\n<span>4 Layer FR4 PCB<\/span>\n<span>ENIG Surface Finish<\/span>\n<span>Communication Electronics<\/span>\n<span>Stack-Up Review<\/span>\n<span>AOI + Electrical Test<\/span>\n<span>PCB + PCBA Support<\/span>\n<\/div>\n<div class=\"btns\">\n<a class=\"btn primary\" href=\"#ycpcbs-contact-popup\">Send Gerber for Review<\/a>\n<a class=\"btn secondary\" href=\"#capability\">View Product Specs<\/a>\n<\/div>\n<\/div>\n<div class=\"hero-panel\">\n<div class=\"pcb-visual\">\n<img alt=\"communication series 4 layer FR4 PCB with ENIG finish for network modules and industrial gateways\" decoding=\"async\" fetchpriority=\"high\" loading=\"eager\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp\"\/>\n<\/div>\n<div class=\"hero-stat-row\">\n<div class=\"hero-stat\"><strong>4L<\/strong><span>FR4 Stack-Up Route<\/span><\/div>\n<div class=\"hero-stat\"><strong>ENIG<\/strong><span>Flat Solderable Finish<\/span><\/div>\n<div class=\"hero-stat\"><strong>DFM<\/strong><span>File Review Before Quote<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"overview\">\n<div class=\"container\">\n<div class=\"section-head center\">\n<div class=\"eyebrow\">Product Display<\/div>\n<h2>Communication PCB Details<\/h2>\n<p>Confirm the board outline, ENIG pad requirements, via and hole data, routing density, connector positions and assembly scope before placing the order.<\/p>\n<\/div>\n<div class=\"grid-4\">\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"communication series 4 layer FR4 PCB with green solder mask and ENIG pads\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/07\/4-layer-FR4-PCB.jpg\"\/><\/div>\n<div class=\"image-body\"><h3>Full Board View<\/h3><p>Provide the finished board dimensions, mounting-hole tolerances, connector orientation and panel requirements for production confirmation.<\/p><\/div>\n<\/article>\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"ENIG pad and green solder mask detail for 4 layer FR4 PCB SMT assembly\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/02\/Green-solder-mask-with-ENIG.jpg\"\/><\/div>\n<div class=\"image-body\"><h3>ENIG Pad Detail<\/h3><p>Specify component pitch, exposed-pad areas, storage period and soldering process so the ENIG finish can be matched to the assembly requirement.<\/p><\/div>\n<\/article>\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"via holes and dense routing area on communication 4 layer FR4 circuit board\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/03\/4-Layer-PCB1.jpg\"\/><\/div>\n<div class=\"image-body\"><h3>Via &amp; Routing Area<\/h3><p>Supply complete drill data and identify signal-sensitive areas so via construction, routing clearance and ground-return paths can be checked before release.<\/p><\/div>\n<\/article>\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"finished communication PCB assembly with SMT components and connector areas\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2026\/05\/Finished-PCBA.png\"\/><\/div>\n<div class=\"image-body\"><h3>PCBA Route<\/h3><p>For assembled modules, include the BOM, centroid file, assembly drawing, approved substitutions and functional-test requirements with the PCB package.<\/p><\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"capability\">\n<div class=\"container\">\n<div class=\"section-head\">\n<div class=\"eyebrow\">Product Parameters<\/div>\n<h2>4 Layer FR4 PCB Specs<\/h2>\n<p>The specifications below cover the principal purchasing items for this 4 layer FR4 PCB. Final material, thickness, copper weight, stack-up, finish and delivery schedule are confirmed from the manufacturing files and order quantity.<\/p>\n<\/div>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr><th>Item<\/th><th>Specification \/ Review Content<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Product Type<\/td><td>Communication Series 4 Layer FR4 PCB with ENIG<\/td><\/tr>\n<tr><td>PCB Structure<\/td><td>Four-layer rigid FR4 circuit board with two outer signal layers and project-defined inner ground, power or signal layers<\/td><\/tr>\n<tr><td>Base Material<\/td><td>FR4 or high-Tg FR4 selected according to operating temperature, assembly process and reliability requirements<\/td><\/tr>\n<tr><td>Surface Finish<\/td><td>ENIG for flat component pads, oxidation protection, solderability and storage before assembly<\/td><\/tr>\n<tr><td>Solder Mask<\/td><td>Green, blue, black or white LPI solder mask according to the approved drawing and marking requirements<\/td><\/tr>\n<tr><td>Copper Weight<\/td><td>Common 1 oz or custom copper weight selected according to current, trace geometry and copper-balance requirements<\/td><\/tr>\n<tr><td>Board Thickness<\/td><td>Finished thickness confirmed from the mechanical drawing, connector geometry and approved stack-up<\/td><\/tr>\n<tr><td>Stack-Up<\/td><td>Signal, ground, power and bottom-layer functions confirmed from Gerber data and electrical requirements<\/td><\/tr>\n<tr><td>Routing Review<\/td><td>Signal return paths, via construction, copper balance, clearances, panelization and controlled-<a href=\"\/impedance-control-pcb-30-layer-with-8oz-copper\/\" style=\"font-weight:bold;color:var(--e-global-color-primary,#0058e6);text-decoration:underline;\">impedance<\/a> notes<\/td><\/tr>\n<tr><td>Edge Process<\/td><td>CNC routing, V-Cut, breakaway tabs and tooling selected according to board outline and assembly method<\/td><\/tr>\n<tr><td>Testing Support<\/td><td>AOI, electrical continuity\/isolation testing, dimensional inspection and final visual inspection<\/td><\/tr>\n<tr><td>Assembly Support<\/td><td>SMT, THT and mixed assembly, including BGA\/QFN processing and project-defined functional testing<\/td><\/tr>\n<tr><td>Files Needed<\/td><td>Gerber RS-274X, Excellon drill data, stack-up notes, mechanical drawing, quantity and BOM\/centroid files for PCBA<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"note green\">Quotation is based on the complete construction, not board dimensions alone. Provide stack-up, copper weight, ENIG specification, controlled-impedance notes, assembly scope and testing requirements.<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"why-four-layer\">\n<div class=\"container\">\n<div class=\"section-head center\">\n<div class=\"eyebrow\">Buyer Decision<\/div>\n<h2>Why 4 Layer FR4?<\/h2>\n<p>Communication electronics often need more routing space and a more continuous ground reference than a 2 layer board provides. A 4 layer FR4 structure supports separate signal, ground and power functions while keeping material and fabrication costs practical.<\/p>\n<\/div>\n<div class=\"grid-3\">\n<article class=\"card\"><div class=\"icon\">01<\/div><h3>More Routing Space<\/h3><p>Four copper layers provide additional routing capacity for communication interfaces, controller ICs, connectors and supporting power circuits.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">02<\/div><h3>Ground Reference Review<\/h3><p>Dedicated ground and power layers provide clearer return paths and reduce conflicts between signal routing and power distribution.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">03<\/div><h3>ENIG Assembly Support<\/h3><p>ENIG provides a flat, oxidation-resistant solderable surface for fine-pitch SMT pads, connector pads and boards that may be stored before assembly.<\/p><\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"stackup\">\n<div class=\"container split\">\n<div class=\"dark-card\">\n<div class=\"eyebrow\">Stack-Up Review<\/div>\n<h2 style=\"color: #ffffff;\">4 Layer Stack-Up<\/h2>\n<p style=\"margin-top:16px\">The stack-up is defined from the Gerber files, finished thickness, copper weight and electrical requirements. Signal direction, ground reference, power distribution, via transitions and assembly constraints are considered together.<\/p>\n<div class=\"layer-stack\">\n<div class=\"layer-row\"><strong>Top Layer<\/strong><span>Components, signal routing, connector pads and ENIG SMT areas<\/span><\/div>\n<div class=\"layer-row\"><strong>Inner Layer 1<\/strong><span>Ground reference, return path and noise control review<\/span><\/div>\n<div class=\"layer-row\"><strong>Inner Layer 2<\/strong><span>Power distribution, ground split or routing support according to design<\/span><\/div>\n<div class=\"layer-row\"><strong>Bottom Layer<\/strong><span>Signal routing, test points, component pads or connector support<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"card\">\n<div class=\"mini-label\">What YC PCB checks before production<\/div>\n<h2 style=\"margin-top:8px\">Engineering Review<\/h2>\n<div class=\"check-list\">\n<div class=\"check\"><b>1<\/b><div><strong>Layer Definition<\/strong><span>Gerber layer order, copper layers, solder mask, silkscreen and drill files should be complete.<\/span><\/div><\/div>\n<div class=\"check\"><b>2<\/b><div><strong>Ground and Power Planes<\/strong><span>Ground return, power path, split plane areas and copper balance are reviewed according to the design.<\/span><\/div><\/div>\n<div class=\"check\"><b>3<\/b><div><strong>Via and Hole Attributes<\/strong><span>PTH, NPTH, connector holes and mechanical holes should be clearly defined in the drill file.<\/span><\/div><\/div>\n<div class=\"check\"><b>4<\/b><div><strong>Assembly Risk<\/strong><span>Fine-pitch pads, connector pads, BGA \/ QFN areas and testing access are reviewed if PCBA is required.<\/span><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"applications\">\n<div class=\"container\">\n<div class=\"section-head\">\n<div class=\"eyebrow\">Applications<\/div>\n<h2>Communication PCB Applications<\/h2>\n<p>This board route is suitable for communication products requiring moderate routing density, multiple connectors, stable SMT assembly and a cost-effective FR4 construction.<\/p>\n<\/div>\n<div class=\"grid-4\">\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"communication electronics and network module application for 4 layer FR4 PCB\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2026\/05\/Communication-Electronics.png\"\/><\/div>\n<div class=\"image-body\"><h3>Network Modules<\/h3><p>Suitable for router interfaces, network adapters and communication modules requiring internal ground or power layers.<\/p><\/div>\n<\/article>\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"industrial gateway and control electronics application for communication FR4 PCB\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2026\/05\/Industrial-Control.png\"\/><\/div>\n<div class=\"image-body\"><h3>Industrial Gateways<\/h3><p>Suitable for gateway control boards combining communication interfaces, control ICs, connectors and local power circuits.<\/p><\/div>\n<\/article>\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"ENIG FR4 PCB for signal control and communication interface electronics\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/03\/ENIG-PCB.png\"\/><\/div>\n<div class=\"image-body\"><h3>Signal Control Boards<\/h3><p>Suitable for signal conversion, interface management and mixed digital-control circuitry.<\/p><\/div>\n<\/article>\n<article class=\"card image-card\">\n<div class=\"image-area\"><img alt=\"communication FR4 PCB assembly with SMT components and ENIG surface finish\" decoding=\"async\" loading=\"lazy\" onerror=\"this.onerror=null;this.src='https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/09\/114-Layer-FR4-PCB-ENIG-scaled.webp';\" src=\"https:\/\/ycpcbs.com\/wp-content\/uploads\/2025\/03\/PCBA1.jpg\"\/><\/div>\n<div class=\"image-body\"><h3>Communication PCBA<\/h3><p>Available as bare PCB or assembled PCBA with BOM sourcing, SMT\/THT placement and project-defined testing.<\/p><\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"enig\">\n<div class=\"container\">\n<div class=\"section-head center\">\n<div class=\"eyebrow\">Surface Finish<\/div>\n<h2>Why ENIG Finish?<\/h2>\n<p>ENIG is a practical choice when the project requires flat component pads, reliable solderability, exposed contact areas or storage before assembly.<\/p>\n<\/div>\n<div class=\"table-wrap\">\n<table>\n<thead><tr><th>Buyer Concern<\/th><th>How ENIG Helps<\/th><th>What to Confirm<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Fine-Pitch SMT Pads<\/td><td>ENIG provides a flat solderable surface for fine-pitch and assembly-sensitive components.<\/td><td>Confirm pad dimensions, component package, stencil requirements and assembly process.<\/td><\/tr>\n<tr><td>Storage Before Assembly<\/td><td>The nickel-gold surface protects exposed copper during normal storage and handling.<\/td><td>Confirm expected storage period, packaging method and solderability acceptance criteria.<\/td><\/tr>\n<tr><td>Communication Module Reliability<\/td><td>Consistent pad condition supports repeatable solder joints on connectors and SMT components.<\/td><td>Confirm connector loads, test-point use, assembly stress and final test requirements.<\/td><\/tr>\n<tr><td>Cost vs Need<\/td><td>ENIG costs more than OSP or HASL-LF but is useful where flatness, storage or exposed contacts justify it.<\/td><td>Select the finish according to component pitch, storage, application and total assembly risk.<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"design-review\">\n<div class=\"container\">\n<div class=\"section-head\">\n<div class=\"eyebrow\">DFM Review<\/div>\n<h2>Communication PCB Design Review<\/h2>\n<p>Before production, the manufacturing data is checked for stack-up consistency, return-path continuity, via definitions, connector geometry, component clearances, panelization and test access.<\/p>\n<\/div>\n<div class=\"grid-4\">\n<article class=\"card\"><div class=\"icon\">S<\/div><h3>Stack-Up<\/h3><p>Layer order, copper distribution, dielectric spacing and ground\/power allocation must match the electrical function and finished board thickness.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">G<\/div><h3>Ground Return<\/h3><p>Ground reference continuity and return paths should be maintained around communication signals, clock lines and interface circuits.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">V<\/div><h3>Via Design<\/h3><p>Via diameter, finished hole size, annular ring, PTH\/NPTH designation and drill tolerance directly affect manufacturability and reliability.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">C<\/div><h3>Connector Area<\/h3><p>Connector pads, plated holes, insertion loads, edge clearance and mechanical alignment must match the mating hardware.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">I<\/div><h3>Impedance Review<\/h3><p>For controlled-impedance traces, provide target values, controlled layers, reference planes, trace geometry and tolerance requirements.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">B<\/div><h3>BGA \/ QFN<\/h3><p>For BGA and QFN packages, provide the package data, land pattern, thermal-pad requirements, inspection criteria and rework restrictions.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">T<\/div><h3>Test Points<\/h3><p>Include ICT, FCT, programming or maintenance access requirements before panelization and fixture planning.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">P<\/div><h3>Panelization<\/h3><p>Specify CNC routing, V-Cut, tooling holes, fiducials, breakaway tabs and packing requirements for repeat production.<\/p><\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"process\">\n<div class=\"container split\">\n<div>\n<div class=\"section-head\">\n<div class=\"eyebrow\">Manufacturing<\/div>\n<h2>Manufacturing Flow<\/h2>\n<p>Production proceeds from file verification and material preparation through inner-layer processing, lamination, drilling, plating, ENIG finishing, inspection and packing.<\/p>\n<\/div>\n<div class=\"timeline\">\n<div class=\"step\"><div class=\"step-num\">01<\/div><div><h3>File and Stack-Up Review<\/h3><p>Gerber, drill data, layer order, board thickness, copper weight, ENIG specification and panel requirements are verified before production tooling.<\/p><\/div><\/div>\n<div class=\"step\"><div class=\"step-num\">02<\/div><div><h3>FR4 Material Preparation<\/h3><p>FR4 laminate, prepreg and copper foil are selected according to the approved stack-up and finished thickness.<\/p><\/div><\/div>\n<div class=\"step\"><div class=\"step-num\">03<\/div><div><h3>Inner Layer Imaging and Etching<\/h3><p>Inner-layer circuits are imaged, etched and inspected before the layers are prepared for lamination.<\/p><\/div><\/div>\n<div class=\"step\"><div class=\"step-num\">04<\/div><div><h3>Lamination and Drilling<\/h3><p>The multilayer structure is laminated before vias, plated through holes and mechanical holes are drilled to the approved data.<\/p><\/div><\/div>\n<div class=\"step\"><div class=\"step-num\">05<\/div><div><h3>Outer Layer Imaging and Plating<\/h3><p>Outer-layer circuits are formed and plated through holes create electrical connections between the four copper layers.<\/p><\/div><\/div>\n<div class=\"step\"><div class=\"step-num\">06<\/div><div><h3>Solder Mask, Silkscreen and ENIG<\/h3><p>LPI solder mask, legend and ENIG finish are applied according to the approved color, pad and marking requirements.<\/p><\/div><\/div>\n<div class=\"step\"><div class=\"step-num\">07<\/div><div><h3>Routing, Testing and Packing<\/h3><p>Finished boards undergo routing, dimensional inspection, AOI, electrical testing, quantity verification and protective packing before dispatch.<\/p><\/div><\/div>\n<\/div>\n<\/div>\n<div class=\"card\">\n<div class=\"mini-label\">Process Control Focus<\/div>\n<h2 style=\"margin-top:8px\">What Buyers Should Confirm<\/h2>\n<div class=\"check-list\">\n<div class=\"check\"><b>\u2713<\/b><div><strong>Layer and Drill Consistency<\/strong><span>Layer naming, drill files and board outline should be consistent across all files.<\/span><\/div><\/div>\n<div class=\"check\"><b>\u2713<\/b><div><strong>ENIG Areas<\/strong><span>Pad areas, connector pads and test points should be checked for final finish requirements.<\/span><\/div><\/div>\n<div class=\"check\"><b>\u2713<\/b><div><strong>Communication Signal Areas<\/strong><span>Signal routing, ground reference and sensitive areas should be reviewed if performance requirements are specified.<\/span><\/div><\/div>\n<div class=\"check\"><b>\u2713<\/b><div><strong>Assembly Requirements<\/strong><span>BOM, component placement, BGA\/QFN areas and test fixtures should be discussed before PCBA quotation.<\/span><\/div><\/div>\n<\/div>\n<div class=\"note\">Include target impedance values, controlled layers, reference planes, trace geometry and tolerance when the design contains controlled-impedance, RF or other signal-sensitive circuits.<\/div>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"quality\">\n<div class=\"container\">\n<div class=\"section-head center\">\n<div class=\"eyebrow\">Quality Control<\/div>\n<h2>Pre-Shipment Checks<\/h2>\n<p>Pre-shipment inspection covers laminate and stack-up consistency, layer registration, plated-hole continuity, ENIG pad condition, circuit integrity, dimensions and packing.<\/p>\n<\/div>\n<div class=\"grid-3\">\n<article class=\"card\"><div class=\"icon\">M<\/div><h3>Material Check<\/h3><p>FR4 laminate, prepreg, copper foil and process materials are matched to the approved order specification.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">L<\/div><h3>Layer Registration<\/h3><p>Inner and outer layers are checked for registration, drill alignment and finished-hole conformity during production.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">A<\/div><h3>AOI Inspection<\/h3><p>AOI detects open circuits, shorts, missing features, over-etching, under-etching and other pattern defects.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">E<\/div><h3>ENIG Finish Check<\/h3><p>ENIG pads are checked for coverage, appearance, cleanliness and suitability for the specified soldering process.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">T<\/div><h3>Electrical Testing<\/h3><p>Electrical testing verifies continuity and isolation against the supplied net data before shipment.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">P<\/div><h3>Packing Review<\/h3><p>Final inspection verifies dimensions, quantity, labels, packing method and shipment instructions.<\/p><\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"pcba\">\n<div class=\"container\">\n<div class=\"section-head\">\n<div class=\"eyebrow\">PCB + PCBA<\/div>\n<h2>Assembly Support<\/h2>\n<p>YC PCB can supply bare communication PCBs or complete PCBAs. Assembly quotations can cover component sourcing, SMT, THT, BGA\/QFN processing, programming, functional testing and final packing.<\/p>\n<\/div>\n<div class=\"grid-4\">\n<article class=\"card\"><div class=\"icon\">SMT<\/div><h3>SMT Assembly<\/h3><p>SMT assembly covers passive components, ICs, communication devices, connectors and other surface-mount parts.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">BGA<\/div><h3>BGA \/ QFN Review<\/h3><p>BGA and QFN assembly can include stencil review, placement control, X-Ray inspection and agreed rework criteria.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">THT<\/div><h3>THT Components<\/h3><p>THT assembly supports connectors, terminal blocks, pin headers and other <a href=\"\/pcb-assembly\/\" style=\"font-weight:bold;color:var(--e-global-color-primary,#0058e6);text-decoration:underline;\">through-hole<\/a> components.<\/p><\/article>\n<article class=\"card\"><div class=\"icon\">FCT<\/div><h3>Functional Test<\/h3><p>Testing can include ICT, FCT, programming and custom fixtures according to the product test specification.<\/p><\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"selection\">\n<div class=\"container\">\n<div class=\"section-head center\">\n<div class=\"eyebrow\">Material Route<\/div>\n<h2>4 Layer vs Other Routes<\/h2>\n<p>Choose the board structure according to routing density, signal performance, component pitch, connector count, assembly method and budget. Four-layer FR4 with ENIG is suitable when internal planes and flat solderable pads are required without moving to HDI or special RF materials.<\/p>\n<\/div>\n<div class=\"table-wrap\">\n<table class=\"comparison\">\n<thead><tr><th>PCB Route<\/th><th>Better For<\/th><th>Buyer Decision<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>4 Layer FR4 PCB with ENIG<\/td><td>Communication modules, gateways, control interfaces, SMT pads and medium routing density.<\/td><td>Choose when FR4 material, 4 layer routing and ENIG finish match the electrical and assembly needs.<\/td><\/tr>\n<tr><td>2 Layer FR4 PCB<\/td><td>Cost-controlled control boards, driver boards and less dense routing.<\/td><td>Choose when the circuit is simple and routing density does not require internal planes.<\/td><\/tr>\n<tr><td>HDI PCB<\/td><td>Very dense communication modules, microvias or compact fine-pitch layouts.<\/td><td>Choose when standard 4 layer routing cannot fit the design.<\/td><\/tr>\n<tr><td>High-Frequency PCB<\/td><td>RF, microwave or signal-sensitive designs where FR4 loss may not be suitable.<\/td><td>Choose when the electrical requirement needs special high-frequency material.<\/td><\/tr>\n<tr><td>PCBA Route<\/td><td>Complete communication modules that require assembly and testing.<\/td><td>Choose when PCB fabrication, BOM, SMT\/THT and test route should be quoted together.<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"reference\">\n<div class=\"container\">\n<div class=\"section-head\">\n<div class=\"eyebrow\">Project Reference<\/div>\n<h2>Common Project Routes<\/h2>\n<p>The examples below show common supply configurations for communication projects. Pricing and lead time are based on the submitted files, quantity, material, finish, assembly scope and testing requirements.<\/p>\n<\/div>\n<div class=\"grid-3\">\n<article class=\"card\"><div class=\"mini-label\">Route A<\/div><h3>Gateway Control Board<\/h3><p>Four-layer FR4 with ENIG for gateway interfaces, with connectors, ground reference, SMT pads and electrical testing defined in the order.<\/p><div class=\"pill-list\"><span>ENIG<\/span><span>SMT<\/span><span>E-Test<\/span><\/div><\/article>\n<article class=\"card\"><div class=\"mini-label\">Route B<\/div><h3>Network Module PCB<\/h3><p>Four-layer FR4 for network-module routing, with layer order, via design, signal routing and panelization confirmed before production.<\/p><div class=\"pill-list\"><span>4 Layer<\/span><span>Stack-Up<\/span><span>DFM<\/span><\/div><\/article>\n<article class=\"card\"><div class=\"mini-label\">Route C<\/div><h3>Communication PCBA<\/h3><p>PCB fabrication plus SMT assembly for communication control modules, including BOM review, BGA\/QFN inspection requirements and functional testing.<\/p><div class=\"pill-list\"><span>PCBA<\/span><span>BOM<\/span><span>FCT<\/span><\/div><\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"quote\">\n<div class=\"container split\">\n<div>\n<div class=\"section-head\">\n<div class=\"eyebrow\">RFQ Checklist<\/div>\n<h2>Send These Details<\/h2>\n<p>A complete RFQ allows material, stack-up, ENIG finish, testing, price and lead time to be confirmed without repeated technical clarification.<\/p>\n<\/div>\n<div class=\"quote-grid\">\n<div class=\"quote-item\">Gerber files<\/div>\n<div class=\"quote-item\">Excellon drill file<\/div>\n<div class=\"quote-item\">Stack-up requirement<\/div>\n<div class=\"quote-item\">Board size and outline<\/div>\n<div class=\"quote-item\">4 layer FR4 route<\/div>\n<div class=\"quote-item\">Board thickness<\/div>\n<div class=\"quote-item\">Copper weight<\/div>\n<div class=\"quote-item\">ENIG requirement<\/div>\n<div class=\"quote-item\">Solder mask color<\/div>\n<div class=\"quote-item\">Quantity<\/div>\n<div class=\"quote-item\">Target lead time<\/div>\n<div class=\"quote-item\">Shipping country<\/div>\n<div class=\"quote-item\">BOM if PCBA is needed<\/div>\n<div class=\"quote-item\">Pick-and-place file<\/div>\n<div class=\"quote-item\">Testing requirement<\/div>\n<\/div>\n<\/div>\n<div class=\"card\">\n<div class=\"mini-label\">Faster Engineering Review<\/div>\n<h2 style=\"margin-top:8px\">What Helps the Quote<\/h2>\n<div class=\"spec-grid\" style=\"margin-top:20px\">\n<div class=\"spec-card\"><span class=\"mini-label\">Stack-Up<\/span><h3>Layer Requirement<\/h3><p>Provide the required layer order, finished thickness, dielectric spacing and impedance targets when these values are controlled by the design.<\/p><\/div>\n<div class=\"spec-card\"><span class=\"mini-label\">Assembly<\/span><h3>BOM + Placement<\/h3><p>For PCBA, include the BOM, centroid file, assembly drawing, approved substitutions and testing instructions.<\/p><\/div>\n<div class=\"spec-card\"><span class=\"mini-label\">Finish<\/span><h3>ENIG Need<\/h3><p>State whether ENIG is required on every exposed copper pad or only on specified contact areas.<\/p><\/div>\n<div class=\"spec-card\"><span class=\"mini-label\">Testing<\/span><h3>ICT \/ FCT<\/h3><p>Specify ICT, FCT, programming, fixture, inspection-report and acceptance requirements in the RFQ.<\/p><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\" id=\"faq\">\n<div class=\"container\">\n<div class=\"section-head center\">\n<div class=\"eyebrow\">FAQ<\/div>\n<h2>Communication FR4 PCB FAQ<\/h2>\n<p>The following answers cover the main purchasing, engineering and assembly questions for this communication-series 4 layer FR4 PCB.<\/p>\n<\/div>\n<div class=\"faq\">\n<details open=\"\"><summary>What is a communication series 4 layer FR4 PCB with ENIG?<\/summary><p>It is a four-layer rigid FR4 circuit board with ENIG finish, intended for communication modules, network electronics, industrial gateways and control interfaces that require internal ground\/power planning and reliable SMT pads.<\/p><\/details>\n<details><summary>When should I choose 4 layer FR4 instead of 2 layer FR4?<\/summary><p>Choose four layers when the design needs greater routing density, dedicated ground or power planes, more stable return paths or a compact layout that cannot be routed reliably on two layers.<\/p><\/details>\n<details><summary>Why is ENIG used on this FR4 PCB?<\/summary><p>ENIG provides flat component pads, good solderability and protection against surface oxidation, making it suitable for fine-pitch components and boards stored before assembly.<\/p><\/details>\n<details><summary>Can YC PCB review impedance requirements?<\/summary><p>Yes. Provide the target impedance, controlled layers, reference planes, trace width and spacing, tolerance and stack-up requirements with the Gerber files.<\/p><\/details>\n<details><summary>Is FR4 suitable for all communication PCBs?<\/summary><p>FR4 is suitable for many control and interface boards. RF, microwave and higher-speed low-loss applications may require a different laminate or a specially controlled stack-up.<\/p><\/details>\n<details><summary>Can this board be assembled by YC PCB?<\/summary><p>Yes. SMT, THT and mixed assembly can be quoted with component sourcing, inspection and testing when complete BOM and assembly files are supplied.<\/p><\/details>\n<details><summary>Can you support BGA or QFN assembly on this 4 layer board?<\/summary><p>Yes. BGA, QFN and fine-pitch packages can be assessed from the land pattern, package data, stencil requirements, X-Ray criteria and test plan.<\/p><\/details>\n<details><summary>What files are needed for quotation?<\/summary><p>Send Gerber RS-274X, Excellon drill data, stack-up requirements, finished thickness, copper weight, solder-mask color, ENIG specification, quantity and requested delivery date. Add BOM and assembly files for PCBA.<\/p><\/details>\n<details><summary>How is the stack-up confirmed?<\/summary><p>The final stack-up is confirmed from the Gerber files, finished thickness, copper weight, electrical requirements, controlled-impedance notes and available laminate construction.<\/p><\/details>\n<details><summary>What tests are available before shipment?<\/summary><p>Available checks include AOI, electrical continuity\/isolation testing, ENIG surface inspection, dimensional inspection, final visual inspection and packing verification.<\/p><\/details>\n<details><summary>Can I order prototypes or small batches?<\/summary><p>Yes. Prototype, small-batch and repeat-production orders are supported. Material availability, process complexity and quantity determine the confirmed lead time.<\/p><\/details>\n<details><summary>Can you provide PCBA testing support?<\/summary><p>ICT, FCT, programming and custom fixture support can be quoted from the test specification, BOM and assembled product requirements.<\/p><\/details>\n<details><summary>What is the difference between this page and the FR4 PCB category page?<\/summary><p>The category page covers the wider FR4 PCB range; this product route is specifically for four-layer communication boards using ENIG finish, internal-layer planning and optional assembly.<\/p><\/details>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section\" id=\"related\">\n<div class=\"container\">\n<div class=\"section-head\">\n<div class=\"eyebrow\">Related Products<\/div>\n<h2>Related FR4 PCB Routes<\/h2>\n<p>Compare this four-layer communication PCB with other FR4 constructions according to routing density, power and ground requirements, assembly process and application.<\/p>\n<\/div>\n<div class=\"grid-3\">\n<article class=\"related-card\"><span class=\"mini-label\">FR4 Category<\/span><strong>FR4 PCB<\/strong><p>General FR4 material and rigid-board options for buyers evaluating layer count, construction and application requirements.<\/p><a href=\"\/products\/fr4-pcb\/\">View FR4 PCB Category<\/a><\/article>\n<article class=\"related-card\"><span class=\"mini-label\">Low-Power Lighting<\/span><strong>Single Layer LED Strip Light FR4 PCB<\/strong><p>Single-layer FR4 boards for simple LED-strip and low-power lighting circuits.<\/p><a href=\"\/products\/fr4-pcb\/single-layer-led-strip-light-fr4-pcb\/\">View LED FR4 PCB<\/a><\/article>\n<article class=\"related-card\"><span class=\"mini-label\">Industrial Control<\/span><strong>Industrial Control Double Layer FR4 PCB<\/strong><p>Two-layer FR4 boards for PLC, driver, sensor, relay and industrial control applications.<\/p><a href=\"\/products\/fr4-pcb\/industrial-control-double-layer-fr4-pcb\/\">View Industrial FR4 PCB<\/a><\/article>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section alt\">\n<div class=\"container\">\n<div class=\"cta-band\">\n<div class=\"eyebrow\">Get Quotation<\/div>\n<h2 style=\"color: #ffffff;\">Send Your 4 Layer FR4 PCB Files<\/h2>\n<p>Send Gerber and drill files, stack-up requirements, finished thickness, copper weight, ENIG specification, quantity and assembly files when required. YC PCB will confirm manufacturability, production scope, price and delivery schedule from the submitted data.<\/p>\n<div class=\"btns\">\n<a class=\"btn primary\" href=\"https:\/\/wa.me\/8613827881651\" target=\"_blank\" rel=\"noopener\">Send Gerber for DFM Review<\/a>\n<a class=\"btn secondary\" href=\"#quote\">Check RFQ List<\/a>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/main>\n\n<!-- YC PCB Contact Popup -->\n<div class=\"ycpcbs-contact-popup\" id=\"ycpcbs-contact-popup\">\n  <div\n    class=\"ycpcbs-popup-dialog\"\n    role=\"dialog\"\n    aria-modal=\"true\"\n    aria-labelledby=\"ycpcbs-popup-title\"\n  >\n    <a class=\"ycpcbs-popup-close\" href=\"#\" aria-label=\"Close contact form\">\u00d7<\/a>\n\n    <div class=\"ycpcbs-popup-head\">\n      <div class=\"eyebrow\">Quick Project Inquiry<\/div>\n\n      <h3 id=\"ycpcbs-popup-title\">Send Your 4 Layer FR4 PCB Requirements<\/h3>\n\n      <p>\n        Tell us what you need. 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