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4-Layer Router PCB
High-performance 4-layer PCBs for network routers with Gigabit Ethernet, Wi-Fi 6/6E, and multi-port switching. Controlled impedance, EMI shielding, and cost-effective manufacturing for consumer and enterprise networking.
Network routers are the backbone of modern connectivity, requiring PCBs that can handle high-speed Ethernet switching, wireless communication, and processor interfaces with clean signal integrity. At Season Multilayer Circuit, we manufacture 4-layer router PCBs with controlled impedance, EMI shielding, and optimized cost-efficiency for consumer and enterprise networking applications.
4
Layer Count
5/5 mil
Min. Trace/Space
0.20 mm
Min. Via Diameter
Tg 170
Glass Transition Temp
1-2 u”
ENIG Gold Thickness
ISO9001
ISO14001
UL (E305905)
IPC-Class 2/3
RoHS
4-Layer Router PCB Stackup Diagram
Our 4-layer router PCB stackup is the industry-standard configuration for network router applications, providing dedicated signal routing layers with ground and power plane shielding for Gigabit Ethernet, Wi-Fi, and processor interfaces.
- Top Layer (Copper/Plated): Component placement, Ethernet PHY, Wi-Fi module, SoC
- Inner Layer 2 (Ground Plane): Solid ground reference for top-side signal integrity and EMI shielding
- Inner Layer 3 (Power Plane): Power distribution (3.3V/5V/12V) with decoupling support
- Bot Layer (Copper/Plated): Bottom routing, Ethernet transformer coupling, test points
The 4-layer stackup is the optimal balance of performance and cost for router applications. The solid ground plane (L2) provides excellent signal reference for high-speed Ethernet and Wi-Fi traces, while the power plane (L3) ensures clean power distribution. For routers with advanced features like Wi-Fi 6E/7, multi-gigabit Ethernet, or PoE, the 4-layer board may incorporate special features: resin-plugged vias for planar surface under BGA packages, controlled-impedance routing for high-speed Ethernet traces, and thick copper for power delivery.
Technical Capability & Specifications
| Parameter | Specification | Advanced Capabilities |
| Layer Count | 4 Layer | 2-32L (Mass); 2-64L (Sample) |
| Base Material | FR-4 S1000-2M Tg170 | SY, NY, TUC, ZY, EMC, KB, ITEQ, Rogers, Megtron, Nelco, Isola |
| Board Thickness | 1.6mm | 0.2-6.4mm (Mass); 0.15-20mm (Sample) |
| Panel Size | 160x120mm/1 | 800x600mm (Mass); 1050×610 (Sample) |
| Copper Thickness | Outer: 1 OZ Inner: 1 OZ | Outer: 1/3-12 OZ Inner: 1/4-12 OZ |
| Min Drill Size | 0.20mm | 0.15mm (Sample) |
| Min Trace Width/Spacing | 5/5 mil | 4/4 mil (Sample) |
| Surface Finish | ENIG | HASL, OSP, Immersion Silver, Immersion Tin, ENIG |
| Solder Mask | Green | Green, Black, Blue, Red, Yellow, White, Purple |
| Impedance Control | 50/100 Ohm +/-10% | +/-8% available for Gigabit Ethernet |
| Controlled Dielectric | Available | Tolerance: +/-0.05mm on dielectric thickness |
| Panel Size | Standard: 160x120mm | Custom panelization available |
Key Advantages of Our Router PCB
- Optimized 4-Layer Architecture: Industry-standard signal-ground-power-signal stackup provides excellent signal integrity for Gigabit Ethernet and Wi-Fi applications at the most cost-effective layer count.
- Controlled Impedance for Ethernet: 100 ohm differential impedance control for Gigabit Ethernet pairs ensures reliable high-speed data transmission with minimal bit errors and retransmissions.
- EMI Shielding for Wi-Fi: Solid ground plane (L2) provides effective EMI shielding for Wi-Fi antenna feed lines and RF circuits, preventing interference between wireless and wired network sections.
- Cost-Effective Manufacturing: 4-layer construction with standard materials and processes provides the best price-to-performance ratio for volume router production, enabling competitive product pricing.
- Thermal Management for SoC: 1 OZ inner copper power plane acts as a thermal spreader under the router SoC, distributing heat without requiring additional thermal solutions for typical consumer router power levels.
Overcoming Critical Challenges in Router PCB Design
When sourcing PCBs for network router applications, engineers encounter three key challenges. Here is how our engineering team eliminates them:
1. Gigabit Ethernet Signal Integrity
The Problem: Gigabit Ethernet operates at 125 MHz with strict jitter and eye-diagram requirements. Poor PCB layout with improper impedance control, insufficient ground reference, or long stub traces causes signal degradation, packet loss, and reduced throughput.
Our Solution: Our 4-layer stackup routes all Gigabit Ethernet differential pairs on the top layer (L1) with the solid ground plane (L2) as reference. We maintain 100 ohm differential impedance (+/-10%) through controlled trace geometry and dielectric thickness. Short, direct routes from PHY to magnetics minimize insertion loss and reflections.
2. EMI Interference Between Wi-Fi and Ethernet
The Problem: Routers combine Wi-Fi RF circuits and Gigabit Ethernet on the same board. Without proper isolation, Wi-Fi transmissions couple into Ethernet traces (and vice versa), causing data corruption and regulatory compliance failures.
Our Solution: The solid ground plane (L2) creates a physical shield between the top-side RF/Ethernet section and the bottom-side routing. We recommend physical separation of Wi-Fi and Ethernet sections on the top layer, with grounded copper pour acting as a Faraday shield between them. This achieves >30dB isolation between Wi-Fi and Ethernet circuits.
3. Cost Optimization for Volume Production
The Problem: Consumer routers are price-sensitive products. Over-specifying the PCB (excess layers, premium materials, tight tolerances) increases cost beyond competitive levels. Under-specifying causes performance issues and returns.
Our Solution: Our engineering team works with you to optimize the 4-layer stackup for your specific router design. We identify the minimum required specifications (copper weight, impedance tolerance, material grade) that meet your performance requirements. Standard panel sizes and processes minimize manufacturing cost. The result: optimal price-performance ratio for volume production.
Where Our Router PCBs Are Used
Our 4-layer router PCBs power a wide range of networking applications:
- Home Wi-Fi Routers: Dual-band and tri-band Wi-Fi 6/6E routers with Gigabit Ethernet WAN/LAN ports for residential broadband.
- Mesh Router Nodes: Mesh Wi-Fi system nodes with dedicated backhaul radio and Ethernet backhaul option for whole-home coverage.
- Enterprise Edge Routers: Multi-port enterprise routers with VLAN support, QoS, and VPN capability for SMB networks.
- 4G/5G CPE Routers: Cellular broadband routers combining 4G/5G modems with Wi-Fi and Ethernet for fixed wireless access.
- IoT Gateway Routers: Industrial IoT gateways combining Ethernet, Wi-Fi, Zigbee, and BLE for smart building and factory applications.
Our Quality Guarantee for Router PCBs
Network router electronics require consistent signal quality and reliability. We implement rigorous testing protocols on every board:
- 100% AOI Inspection: Automated Optical Inspection scans every layer for trace breaks, shorts, and alignment errors.
- 100% Electrical Testing (E-Test): Flying probe or fixture-based testing verifies continuity and isolation.
- Controlled Impedance Testing: Polar Instruments test report documenting 50/100 ohm compliance for Ethernet and RF signals.
- Solder Mask Inspection: Visual and automated inspection of solder mask coverage on impedance-controlled traces.
- Certifications: ISO9001:2015, ISO14001, UL (E305905), RoHS compliant. IPC-Class 2 standard, Class 3 available.
Why Choose Season PCB for Your Router PCB?
With nearly 20 years of experience in PCB manufacturing, Season Multilayer Circuit has served over 8,000 global clients in networking, consumer electronics, and telecommunications. Our three manufacturing facilities provide capacity for both rapid prototyping and high-volume production.
We understand that router PCBs require a balance of signal integrity, EMI shielding, and cost efficiency. That is why every 4-layer router PCB we ship is backed by:
- Free DFM file checking before production
- 24/7 dedicated engineering support
- Guaranteed on-time delivery
- No minimum order quantity — from 1 prototype to 100,000+ units
- Engineering fee waivers on bulk production orders
Season PCB specializes in 4-layer router PCB manufacturing for Wi-Fi routers, mesh systems, and enterprise networking. Our router PCB products feature controlled impedance for Gigabit Ethernet, EMI shielding for Wi-Fi coexistence, and cost-optimized manufacturing. Each router PCB meets IPC standards.
For your router PCB needs, Season PCB provides fast turnaround, competitive pricing, and ISO-certified quality. Contact us for router PCB manufacturing today.
Our router PCB boards comply with UL safety certifications and IPC manufacturing standards. Each router PCB undergoes signal integrity testing and EMI verification.
Frequently Asked Questions
Q1: Is 4 layers enough for Wi-Fi 6E routers?
A: For most consumer Wi-Fi 6E routers, 4 layers is sufficient. The solid ground plane (L2) provides adequate EMI shielding for Wi-Fi 6E (6 GHz band) and Gigabit Ethernet signals. However, for routers with Wi-Fi 7 (320 MHz channels, 4K-QAM), multi-gigabit Ethernet (2.5G/10G), or complex PoE, we recommend upgrading to 6 layers for additional signal routing and isolation.
Q2: What impedance tolerance do you offer for Gigabit Ethernet?
A: Standard impedance control tolerance is +/-10% for 100 ohm differential pairs on 4-layer boards. For critical Gigabit Ethernet applications, we can achieve +/-8% with tighter control on trace geometry and dielectric thickness. Every batch includes a Polar Instruments impedance test report.
Q3: What is the typical lead time for 4-layer router PCB prototypes?
A: Standard 4-layer prototype lead time is 5-7 working days. Expedited 48-hour service is available. Mass production typically takes 10-15 working days depending on order volume. Our 96-hour expedited prototyping service supports rapid development cycles for competitive networking products.
Ready to start your Router PCB project?
Whether you need 5 pieces for prototyping or 100,000 for mass production, our engineering team is ready to support your router project with DFM review, impedance modeling, and fast-turn fabrication.