PCB & PCBA Frequently Asked Questions
A centralized engineering knowledge base addressing common questions across PCB manufacturing, PCBA assembly, materials, processes, and reliability-driven design decisions.
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High-Speed PCB
At what speed should I start treating my board as a “high-speed PCB”?
There is no single universal threshold, but in practice, once the signal rise time enters the sub-nanosecond range and interconnect length becomes a significant fraction of the signal wavelength, the traces must be treated as transmission lines. In real-world designs, you should follow high-speed design rules starting from clock frequencies in the hundreds of MHz range or serial links in the multi-Gbps range.
Can you help me select suitable materials for high-speed PCBs?
Yes. Simply share your target data rate, maximum trace length, operating temperature range and cost constraints. Our engineers can then recommend suitable FR-4 or low-loss materials and propose hybrid stackup options tailored to your specific application.
How do you verify that the impedance of mass-produced PCBs meets the specification?
For every production panel we fabricate impedance coupons and measure them using TDR (Time Domain Reflectometry). These coupons replicate your exact stackup and trace geometry, providing direct evidence that the manufactured boards match the design assumptions. The TDR results can be compiled into a test report for your records.
For high-speed designs, do you support back-drilling and via-in-pad technologies?
Yes. We support back-drilling to remove via stubs, and via-in-pad with resin-plugged vias to optimize BGA fan-out and high-speed signal integrity. Design rules such as minimum drill size, pad diameter and keep-out areas will be provided to you during the DFM review stage.
Can you review my high-speed PCB design before tape-out?
Yes. If you send us your Gerber/CAD/ODB++ files together with the target interfaces (PCIe, Ethernet, DDR, SerDes, etc.), key constraints (impedance targets, stackup concept, maximum loss budget) and any existing SI guidelines, our engineering team can perform a focused DFM/DFX review. We will highlight potential issues such as via stubs, reference plane splits, return path disruptions or manufacturability risks and suggest layout adjustments before you finalize the design.
What high-speed related manufacturing tolerances can you typically achieve?
For controlled-impedance high-speed boards, we typically achieve impedance tolerance in the range of ±5% (and tighter on request after joint evaluation), layer-to-layer registration suitable for fine-pitch BGAs, and tightly controlled drill and plating tolerances for microvias and back-drilled holes. The exact capability window depends on board thickness, layer count, material set and stackup configuration, and we define these limits clearly during the engineering and quotation phase so your layout rules match our real process window.
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World-class PCB & PCBA manufacturer focused on high-frequency and high-reliability boards for defense, aerospace, automotive and industrial electronics.
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