Why “Not independently checked” is the most honest label in a PCB directory ↗
Understand what PCB supplier verification does—and does not—prove. Check UL ownership, equipment evidence and material traceability before your RFQ.
PCB DESK NOTES
The questions behind the board.
PCB Desk Notes: practical field notes on supplier evidence, manufacturing limits and the decisions behind a reliable RFQ.
How to read a PCB capability matrix without being misled by combined limits ↗
A PCB capability matrix is a shortlist, not a build approval. Learn how copper, holes, stackup and impedance affect combined manufacturing limits.
Read a PCB capability table without combining incompatible limits ↗
A practical worksheet for separating production limits, process conditions and board-specific acceptance.
A UL number is a starting point, not a factory identity check ↗
Record the certification source, legal holder and applicable product scope before treating a supplier claim as checked.
Specify the laminate grade, then ask for batch traceability ↗
A brand name is not enough to define a PCB material or prove which laminate entered production.
Prepare an RFQ that an engineer can qualify ↗
A concise manufacturing brief that makes technical gaps and quotation differences visible.