Purchased component
Printed Circuit Board (bare board)
✓ Expert reviewed All content on this page has been reviewed by a senior motor engineer.
Process flow
Upstream manufacturing of this bought-in item is not covered yet; see the incoming inspection and approval tests.
Incoming inspection & approval tests
- Visual and dimensionalIPC-A-600
- Thermal stress (solder float)IPC-TM-650 2.6.8
- SolderabilityIPC J-STD-003
- Ionic contamination and insulation resistanceIPC-TM-650
Buyer FAQ
- What PCB specification suits a motor driver board?
- FR-4 with Tg ≥ 150 °C, 2–4 layers, and 2 oz (70 µm) copper on power layers to carry phase current and spread heat. Hall boards can use thinner 1 oz copper.
- Which surface finish?
- ENIG for fine-pitch parts and flat pads, lead-free HASL for low cost, OSP for simple boards with short storage. Choose with the assembler and reflow profile in mind.
- What should come with each lot?
- Electrical test (flying probe or fixture) results, a micro-section report, UL file number for the laminate and board, and impedance reports if controlled impedance is specified.