DFM Checklist: 6 Steps to a Mass-Producible BOM
What our Shenzhen engineers check before a design ever reaches the SMT line — and the mistakes we see weekly.
Most of the costly surprises in a new product launch are not component failures — they are small omissions in the design package discovered in the first 24 hours at the factory. After nine SMT lines and a network of board factories that has been running since 2001, the checklist below is the one we send back to every first-time customer. Fix these six items before you send anything to Shenzhen and your prototype quote starts at 24 hours, not two weeks.
| STEP | WHAT TO CHECK | WHY IT MATTERS |
|---|---|---|
| 1 | Release package: Gerber + EDA source files, one version label | A mixed-version package is the single most common cause of a wrong prototype build |
| 2 | Netlist matches the BOM footprint layer | One misplaced pin assignment silently produces a non-functional first article |
| 3 | Component availability: 0 stock = red flag BEFORE prototype | A 1–2 week lead-time part on a mass-run BOM can hold 30,000 boards |
| 4 | Test points for ICT/FCT plan | Without test points, functional test coverage drops and debugging cost triples |
| 5 | Fiducials + solder paste apertures documented | AOI/SPI operators need them defined; undefined = guessing |
| 6 | Revision history and ECN ownership stated | One change owner prevents two teams editing the same BOM |
The three mistakes we fix free of charge
Filing a free DFM review is a two-line email: send your files to sales@ems-trade.com and we return the filled checklist within 48 hours — alongside a capacity and export plan for the platform. Our engineers answer within 4 business hours on standard scopes.
Ready for the next step?
From this checklist to a first article, the route is design guides → board fabrication → assembly.
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