Prototyping in China can be fast and cost-effective — or frustrating, if a missing file or an unclear spec stalls your build. This guide covers what a Shenzhen assembler actually needs from you and what realistic lead times look like, so your first prototype run goes smoothly.
The Files You Need
Almost every avoidable delay comes down to incomplete data. For a prototype PCBA quote and build, prepare:
- Gerber or ODB++ — the board layout and copper layers.
- BOM (Bill of Materials) — every part with manufacturer part numbers and quantities; flag any allowed alternates.
- Pick-and-place / centroid (CPL) — component positions and rotations for SMT placement.
Optional but helpful: assembly notes, a board photo or 3D render, and any special handling such as moisture-sensitive parts. If you are unsure what to send, our guide on the files required for a PCBA quote walks through it.
Realistic Lead Times
For a straightforward prototype, PCBA typically ships in 3–5 working days once files and parts are confirmed. Two factors most affect the timeline:
- Component availability — hard-to-find parts can dominate lead time, so identify long-lead items early.
- File completeness — a clean BOM and CPL avoids a round of clarification questions.
A DFM review up front prevents re-spins later, which is where real delays come from.
Turnkey vs. Consignment for Prototypes
For a first prototype, turnkey (the assembler sources everything) is usually simplest — you send files and receive a tested board. If you already have parts on hand, consignment works too. BELI supports both through its PCB assembly service.
What to Look For in a Shenzhen Assembler
- Fine-pitch capability if your design uses modern parts — placement down to 0201/01005 and 0.4 mm-pitch BGAs at ±0.03 mm accuracy.
- Real inspection: AOI and X-ray for hidden BGA/QFN joints, plus ICT or functional test.
- Quality systems: ISO 9001:2015 (and ISO 13485:2016 if you are in medical), plus RoHS and REACH compliance.
Getting Started with BELI
BELI Technologies runs prototype and volume PCBA in Shenzhen with no MOQ for prototypes, AOI/X-ray/ICT on every order, and a ≥99.5% first-pass yield. Send your Gerber, BOM, and CPL to get a free prototype quote — 24-hour response.