Pick-and-Place in China SMT Assembly
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Pick-and-place is the stage where high-speed machines mount SMD components onto solder-paste-printed boards before reflow, and its accuracy sets the quality ceiling for any China-sourced PCBA. Modern lines from suppliers like Yamaha, Fuji, and JUKI place 0201 and even 01005 parts at tens of thousands of components per hour, but placement offset and feeder calibration are where defects creep in. Auditing a Chinese factory means checking machine vintage, nozzle condition, and post-placement AOI.
When you evaluate an SMT line, ask what placement machines run your job and whether fine-pitch and BGA parts are within their accuracy spec. The common pitfall is a factory subcontracting fine-pitch placement to an older line that cannot hold registration on small passives.
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FAQ
What component sizes can Chinese pick-and-place lines handle?
Mainstream lines handle down to 0201 and BGA/QFN packages reliably; 01005 placement requires newer high-accuracy machines and tighter process control. Confirm the smallest package on your BOM is within their spec.
How is placement quality checked?
Post-reflow AOI catches misalignment, tombstoning, and missing parts; X-ray is added for BGA and bottom-terminated packages. Ask for AOI defect-rate data from recent runs.
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