SDG #103 Pick and Place Service for your PCB Designs with JLCPCB

Ordering bare boards is cheap and easy, but hand placing dozens of 0603 parts and QFN packages on every prototype becomes tedious. This episode examines what changes when the placement work is handed to JLCPCB’s SMT assembly service, and what a designer needs to prepare before that order can be accepted.

The practical conclusions centre on the workflow rather than the marketing. Assembly depends on the parts already being in the house library, so component selection has to happen at the schematic stage, not after routing is finished. Anything exotic, tall or through hole is likely to come back to the bench anyway. Two extra files matter as much as the Gerbers: the bill of materials and the pick and place, or centroid, file, and both need consistent designators, correct part orientation data, and origin points that match what the machine expects. Rotation errors on polarised parts such as diodes and ICs are the classic failure mode, and they are worth double checking in the online preview before paying.

On the quality side, the interesting question for a buyer is whether machine placed, reflowed joints are actually better than careful hand soldering under a microscope. Inspection of fine pitch parts and passive alignment is where that is answered, and it is also where it becomes clear whether stencil and paste volume were sensible.

For low volume prototyping the arithmetic is straightforward: if a board carries many repeated passives or a difficult central IC, paying for placement usually recovers hours of bench time and reduces the risk of scrapping an expensive board through a tombstoned or bridged part.