What are the accuracy of SMT process?

We've been asked by our customers from time to time, especially those companies whom are new to electronic manufacturing industry, or they just buy and sell it. The questions is

What is the accuracy or tolerance of SMT and pick and place process?

Please therefore review our standard of acceptance for the circuit assembly accurancy as below


for rectangle or square components



acceptable grade 1&2

side off (A) is less or equal to 50% of component wide (W), or 50% of connecting pad width (P), use the smaller one as standard

acceptable grade 3

side off (A) is less or equal to 25% of component wide (W), or 25% of connecting pad width (P), use the smaller one as standard

for ball grid array (BGA)




standard: BGA solder ball locates in the pad center, no wide off

defect(unacceptable)

the solder ball off wide and over minimum electric gap


Chee mau offers most cost-effective PCB building and PCB assembly service, please contact us for a good quote.

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