PCBA board tin bead size acceptable standards

PCBA Tin can receive standard:

1, tin ball diameter not exceeding 0.13mm

2,600mm2 within the scope of 0.05mm-0.13mm diameter tin beads does not exceed the number of 5 (one-sided)

3, the number of tin balls below 0.05 does not make the request

4, all tin beads must be fluxed by the flux can not be moved (solder encapsulated to the height of solder beads more than 1/2 is judged to be coerced)

5, tin beads did not make different network conductor clearance to 0.13mm less

Note: except for special control area

Tin beads rejection standards:

Accept the standard of any non-compliance are judged as rejected.

Note:

1, special control area: the gold finger differential signal line on the capacitive pad around the 1mm does not allow the presence of visible 20x microscope beads

2, the presence of tin beads itself on behalf of the process warning, SMT chip manufacturers should continue to improve the process so that the occurrence of tin beads to a minimum.

printed circuit board assembly appearance inspection standard is one of the most basic standards of acceptance of electronic products, according to different products and customer requirements, the acceptable requirements of tin beads will be different, generally based on the national standard, combined with customer requirements To determine the standard.