PCBA Tech - In Shenzhen PCB processing, the tin bead on the surface of PCBA board can accept the standard

In Shenzhen PCB processing, the tin bead on the surface of PCBA board can accept the standard
In the process of PCBA processing in Shenzhen, workers often have some tin beads remaining on the PCBA board, which cannot be completely avoided. In our industry, there is an acceptable standard for the size and quantity of the tin beads on the PCBA board. Then the editor below shares the acceptable standards of PCBA appearance inspection standards (referred to as national standards) for PCBA surface tin beads.

The acceptable standards for tin beads in Shenzhen PCBA processing are as follows:

1. The diameter of the tin bead does not exceed 0.13mm

2. The number of tin beads with a diameter of 0.05mm-0.13mm in the range of 600mm2 does not exceed 5 (single side)

3. The number of tin beads below 0.05 is not required

4. All tin beads must be entrapped by the flux and cannot be moved (the flux encapsulated to more than 1/2 of the height of the tin beads is judged to be entrapped)

5. Tin beads did not reduce the electrical clearance of different network conductors to less than 0.13mm

Note: Except for special control areas

Rejection standards for tin beads in Shenzhen PCBA processing are as follows:

Any non-compliance of the acceptance criteria is judged to be rejected.

Remark:

1. Special control area: Tin beads visible under a 20x microscope are not allowed within 1mm around the capacitor pad on the differential signal line at the golden finger end

2. The existence of tin bead itself represents a process warning. SMT chip manufacturers should continuously improve the process to minimize the occurrence of tin bead.

The PCBA appearance inspection standard is the most basic standard for the acceptance of electronic products. According to different products and customer requirements, the acceptable requirements for tin beads will be different. Generally, it is based on the national standard and combined with customer requirements. To determine the standard.

The above is the relevant knowledge of the acceptable standards of tin bead on PCBA board surface in Shenzhen PCBA processing. If you want to read more articles, please continue to pay attention. If you need Shenzhen PCB processing business, please contact our customer service staff.
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