PCB News - Permissible standard for tin bead on pcb board

Permissible standard for tin bead on PCB board

PCB factory: why not allow tin beads to appear? It's actually very simple: PCB boards can be more beautiful without tin beads. The allowable standard for tin beads on PCBs. The PCBA appearance inspection standard is a basic standard for the acceptance of electronic products. PCBA processing has requirements for the size of the tin beads on the PCBA board. This requirement must be determined according to customers. After all, in our industry, Customers are always God! According to different products and different customer requirements, the acceptable requirements for tin beads will be different. Generally, the standard is determined based on the national standard and combined with the customer's requirements.

Acceptable standards for PCBA processing tin beads:

Some industry standards explain tin beads. The classification ranges from the MIL-STD-2000 standard that does not allow tin beads to the IPC-A-610C standard that has less than 5 per square inch.
In the IPC-A-610C standard, the minimum insulation gap is 0.13 mm, and tin balls with a diameter within this are considered qualified; while tin balls with a diameter greater than or equal to 0.13 mm are unqualified, the manufacturer must take corrective measures Measures to avoid this phenomenon. The latest version of the IPCA-610D standard formulated for lead-free soldering does not clearly stipulate the phenomenon of solder beading. The rule of less than 5 tin beads per square inch has been removed. However, the standards for automobiles and military products do not allow any tin beads, so the PCB circuit boards must be cleaned after soldering, or the tin beads must be removed manually.

This is the permissible standard of tin bead on PCB during PCB processing. I hope this article can help you solve some related problems about tin bead on PCB.

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