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0402 chip capacitor with solder spatter

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#51053

0402 chip capacitor with solder spatter | 16 July, 2007

Hi All,

Recently, we encountered strange defect at our SMT line. We can see solder ball spatter around at one of the component pad. This lead to insufficient solder defect at 1 side of the component. The other side of the component look good(Meet IPC 610 spec). This problem only happen at this 0402 chip capacitor. Others component on the motherboard do not have this problem.

Initially, we thought it was component(0402 chip capacitor) issue related. However, we still found the same problem after we used part from other supplier. This show this defect shouldn't be part related.

We believe this issue should not due to solder paste or PCB or moisture. If this were due to one of the mention factor, we should see this problem across the motherboard. However, the fact is this problem only appear on 0402 chip capacitor's one of the terminal side with solder ball spatter around it.

Very strange...Anyone experience this before?

Thanks, Jacky

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#51056

0402 chip capacitor with solder spatter | 16 July, 2007

For the problem part, describe the pads on the board and the aperatures on the stencil.

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#51062

0402 chip capacitor with solder spatter | 16 July, 2007

Hi Jacky, It seems you have solder bead problem, beading occurs when the solder paste brick splatter as a component is placed into it, after reflow, the splatter becomes a spherical solder ball. Hope this will help. Steve USA STENCILS

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#51151

0402 chip capacitor with solder spatter | 20 July, 2007

Jacky, we have had a similar problem. We needed to go to a smaller nozzle and also check your vacuume system and air kiss.Could be after placement when the machine blows air to insure the part is off the nozzle that it is effecting the solder brick.

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