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Strange empty ball on chip component after reflow

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INGE

#45808

Strange empty ball on chip component after reflow | 30 November, 2006

Hi everybody, The matter is this: after reflow, on top side leads of chip components (resistor 0805)appear some empty balls of solder. In some cases this thing is only on the lead and the solder joint seems good, in other cases this empty ball is also in the meniscus and so you can touch and explode the joint with a needle. All the other components of the board are weel soldered, only some resistors from precise reel behave in this way. What do you think could be the problem? I have some photo, if you want to see them, please tell me where to send.

Thanks in advance

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#45822

Strange empty ball on chip component after reflow | 30 November, 2006

I think you answered your own question. Try a different lot or mfger of this part. You can prolly get a sample sent over nite and hand place them to verify.

Trying to find out why these resistors "explode" when touched with a needle is like finding that needle in a haystack made or 0805 resistors!

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#45833

Strange empty ball on chip component after reflow | 30 November, 2006

We'll take a pix

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