Ah yes the classic capacitor crack. All that has happened is applying heat
has relieve stress closing the crack. It is still there and will reappear
after the product has shipped to your customer.

John Maxwell

At 02:40 AM 4/21/2006, you wrote:

>Hi everyone,
>
>We'd a capacitor problem recently which we suppose that the soldering
>proses causes it.
>
>In our first board in which this problem occured, our 805 case 1nF Multi-
>Layer-Ceramic SMD capacitor behave like resistance (33k ohm) after assembly
>process. When we heat its pads up with a soldering iron, the problem
>disapperad.
>
>In our second board in which this problem occured again, we disconnect one
>pin of the damaged SMD capacitor, and we still measure 23kohm resistance
>value, then we disconnect both capacitor pins and measure the capacitor
>alone, than we still measured 23k, however, when we apply continious heat
>for 5 sec.with soldering iron again, we observed that the wrong resistance
>value 23k increased till several megaohms is measured.
>
>
>I wonder if anyone is faced with such a problem before with their SMD
>capacitors? I really do appreciated if you can send any comments with this
>problem
>
>
>ps: We use SAC305 alloy in our electronic boards for wave and reflow
>soldering.
>
>
>Best regards,
>
>
>Ahmet
>
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