| Electronics > Beginners |
| Would solder paste or alcohol/IPA go inside an IC when soldering and cleaning? |
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| bjdhjy888:
For example, in this video, solder paste was used to tin pins. Then alcohol or acetone was used to clean up. You can see the liquid form of these materials both covered the casing of the IC. When I solder, the same thing would happen. I sometimes rinse my entire IC with 95% alcohol or IPA to clean it up. So, my concern is, would solder past or acetone or IPA go inside an IC when soldering and cleaning? If yes, would they damage the internal circuits? Or, the casing of the IC is always very tight and nothing could go inside? Please help. Thanks! |
| T3sl4co1l:
The case is sealed, using a fairly rigid material. If it cracks, environmental contamination can be exposed to the die, but more importantly, a bondwire (trapped in the encapsulant) has probably been broken in the process, and now the part is useless. This is unusual to happen, even with soldering heat; but some conditions can cause problems. For example, if the material tends to absorb moisture, which is then released rapidly at high temperature, it can crack apart. Slow heating, and preferably a bake-out cycle (modest heating for a longer time, in a dry atmosphere), avoids this. Tim |
| Kasper:
I think a more real concern is flux residue being left under the IC causing mild conductivity between pins or corrosion. Not something that has come up much for me except in avionics when we had to hipot test. There was specific part that we would have to replace sometimes and if we didnt clean the board before and after installing the new one then it would fail hipot. hipot test: apply high potential (~1000V) and make sure no current flows. |
| RoGeorge:
--- Quote from: bjdhjy888 on August 16, 2019, 02:56:03 pm ---... So, my concern is, would solder past or alcohol go inside an IC when soldering and cleaning? If yes, would they damage the internal circuits? Or, the casing of the IC is always very tight and nothing could go inside? --- End quote --- No. Yes. Yes. |
| chemelec:
NO. And Alcohol will probably Not Remove solder Flux very good. Acetone is better, than followed with some Water. I Use Water Based Solder Flux, so just washing it off in Warm Water Removes all the Flux. Personally I Recommend a Kester 331, .80mm Diameter, 63/37 Solder. |
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