Does desoldering the ad8221 in-amp using a sucker cause it to malfunction?
The AD8221 has gone through a soldering heat resistance qualification test in which it was subjected to ~260 degrees Celsius for 30s with a specific humidity, per IPC/JEDEC J-STD-020D.1. Still, soldering irons can get considerably hotter than this. Excessive heat inside the chip can cause internal delamination or cracks, or even loosen bond wires, which can cause chip failure or reliability issues.
So, short answer is, not specifically. But if you're not careful where and how long you apply heat, your part may not work anymore. Additionally, it is important to pay a lot of attention to cleaning after desoldering. Remaining solder or flux on the board or the chip can conduct currents. Personally, I find it easier to use solder wick to get most of the solder off of the leads and a hot air gun to lift the chip off of the board.
I hope this helps,
Thanks Scott, that was really helpful, but this might be starnge is their any other way to know the ic is working other than connecting it to a circuitry. I'm not sure if i had applied over heat to my component. I applied heat only to pcb but still it's connectred with the pad. Also will my normal sucker allow to desolder it. It seems for me the sucker is not doing much of an help. Thanks a lot for the previous information again.
There's not really a way to evaluate an amplifier without a circuit. If you have a lot of parts that need to be verified, you might want to build up a test board. You could use the AD8221 evaluation board for this or for reference of your own pcb design. If you want to avoid soldering and desoldering every time, there are sockets or clamps so you can screw or clamp down a part as a quick verification that it works, but these are generally very expensive. Otherwise, you pretty much have to put it on a circuit board and probe your inputs and outputs for functionality. Another note, all of ADI's parts are tested before they are shipped to guarantee max and min specs, so fresh out of the tube, if you're careful about electro-static discharge (ESD), your chip will work. As for the solder sucker, I think it's possible, but I wouldn't really recommend it for desoldering anything this small. Solder wick is pretty cheap though and after that, a little heat and lifting should get your component off of the board without having to apply much heat. Sparkfun has a nice tutorial that talks a little bit about solder wick if you want to look at it:
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