TO-220 FETs (De)Soldering Technique

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hias9   100 W

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TO-220 FETs (De)Soldering Technique

Post by hias9 » Apr 18 2019 5:57pm

I plan to upgrade the FETs of a KT controller. I did some tests trying to desolder the TO-220 FETs of a broken controller both with the soldering iron and the heatgun and I prefer the soldering iron at the moment. However I need high temperatures for both ways.
The FETs I am desoldering don't need to survive it. Important is that the rest of the board will not be damaged.

Soldering the new FETs I plan to do with soldering paste.

Does anybody have experience with (de)soldering TO-220 MOSFETs and what is your favorite technique?

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DogDipstick   10 kW

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Re: TO-220 FETs (De)Soldering Technique

Post by DogDipstick » Apr 19 2019 10:46am

Wick from the back. Pencil iron or other low power iron,. You do not want to burn the trace.
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docw009   100 kW

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Re: TO-220 FETs (De)Soldering Technique

Post by docw009 » Apr 19 2019 11:58am

SInce they are standing up, I suppose I would snip off the leads with a small side cutter. Solder sucker, solder iron, and pliers should get the remnants out.

billvon   1 GW

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Re: TO-220 FETs (De)Soldering Technique

Post by billvon » Apr 19 2019 12:34pm

hias9 wrote:
Apr 18 2019 5:57pm
Does anybody have experience with (de)soldering TO-220 MOSFETs and what is your favorite technique?
1) Cut the leads flush with the boards.
2) Reflow the solder on the remnants of the leads.
3) Slam the board against a piece of wood. Momentum will carry the lead out and should leave the thru-hole open.
--bill von

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