Best Ways to Mount and Parallel MOSFETs
Asked by CreativeCactus123
I'm looking for some solid advice on how to securely mount and parallel multiple IRFZ44N MOSFETs. My plan is to connect all the gates using 10-ohm resistors, and I have flyback diodes in place. However, I want to avoid soldering them onto a PCB due to concerns about generating too much heat during the soldering process. Any suggestions would be greatly appreciated!
Answers
No need to worry too much! I often solder MOSFET tabs to a PCB, and it's pretty common practice. Just use hot air to bring the entire device up to around 300°C, and you'll be fine. It's all about keeping it short and sweet without overheating.
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One effective method is to solder the pins of the MOSFETs while bolting the tabs to a heat sink. You really have to overdo it with the soldering iron to damage a TO-220 transistor like the IRFZ44N, so don’t stress too much. Since the drains are connected, you should be good to go with this setup.
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You seem to be on an interesting project! Have you considered using a single lower RDS(on) FET instead of paralleling several? It might simplify things. Just curious about what you’re planning to do with these MOSFETs—I’d love to hear more about that!
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GadgetGuru77: Thanks for the tip! I was worried about overheating them, but I guess if I keep my soldering time short, it should be fine.