I have three MOSFET in a row, each separated about 2.5mm apart with the backs facing each other. Is this a good idea?

N.B Each MOSFET will be sinking 20mA and 60 mA in total for all three MOSFET. I am using an IRF540. The schematic below is for ONE MOSFET.

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  • yes it's fine. worse-case, one switches the other on if they get bent. – dandavis Jul 29 '18 at 17:05
  • Arduino's are often used to drive MOSFETs to sink current for higher loads, so this seems perfectly on topic to me. I even made a board with 4 shift registers and 32 1A MOSFETs crossroadsfencing.com/BobuinoRev17 for driving LED strips and small motors from an Arduino. – CrossRoads Jul 30 '18 at 17:38
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    @CrossRoads Arduino was created in Ivrea, Italy. Does this mean that on arduino.stackexchange travelling questions to Italy are on topic? – frarugi87 Aug 1 '18 at 15:04

Power dissipation is only a couple of milli-watts. So heat is not an issue.

Just make sure the metal tabs can’t touch each other. Personally I might add some Kapton tape. Electrical tape would work in this case, but feel wrong to me.

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