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Old 05-12-2016, 05:56 PM   #1
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Default Relay or MOSFET for 24V and 2A

I'm working on a small project where I want to use my Raspberry PI to turn on/off a power resistor for temperature control. I'm looking at a maximum of 50W and I have a 24VDC power supply so I will be looking at approximately 2A through the power resistor.
Would this design be best by using a MOSFET to activate a 24VDC relay or would it be fine to simply use a MOSFET that would be rated for 2A and skip out on the relay?
I'm hoping that I can drive it directly from the Raspberry PI so naturally the gate current would need to be kept low as well as the gate voltage as I won't have more than 5V.
Any good advices on a specific MOSFET that might be handy?
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Old 06-03-2016, 09:01 AM   #2
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A simple N MOSFET will do.
there are thousands.

Look for:
* VDS > 30V (better 40V)
* V_GS_TH < 3V
* R_DS_ON < 50mOhms (At 4.5V V_GS or below)
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Old 06-13-2016, 08:41 PM   #3
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If you planned to supply the relay coil with the same voltage already used by logic devices, I agree to prefer an N-Mosfet. Relays in general generate expressive spike on power bus during On/Off switching.
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