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The relay needs to use the condition of the flyback diode.

Hardware design
octubre 27, 2020 by Carson 1459

Assuming a low-power signal relay, 3V, 140mW coil, driven by a 2N3904 NPN transistor, do I need a flyback diode? If necessary, what parameters determine it?

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Erin Publicado en October 27, 2020

Have you used LTspice, I tried it without a diode, the peak value is 11kV

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Cody Publicado en October 27, 2020

I tried adding 1N4148, and I can get the peak value to +4V (though I did not consider the dissipation)

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Nolan Publicado en October 27, 2020

What should be considered is the energy that will damage the transistor, similar to an electrostatic pulse

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Brody Publicado en October 27, 2020

The flyback diode is selected according to the voltage and current. For example, your coil voltage is 3V and the power is 140mW, so the current=0.14/3=0.046A, then you can choose the diode, you can choose 1N4007, because this is very cheap Of it.

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