4/30/2023 0 Comments 8 relay module datasheetThere are probably thousands of alternatives here, but some more details could help. Perhaps, if you drive the transistor directly from a microcontroller output, you could consider a darlington transistor with high hfe.īut on the other hand, if the Arduino pin is 5V, the 1k base resistor will give a base current of several mA, so even a BD139 could be enough. I looked at a random 10A/230V relay with 12V coil voltage, and it has a current draw around 55mA nominally, so a transistor with at least 0,2A current capacity, 50V voltage rating and hfe >100 could be okay. This is mainly a factor when designing for long contact life of the relay. What voltage is your VCC and what relay (specific model or coil voltage/current/resistance) do you use?įor typical small relays a 1A rectifier diode 1N4007 or equivalent could be a suggestion.īe aware that the switchoff time of the relay is lengthened by the diode in order to compensate for this sometimes a transistor that can withstand higher voltages and a zener type diode is used, such that the reay coil voltage during the collapse of the magnetic field is higher than the 0,7V you get in the above scenario.
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