Hi guys and gals,
I’m looking for a bit of guidance on the best MOSFET for my application. I am using an Arduino DUE to turn on and off a multitude of High Power Contactors (Gigavac GX26). I am plenty familiar with the software side of things but spacing out hardware is not my strong suit and I am sure that some of you are experts in that. If you could help me spec out the best FET for the job I would really appreciate it. In the past I have used a photovoltaic transistor to drive the mosfets since the 3.3v logic level of the Due is not very useful for that task.
The specs on the coil of the contractor are:
Coil Voltage Nominal: 12v (this is in a vehicle application running at 13.6V)
Coil Voltage Max: 16V
Pick-Up Voltage Max: 8v
Drop out Voltage: 0.5 to 4.5V
Pick Up Current Max: 3.8A
Coil Current: 0.64A
Coil Power: 7.8W
The unit is internally suppressed with the appropriate flyback diode
Attached is the circuit that I have designed for this job. I have built this once before with relatively good success but I really need this next iteration to be spiced correctly and as such I am unsure of the best components to go with.
Thank you in advance for the help!