I'm working on a circuit to turn on and off a set of lights on a vehicle.
I have to do the switching on the high side of the lights and need to use a positive voltage to trigger them on. So, I've got a little NPN transistor that grounds the gate of my P-Channel FET when it gets voltage and sends current from the battery to the light.
It works great breadboarded out but I am concerned about protecting the MOSFET and (maybe the BJT) when it's on a vehicle. Do I need a Zener or TVS diode somewhere? Where should it go? What does it need to do? What values do I need to look for when sourcing it? I am more than happy with overkill.
This is the FET I was planning on using: SQJ459EP. It has a diode built in between the drain and the source but it might need something to protect the gate?
Thank you guys for any help you can give me!
Edit: Fixed Schematic