The schematic: 12v solenoid with a flyback diode and a low side N-ch mosfet driven by PWM.
I'm using a sot23 mosfet 2.5v rated with a 3.3v logic device and its Vgs(max) is at 12v. This is NOT Vgs(th) max, in case there is confusion. As you can see it's close to the max voltage it can block between the gate and source terminals and that's bothering me. While a fast switching diode will deal with the solenoid turn-off, during its active operation there is nothing protecting the mosfet from transient voltage. Also, the use of a unregulated power supply could briefly exceed Vgs(max) from a no-load state.
So, am I missing something? what's the best approach here?
Thanks.
I'm using a sot23 mosfet 2.5v rated with a 3.3v logic device and its Vgs(max) is at 12v. This is NOT Vgs(th) max, in case there is confusion. As you can see it's close to the max voltage it can block between the gate and source terminals and that's bothering me. While a fast switching diode will deal with the solenoid turn-off, during its active operation there is nothing protecting the mosfet from transient voltage. Also, the use of a unregulated power supply could briefly exceed Vgs(max) from a no-load state.
So, am I missing something? what's the best approach here?
Thanks.