/diy/ - Do It Yourself

>>1528883
apply safety margins to all inequalities below, and assuming clean ON-OFF switching:
1. filter by basic parameters: Id(max) > Iload, Vds and BVdss capability appropriate for circuit, Vgs rating suits the drive available. if you have a particular need for low Rds due to load characteristics, package size limitations, etc., also Rds(on) and maybe take a guess at Pd(max)
2. ensure the Rds(on) is sufficiently low at the Vgs you will be applying
3. check the Vds vs. Id and Vgs vs. Id graphs to verify that, given the Vgs you will be applying, it will pass the desired Id with an acceptable Vds drop
4. check that thermal and power dissipation limits will not be exceeded under operating conditions, Pd(max) < Rds(on) * Iload
other parameters may be relevant for particular applications, eg turn-on time, gate charge, body diode parameters, high-temperature parameters, safe operating area
Pic related, my usual jellybean n-MOSFET for low-power applications, annotated. which just happens to be suitable for your application