I want to buy a MOSFET in the UK to switch an additional 12v fan under control of one of the GPIO pins, and I'll get a couple of spares in case I ever need to replace the ones in my RAMPS. I shall probably use the 7switch circuit design by Traumflug, but I can't find the IRLB8743 available locally.
Yes, I've seen the recommendations ( IRLB3813, IRLB8743, FDP8870, AOT240L, CSD18502KCS) but they aren't exactly abundant here (when you just want 2 or 3). Can anyone tell me what the important specs are if I'm looking at other models?
I think I've worked out:
Vgs < 3.3v
Vds > whatever you plan to switch (plus some overhead)
Id > 50A (less than that gets too hot when using PWM)
Any other values I need to be concerned about (Rds)?
Or am I unlikely to find any viable alternatives?
Yes, I've seen the recommendations ( IRLB3813, IRLB8743, FDP8870, AOT240L, CSD18502KCS) but they aren't exactly abundant here (when you just want 2 or 3). Can anyone tell me what the important specs are if I'm looking at other models?
I think I've worked out:
Vgs < 3.3v
Vds > whatever you plan to switch (plus some overhead)
Id > 50A (less than that gets too hot when using PWM)
Any other values I need to be concerned about (Rds)?
Or am I unlikely to find any viable alternatives?