Yep... it's that 3.3v Mosfet topic again lol
Literally every mosfet I have found in examples on the Net (Si2302 etc) are now listed as obsolete in Digikey.
Their recommended replacements are not suitable for 3.3v switching.
I want an N-channel that will switch 2A off my 3.3v Nano. SMD would actually be better than through-hole, but not that fussed.
Any recommendations? I'll keep poking around for now
BUT! Are they available?
No.... not available and I don't want to design something that is obsolete
How about this (quite literally no idea what I am selecting here.....)
As long as you are looking for devices with legs, they will ALL be obsolete! Can you handle surface mount devices in your project?
Yes... I want SMD. My entire PCB is SMD
Look at this beast... is it the Drive Voltage (Max Rds On, Min Rds On) I should be looking at?
I think the IR part should work fine. Unless you are doing PWM, you basically need to look at three specs. The first is the G/S threshold voltage, which is the voltage at which the mosfet just begins to turn on. That should be a couple volts lower than the actual gate switching voltage you will use (3.3V). The second is the current, and the third is the on-state resistance. The IR part looks fine on all three.
Another choice might be the AOSS32136C. Digikey has a quarter-million in stock, about the same price as the IR. Similar specs.
I think the AOD424 is overkill. But it would certainly work.
baffled2023 is suggesting a great part. I use it doing PWM with a 5V Arduino without any problems. At 2A I see no problems, I would expect it to stay fairly cool. When you put the pull down resistor to keep it off during reset etc place it from the port pin to ground, not the gate as that forms a voltage divider. There are many other parts for less money but if the column is not to high this would be a great part.
Thanks for the advice! I'll grab a few of each and trial them
That will be fine with 2A if your voltage is less than 20V and you don't have an inductive load
The pin out of MOSFETs are standard (drain, source, gate) so do not worry about obsolete components.
i.e. a SOT23 is a SOT23
You can buy 1,000 for $23.00 on ebay.
FYI, MOSFETs I use:
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