wrong mosfets polarity

I think that you have a mistake in the mosfet drawing. The IRF9350 it is a P-channel and it is showed as an N-channel. Same also for the IRF530. It is look like they are reverses.The IRF530 it is an N-channel mosfet.

by tauro0221
April 06, 2012

You are correct about the device types, but incorrect about the symbol errors. If a 4 terminal mosfet symbol is used (drain/gate/source/body), then the BODY terminal would have an arrow to indicate polarity, with an arrow pointing towards the gate indicating the channel is n-type (body is p-type) for an NMOS device. This seems to be what you are used to.

Using a three-terminal MOSFET symbol as CircuitLab does, the convention is to use an arrow on the SOURCE pin; the convention being identical to that of bipolar transistor: an arrow pointing out on the source indicates an NMOS device, similar to an NPN symbol.

Reverse for PMOS, and convention suggests the SOURCE on PMOS is at the top of the symbol as is the PNP emitter)

by CarlSawtell
April 13, 2012

Thank you for the correction. Normally I checked the arrow to determine if it is a P or N.

by tauro0221
April 14, 2012

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