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Okay in common power clamp for esd protection NMOS transistor is commonly used as Pull-Down of ESD current from VDD to VSS rail. I wonder if PMOS transistor can replace NMOS transistor in this situation?
Yes sometimes pmos devices are used. They will need a larger area than nmos for the same ESD current. They are less prone to snapback breakdown which I assume is why they are sometimes preferred.
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