![]() The 30V-rated IRFR3708 has less than 30m \$\Omega\$ Rds(on) with 2.8V drive (more than 5x worse) and is a fair bit more expensive (around double). However, it's only rated at 20V so it can't be counted on to switch a 24V motor. At a 3.3V Vgs it will only conduct a few mA before the voltage across it may rise unacceptably.Ī more appropriate part for switching a small-ish motor might be the AOD424 which is guaranteed to have less than 5.7m \$\Omega\$ Rds(on) with 2.5V drive (at room temperature, it will be considerably more when hot). ![]() ![]() The 2N7000 is inappropriate for this application. ![]()
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