LOW NOISE: 1.2 NV/√HZ TYPICAL FAST SWITCHING LOW CUTOFF VOLTAGE: 2N4393 < 3.0V Gate 3 DESCRIPTION The -40V 2N4391, 2N4392 and 2N4393 are targeted for switch, chopper and commutator designs. Gate leakages are typically less than 50pA at room temperatures. The 2N4393 has a cutoff voltage of less th.