The ISM120NT4-19 from ISOCOM is a MOSFET with Continous Drain Current 12.5 to 19 A, Drain Source Resistance 160 to 290 milli-ohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 25 V, Gate Source Threshold Voltage 1.8 to 2.5 V. Tags: Surface Mount. More details for ISM120NT4-19 can be seen below.