The SiHP21N80AE from Vishay is a MOSFET with Continous Drain Current 17.4 A, Drain Source Resistance 205 to 235 milliohm, Drain Source Breakdown Voltage 800 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for SiHP21N80AE can be seen below.