The SiHH21N65EF from Vishay is a MOSFET with Continous Drain Current 19.8 A, Drain Source Resistance 157 to 180 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for SiHH21N65EF can be seen below.