The STB30N65M2AG from STMicroelectronics is a MOSFET with Continous Drain Current 20 A, Drain Source Resistance 150 to 180 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for STB30N65M2AG can be seen below.