The SiHD3N50D from Vishay is a MOSFET with Continous Drain Current 3 A, Drain Source Resistance 2600 to 3200 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Surface Mount. More details for SiHD3N50D can be seen below.