The STD40P8F6AG from STMicroelectronics is a MOSFET with Continous Drain Current -40 A, Drain Source Resistance 18.5 to 28 Milliohm, Drain Source Breakdown Voltage -80 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -4 to -2 V. Tags: Surface Mount. More details for STD40P8F6AG can be seen below.