The PSMN1R9-40YSD from Nexperia is a MOSFET with Continous Drain Current 162 to 200 A, Drain Source Resistance 1.6 to 3.7 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.4 to 3.6 V. Tags: Surface Mount. More details for PSMN1R9-40YSD can be seen below.