The PSMN057-200B from Nexperia is a MOSFET with Continous Drain Current 27.5 to 39 A, Drain Source Resistance 41 to 165 milliohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 4.4 V. Tags: Surface Mount. More details for PSMN057-200B can be seen below.