The STP55NF06L from STMicroelectronics is a MOSFET with Continous Drain Current 55 A, Drain Source Resistance 14 to 20 Milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -16 to 16 V, Gate Source Threshold Voltage 1 to 1.7 V. Tags: Through Hole. More details for STP55NF06L can be seen below.