The GA20JT12-263 from Navitas Semiconductor is a Junction Field Effect Transistor (JFET) with Continous Drain Current 20 to 45 A, Drain Source Breakdown Voltage 1200 V, Drain Source Resistance 0.05 to 0.095 Ohm, Gate Current 1.3 A, Gate Reverse Current 1.3 A. Tags: Surface Mount. More details for GA20JT12-263 can be seen below.