The GA05JT12-263 from Navitas Semiconductor is a Junction Field Effect Transistor (JFET) with Continous Drain Current 5 to 15 A, Drain Source Breakdown Voltage 1200 V, Drain Source Resistance 0.18 to 0.368 Ohm, Gate Current 0.25 A, Gate Reverse Current 0.25 A. Tags: Surface Mount. More details for GA05JT12-263 can be seen below.