The TISP4145M3BJ from Bourns is a Silicon Controlled Rectifier with Breakover Voltage 145 V, Breakover Current 0.6 A, Gate Trigger Voltage 120 V, Gate Trigger Current 30 A, Temperature Operating Range -40 to 85 Degree C. Tags: Surface Mount. More details for TISP4145M3BJ can be seen below.