The TISP4400M3BJ from Bourns is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 0.6 A, Gate Trigger Voltage 300 V, Gate Trigger Current 30 A, Temperature Operating Range -40 to 85 Degree C. Tags: Surface Mount. More details for TISP4400M3BJ can be seen below.