The BTB04-600CW from Youfeng Microelectronics is a Triac with Breakover Voltage 600 V, Breakover Current 40 A, Gate Trigger Voltage 1.3 V, Gate Trigger Current 35 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for BTB04-600CW can be seen below.