The MAC37-7HR from Digitron Semiconductors is a Triac with Breakover Voltage 500 V, Breakover Current 225 A, Gate Trigger Voltage 1 to 3 V, Gate Trigger Current 20 to 75 mA, Temperature Operating Range -40 to 110 Degree C. Tags: Stud Mount. More details for MAC37-7HR can be seen below.