The BT137B-800G,118 is a TRIAC (Triode for Alternating Current) manufactured by NXP. It is a 600 V, 8 A, sensitive gate TRIAC which is suitable for general purpose AC switching and phase control applications. It has a rating of 8 A at 400 V, 8 A at 250 V, 4 A at 600 V, and 4 A at 800 V. The BT137B-800G,118 is surface mountable and features a low on-state resistance for improved performance and low thermal losses. It also provides stability against inductive loads and false triggering.