The BT137-800E is a SCR thyristor manufactured by NXP. It is designed to switch high power applications such as appliances, motors, lighting, and power supplies. This device has an optimized package and offers excellent thermal characteristics and high power ratings. This device is ideal for AC voltage applications and is available in the TO-220, TO-220F, and TO-247 packages. It has a maximum forward surge current of 40A, a maximum on-state voltage drop of 1.80V, and a maximum voltage of 800V.