BT139-600E

The BT139-600E is a 16 A, 600 V triac in a TO-220AB package for switching and controlling AC loads on the mains. A triac is a bidirectional thyristor: once a gate pulse turns it on, it conducts in both directions until the current falls to zero at the end of the half cycle. The E version has a sensitive gate that triggers with only 10 mA, so it is easy to drive through an opto-triac from a microcontroller.

BT139-600E Specifications

• Type: triac (bidirectional thyristor), four-quadrant
• Repetitive peak off-state voltage: 600 V
• On-state current: 16 A RMS
• Surge current: 155 A non-repetitive peak
• Gate trigger current: 10 mA maximum in quadrants 1 to 3, 25 mA in quadrant 4
• Maximum junction temperature: 125 °C
• Package: TO-220AB
• Pins: 1 = T1 (MT1), 2 = T2 (MT2), 3 = gate; the metal tab is connected to T2

BT139-600E Applications

• Lamp dimmers and heater controllers
• Speed control of universal motors in fans and drills
• Solid-state relays with MOC3041 or MOC3021 opto-triac drivers
• Switching AC loads such as heaters, pumps and solenoid valves from an Arduino
• Power electronics labs

What's in the Box

• 1 × BT139-600E triac

Tip: This part switches mains voltage, so work with the power off and insulate every connection. Drive the gate through an opto-triac such as the MOC3041 (zero-cross, for on/off switching) or MOC3021 (for phase-control dimming). The tab is connected to T2, so use an insulating pad on a shared heatsink, and add an RC snubber for inductive loads such as motors.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.