© Copyright 2026. All Rights Reserved
BT139 TRIAC, from triode for alternating current, is a generic trademark for a three-terminal electronic component that conducts current in either direction when triggered. BT-139 Thyristor has high blocking voltage capabilities Its formal name is bidirectional triode thyristor or bilateral triode thyristor.
Best online shopping website for BT139 TRIAC General Purpose Thyristor in a cheap price in Lahore, Islamabad, Karachi, Faislabad, Multan, Quetta, Sukkur, Peshawar, Rawalpindi, and all over Pakistan
BT139 is a sensitive gate triac suitable for direct coupling to TTL, HTL, CMOS, and applications such as various logic functions, low power AC switching applications, such as fan speed, small light controllers, and home appliances equipment.

| Pin No | Pin Name |
|---|---|
| 1 | Cathode |
| 2 | Anode |
| 3 | Gate |
Features
| Type | Vdsm (V) | dV/dT (V/µs | It (A) | Igt (mA) | Vgt (V) |
|---|---|---|---|---|---|
| BT139 | 500 | 250 | 16.0 | 25 | 1.5 |
You can download this datasheet for BT139 16A 500V TRIAC – Datasheet from the link given below: