BT136 Triac Transistor, TO-220

The BT136 Triac is a bidirectional electronic switch capable of conducting current in both directions once triggered by either a positive or negative gate voltage. This bidirectional behaviour makes triacs the go-to choice for controlling AC loads, such as dimming lights or adjusting the speed of AC motors, directly from a digital control signal.

With a maximum terminal current rating of 4A and a maximum terminal voltage of 600V, the BT136 can safely switch a wide range of AC loads. It requires just 1.4V of gate voltage and 10mA of gate trigger current to switch on, low enough to be driven directly from Arduino or Raspberry Pi boards operating at 5V or 3.3V logic.

• Device type – Bidirectional triac (AC switch)
• Maximum terminal current – 4A
• Maximum terminal voltage – 600V
• On-state gate voltage – 1.4V
• Gate trigger current – 10mA
• Holding current – 2.2mA
• Latching current – 4mA
• Package – TO-220

Whether you are building an AC dimmer, an AC motor speed controller, or another power-control circuit for loads under 4A, the BT136 lets a low-voltage microcontroller reliably switch mains-level AC power. The BT136 Triac Transistor is a compact and effective component for AC power control projects.