BT136 600 V 4A Triac TO-220

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The BT136 is TRIAC with 4 A maximum terminal current. The gate threshold voltage of the BT136 is also very less so can be driven by digital circuits.

Since TRIACs are bi-directional switching devices they are commonly used for switching AC applications. To switch off control of an AC load that consumes less than 6 A with a digital device like a microcontroller or microprocessor then BT136 is the best choice. 

Pin Configuration

 Main Terminal 1 (Pin 1) Connected to Phase or neutral of AC mains
Main Terminal 2 (Pin 2) Connected to Phase or neutral of AC mains
Gate (Pin 3) Used to trigger the SCR.


  • It has a highly sensitive gate
  • It is suitable for uses in mains appliance control
  • BT136 is a 4 amp which can be used as like switch for your home electric appliance which is 220 V operated We can use it to control the switch of your fan, led light.


  • AC Light dimmers
  • Strode lights
  • AC motor speed control
  • Noise coupling circuits
  • Controlling AC loads using MCU/MPU
  • Ac/DC Power control
  • Light dimmers
  • Washing machines
  • Motor control
  • Hand tools 


Commutation is not required in AC switching circuits because the TRIAC will not latch on the state since the AC voltage reaches zero for every half cycle.


Type Triac
Non Repetitive On-State Current 27 A
Rated Repetitive Off-State Voltage VDRM 600 V
Off-State Leakage Current @ VDRM IDRM 100 uA
On-State Voltage 1.7 V



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