BT136 (TRIAC 4A 600V)

Since TRIACS deal with AC voltages, the circuit involving them has to be designed properly to aboid problem some tips are shared below

• All TRIAC circuits suffer from an effect called Rate Effect. This occurs when the TRIAC is switching frequently and a sudden high voltage occurs at either main terminal of the TRIAC and damages the TRIAC itself. It can be avoided by using a snubber circuit.
• Similarly there is another effect called backlash effect. This occurs due to the capacitance that gets accumulated between the two terminals of the MT1 and MT2 of the TRIAC. Due to this the TRIAC will not turn on even if the gate voltage is applied. This problem can be solved by providing a resistance in series for the capacitance to discharge.
• When controlling the output AC voltage for dimmer or speed control applications a Zero crossing method is always recommended to be used.
• In switching circuits the TRIAC is easily subjected to harmonics and EMI interference hence should be isolated from other digital electronics.
• There is chance of backward current when the TRIAC is switching inductive loads, so an alternate discharge path has to be provided for the load to drain the inrush current.

Applications

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

Features

• Maximum Terminal current: 4A
• On-state Gate voltage: 1.4V
• Gate trigger current: 10mA
• Max Terminal Voltage is 600 V
• Holding current: 2.2mA
• Latching current: 4mA
• Available in To-220 Package