BT136: A Versatile 4A Triac for Power Control Applications

The BT136 Versatile 4A Triac is a popular triac (triode for alternating current) used extensively in power control applications. This semiconductor device is designed to control AC power in a wide range of devices, including light dimmers, motor speed controllers, and other domestic and industrial electrical equipment. The BT136 is known for its reliability, ease of use, and ability to handle medium power loads, making it a go-to component for many electronic engineers.

Key Features and Specifications

• Type: Triac (4 Quadrant)
• Voltage Rating: 600V
• Current Rating: 4A
• Gate Trigger Voltage (Vgt): 1.5V (maximum)
• Holding Current (Ih): 2.2mA (maximum)
• Surge Current: 25A
• Package: TO-220

Applications

1. Light Dimmers:
   • The BT136 Versatile 4A Triac is widely used in light dimming circuits, where it controls the amount of power delivered to a light bulb, allowing the brightness to be adjusted. By using the BT136 in conjunction with a potentiometer and a diac, users can smoothly control the light intensity in residential or commercial settings.
2. Motor Speed Control:
   • In small motors used in appliances like fans, drills, or kitchen mixers, the BT136 can regulate the motor speed by adjusting the power supplied to the motor. This is achieved by varying the phase angle of the AC signal, enabling precise control over motor operation, which is essential in applications where speed adjustment is required.
3. Heater Control:
   • The BT136 Versatile 4A Triac is also employed in temperature control systems, such as electric heaters. By controlling the power delivered to the heating element, the BT136 allows for accurate temperature regulation, which is vital in applications ranging from household heating systems to industrial ovens.
4. AC Switching:
   • The BT136 can be used to switch AC loads on and off in various applications. Whether it’s controlling the power to a lamp, an appliance, or any other AC-powered device, the BT136 provides a reliable and efficient means of switching, ensuring the connected device operates as intended.
5. Phase Control Applications:
   • In more advanced power control applications, the BT136 is utilized in phase control circuits to manage the power delivered to a load. This technique is commonly used in industrial settings where precise control over power output is necessary, such as in welding equipment or high-power lighting systems.

Advantages of Using BT136

• Robust Design: The BT136 Versatile 4A Triac is designed to handle up to 600V and 4A, making it suitable for medium-power applications where reliability is key.
• Ease of Use: With a low gate trigger voltage and holding current, the BT136 is easy to drive and integrate into a wide range of circuits, requiring minimal external components.
• Versatile Applications: The ability to control power in all four quadrants makes the BT136 suitable for both resistive and inductive loads, providing flexibility in various applications.
• Compact Packaging: Housed in a TO-220 package, the BT136 is compact and easy to mount on a PCB or a heat sink, allowing for efficient thermal management in high-power applications.

Conclusion

The BT136 Versatile 4A Triac is a versatile and reliable component that plays a crucial role in power control applications. Whether you’re designing a light dimmer, a motor speed controller, or any AC switching circuit, the BT136 offers the performance and durability needed to ensure smooth and efficient operation. Its robust design, ease of integration, and wide application range make it a staple in the toolbox of both amateur and professional electronics engineers.

SCR 2P4M for AC power control (Pack of 5)