How to Use BT136 600: Examples, Pinouts, and Specs

The BT136 600 is a TRIAC (Triode for Alternating Current) designed for switching and phase control applications. It can handle a maximum voltage of 600V and is commonly used in light dimmers, motor speed controls, and other AC switching applications. This versatile component is ideal for controlling AC loads in various electronic projects.

1. Identify the Pins: Ensure you correctly identify the MT1, MT2, and Gate pins.
2. Connect MT2 to Load: Connect the MT2 pin to one end of the AC load.
3. Connect MT1 to AC Source: Connect the MT1 pin to the AC source.
4. Gate Triggering: Use a small current (typically 5mA) to trigger the Gate pin. This can be done using a microcontroller like an Arduino UNO.

• Heat Dissipation: Ensure proper heat dissipation by using a heatsink if necessary, especially for high current applications.
• Isolation: Maintain electrical isolation between the control circuit and the AC load to prevent damage and ensure safety.
• Snubber Circuit: Use a snubber circuit (a resistor-capacitor network) across the TRIAC to protect against voltage spikes and ensure reliable operation.

/*
 * Example code to control a BT136 600 TRIAC using an Arduino UNO.
 * This code will turn on an AC load connected to the TRIAC.
 */

const int gatePin = 9; // Pin connected to the Gate of the TRIAC

void setup() {
  pinMode(gatePin, OUTPUT); // Set the gate pin as an output
}

void loop() {
  digitalWrite(gatePin, HIGH); // Trigger the TRIAC
  delay(1000); // Keep the load on for 1 second
  digitalWrite(gatePin, LOW); // Turn off the TRIAC
  delay(1000); // Keep the load off for 1 second
}

1. TRIAC Not Triggering:

   • Solution: Ensure the Gate current is sufficient (at least 5mA). Check the connections and verify the control signal from the microcontroller.

2. Overheating:

   • Solution: Use a heatsink to dissipate heat. Ensure the load current does not exceed the maximum rating of 4A.

3. Unstable Operation:

   • Solution: Implement a snubber circuit across the TRIAC to protect against voltage spikes and ensure stable operation.

Q1: Can I use the BT136 600 for DC applications?

• A1: No, the BT136 600 is designed for AC applications only. For DC switching, consider using a MOSFET or a relay.

Q2: What is the purpose of the snubber circuit?

• A2: A snubber circuit protects the TRIAC from voltage spikes and ensures reliable operation by preventing false triggering.

Q3: How do I calculate the required heatsink size?

• A3: The required heatsink size depends on the power dissipation and ambient temperature. Use the thermal resistance (junction-to-ambient) and power dissipation to calculate the heatsink's thermal resistance.

By following this documentation, you should be able to effectively use the BT136 600 TRIAC in your AC switching and phase control applications.