BT137 600V 8A Thyristor TRIAC TO-220

BT137 600V 8A Thyristor TRIAC TO-220 is a bidirectional semiconductor switch commonly used for AC power control applications such as dimmers, fan speed controllers, and switching circuits. It allows current flow in both directions when triggered, making it suitable for full AC wave control. Its TO-220 package enables efficient heat dissipation and easy mounting to heat sinks.

Key Features:

• High Voltage Rating: Supports blocking voltages up to 600V.
• High Current Handling: Can conduct up to 8A continuous load current.
• Sensitive Gate: Requires low gate current for triggering.
• Bidirectional Control: Controls both halves of the AC cycle.
• TO-220 Package: Compatible with heatsinks for better thermal performance.

Technical Specifications:

• Peak Repetitive Off-State Voltage (V_DRM): 600V
• RMS On-State Current (I_T(RMS)): 8A
• Peak Non-Repetitive Surge Current (I_TSM): 65A (t = 20ms)
• Gate Trigger Current (I_GT): 5 to 25mA depending on quadrant
• Gate Trigger Voltage (V_GT): 0.7V to 1.5V
• Holding Current (I_H): 4 to 15mA
• On-State Voltage (V_TM): Max 1.7V at 8A

Mechanical Specifications:

• Package Type: TO-220
• Leads: 3-pin leads: MT1, MT2, Gate
• Case Material: Molded epoxy with metal tab
• Mounting: Hole for screw mount on heat sink
• Dimensions: Standard TO-220 footprint (10.0mm × 15.0mm × 4.7mm approx.)

Mounting Options:

• Through-Hole Mounting: Suitable for power boards and AC modules.
• Heatsink Compatible: Mountable with thermal paste and screw for enhanced dissipation.

Schematic Diagram, Connection, Wiring and Pinout:

• Pin Configuration: Pin 1 – MT1, Pin 2 – MT2, Pin 3 – Gate
• Wiring: Connect Gate to control signal, MT1 to load, and MT2 to AC line.
• Operation: Fires when gate is triggered and voltage is applied across MT1-MT2.

Datasheet and Documentation:

• Download BT137 Datasheet (PDF)

Applications:

• Light Dimmers: Used to control the brightness of incandescent and resistive loads.
• Fan Speed Controllers: Efficiently adjust AC motor speed.
• AC Switches: Replaces relays in compact control circuits.
• Heater Controls: Used in electric ovens, toasters, and irons.
• Phase Control: For soft start and power management in industrial tools.

Equivalent Models:

• BTA08: TRIAC with insulated tab, similar current and voltage specs
• MAC97A8: For low power TRIAC applications
• BT138: Higher current version of BT137 rated at 12A
• TIC206: General-purpose TRIAC for medium power control

Package Includes:

• 1 x BT137 600V 8A Thyristor TRIAC TO-220