BT138 Triac 800V 12A TO-220 Package

BT138 Triac 800V 12A TO-220 Package.

The BT138 is a high-performance TRIAC (Triode for Alternating Current) housed in a TO-220 package. It is designed to control AC power in both directions, making it suitable for switching and phase control applications. The device can handle up to 800V of repetitive peak off-state voltage (V_DRM) and a continuous RMS on-state current of 12A, allowing it to operate efficiently in medium-power AC load applications.

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Its sensitive gate design allows easy triggering using low current control signals from microcontrollers, optoisolators, or analog circuits. The BT138 is robust, compact, and widely used in applications such as light dimming, motor speed regulation, and heater control circuits.

Key Features:

• Repetitive peak off-state voltage: 800V
• RMS on-state current: 12A
• Surge current capability: up to 95A (non-repetitive)
• Gate trigger current: 5–35mA (typical)
• On-state voltage drop: around 1.5V at rated current
• Package type: TO-220AB
• Operating temperature: –40°C to +125°C

Applications:

• Light Dimmers – Used in household or industrial light control systems.
• Motor Speed Controllers – Suitable for controlling the speed of AC motors such as fans or drills.
• Heater Control Circuits – Ideal for temperature-regulated appliances and resistive heating elements.
• AC Switching – General-purpose AC load switching (relays, solenoids, pumps).
• Phase Control Applications – Used in AC power regulation and timing circuits.
• Solid-State Relays (SSR) – Acts as the switching element for AC loads.
• Home Appliances – Incorporated in washing machines, vacuum cleaners, and other motor-driven equipment.

BT138 Datasheet

*product image for illustration purposes only. actual product may vary.