Triac BT138 12A 600V TO-220
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Prices updated: 12 Oct 2026
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About this product
A 12 A, 600 V bidirectional triac from NXP in a TO-220 package, used to switch AC loads with a gate trigger pulse. It is suited to lamp dimmers, fan speed control and heater switching on mains circuits. Add a snubber for inductive loads.
Specifications
- Type
- Triac (bidirectional AC switch)
- Max RMS on-state current
- 12 A
- Repetitive peak off-state voltage
- 600 V
- Package
- TO-220
- Pinout
- 1 = MT1, 2 = MT2, 3 = Gate
Frequently asked questions
How should the gate be driven safely?
Drive the gate through an isolated circuit such as an optocoupler (MOC3021 or MOC3041) with a series gate resistor, referenced to MT1. Keep the microcontroller and its power supply isolated from the mains side.
What current rating should I choose?
Choose a triac whose RMS on-state current rating is above the maximum current of your load, with a margin. A 12 A triac suits loads up to a few kilowatts on 220 V, but check the derating and heatsink requirements for your application.
