Triac BT136 4A 600V TO-220
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Prices updated: 12 Oct 2026
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About this product
A 4 A, 600 V bidirectional triac from NXP in a TO-220 package, used for switching small AC loads with a gate trigger pulse. It is a common choice for low-power lamp dimmers, small fan control and hobby mains projects. Use isolation and a snubber as needed.
Specifications
- Type
- Triac (bidirectional AC switch)
- Max RMS on-state current
- 4 A
- Repetitive peak off-state voltage
- 600 V
- Package
- TO-220
- Pinout
- 1 = MT1, 2 = MT2, 3 = Gate
Frequently asked questions
What is the pinout of the BT136 in TO-220 package?
Pin 1 is MT1, pin 2 is MT2 (also connected to the metal tab), and pin 3 is the Gate. Verify the orientation against the datasheet before soldering.
Can I control a mains lamp with a microcontroller using this triac?
Only with proper isolation. Use an optocoupler such as MOC3021 or MOC3041 with a gate resistor, keep the microcontroller and its supply isolated from mains, and enclose the mains section safely.
