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A TRIAC (triode for alternating current, also known as bidirectional triode thyristor or a bilateral triode thyristor) is a silicon semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a subset of thyristors (read more in our [thyristor guide](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/thyristors-guide)) and are similar to SCRs (silicon controlled rectifiers). However, unlike SCRs and other thyristors, which are unidirectional, the TRIAC is able to control current over both halves of the sine wave, making TRIACs bidirectional. A TRIAC is a 4-layer silicon component that is PNPN in the positive direction and NPNP in the negative direction. The devices come in panel mount, surface mount, and through-hole mounting options in various package types to suit a wide variety of electronics applications and circuits.RS have a curated range of TRIACs from a multitude of trusted brands, including Littelfuse, STMicroelectronics, WeEn Semiconductors Co., and many more.

**How does a TRIAC work?**

In basic terms, a TRIAC is a low-to-medium power semi-latching solid-state switch. The device acts like two standard thyristors inversely connected in parallel or back to back. To activate the component a voltage needs to be applied to the gate terminal, and TRIACs can be triggered by either negative or positive voltages, whereas SCRs require a positive voltage. Once the gate current is triggered, a TRIAC will continue to conduct even if the supply to the gate is removed.

On a TRIAC symbol, there are three terminals. These terminals are:

- MT1 Anode 1 (Main Terminal 1)
- MT2 Anode 2 (Main Terminal 2)
- Gate Terminal

You can learn more about [how TRIACs work](/web/content/discovery/ideas-and-advice/how-triacs-work) in our guide.

**What are TRIACs used for?**

TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmer switches, as they enable the utilisation of each half-cycle of the AC wave. The solid-state device can be used in a circuit as a simple on-off device in a wide range of electronic applications. Some of the more common areas are:

- Temperature control
- Liquid level control
- Dimmers for domestic lighting
- Small motor control
- Speed control for electric fans


Shop our TRIACs. This semiconductor is also known as a bidirectional triode thyristor. Browse our Triac offer available. Free Next Day Delivery. 

TRIAC | Thyristor | Triode | RS

TRIACs

Littelfuse Surface Mount TRIAC Gate Trigger 1.3V 400V

Littelfuse Through Hole TRIAC Gate Trigger 1.5V 800V

Littelfuse Surface Mount TRIAC Gate Trigger 1.3V

Littelfuse Surface Mount TRIAC Gate Trigger 2.5V 800V

Littelfuse Surface Mount TRIAC Gate Trigger 2V 600V

Littelfuse Surface Mount TRIAC Gate Trigger 1.3V 800V

Littelfuse Through Hole TRIAC Gate Trigger 1.7V 800V

Buy from our selection of triacs from Electronica. At RS, we strive to give you the best offers from our supplier and to promptly deliver in the shortest time.

Electronica Triacs | RS Components

Buy from our selection of triacs from Littelfuse. At RS, we strive to give you the best offers from our supplier and to promptly deliver in the shortest time.

Littelfuse Triacs

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