TRIACs are a subset of thyristors (analogous to a relay in that a small voltage and current can control a much larger voltage and current) and are related to silicon controlled rectifiers (SCRs). TRIACs differ from SCRs in that they allow current flow in both directions, whereas an SCR can only conduct current in a single direction.

TRIAC为三端元件，其三端分别为 T1 (第二 端子 或第二阳极)， T 2 (第一端子或第一阳极)和 G (控制极)亦为一闸极控制开关，与SCR最大的不同点在于TRIAC无论于正向或反向电压时皆可导通，其符号构造及外型，如图1所示。

Sensitive TRIACs open and close low-voltage digital control circuits. Standard TRIACs ensure the continuous flow of alternating current. Alternistor TRIACs handle high-speed switching tasks that produce large inductive loads. Each TRIAC produced by Littelfuse comes in sensitive, standard, and alternistor versions.

8H系列Triac基于意法半导体的新技术，能够在800V和150°C条件下工作而不影响性能。 这使得8H的双向可控硅成为在高温密闭电子环境下运行的正确选择，也提高了系统的可靠性。

2012年2月24日 · A TRIAC is defined as a three-terminal AC switch that can conduct in both directions, unlike other silicon controlled rectifiers. It can conduct whether the applied gate signal is positive or negative, making it ideal for AC systems.

2024年9月18日 · Triacs are three-terminal silicon devices that are configured in an inverse parallel arrangement to provide load current during both halves of the AC supply voltage. They have two anodes (A1 and A2) for conducting current in both directions. They also have two gates (G1 and G2), each of which triggers a corresponding anode.

2024年11月25日 · Learn how TRIACs work to efficiently control AC power in various applications, with practical examples like light dimming and motor speed adjustment.

2021年1月27日 · A TRIAC is a bidirectional, three-electrode AC switch that allows electrons to flow in either direction. It is the equivalent of two SCRs connected in a reverse-parallel arrangement with gates connected to each other. A TRIAC is triggered into conduction in both directions by a gate signal like that of an SCR.

2024年11月25日 · TRIAC can be expanded as a Triode Alternating Current. TRIAC is used to control AC power because once turned on, a TRIAC can conduct in both directions, unlike other transistors like MOSFET or IGBT. The TRIAC is a three-terminal semiconductor switching device that includes a Main Terminal 1, Main Terminal 2, and a gate Terminal.

Diacs, Triacs and Thyristers