STのトライアックは、120V~500VのさまざまなAC負荷を駆動可能です。調光器、あらゆるタイプのAC電源オン / オフ・スイッチ、家庭用およびオフィス用コピー機 / プリンタ、産業用モータ・スタータ、SSR、ガーデニング用具、自動灌がいシステム、工場 / ビル / 家庭用のさまざまなオートメーション・コントローラなどにおける回路に活用されています。

  • 産業用3相電源スイッチング・アプリケーション専用の高電圧トライアック
  • スペースに制約のある回路において優れたスイッチング性能を実現し、高いEMI耐性を要するアプリケーションに最適な8Tトライアックおよび高温動作が要求されるアプリケーションを対象とする6Hトライアック8Hトライアック
  • ゲート・ドライブ回路を備え、あらゆる電源オン / オフや位相角スイッチングに対応したパッケージで提供される標準 / スナバレス・トライアック
  • 過電圧保護機能のほか、ソレノイド・アクチュエータやポンプをはじめとする生活家電や灌がいシステム向けの高い誘導性負荷スイッチ機能を備えたACS™ ACスイッチ、および常時通電される生活家電や機器の負荷に合わせて設計されたACSTトライアック


Ease your transition to surface-mount Triacs with our extended D²PAK portfolio

ST further extends its D²PAK offer for Triacs, ideal for compact designs. With parts ranging from 8 to 30 A, this Triac D²PAK offer is particularly suited for home and factory automation, allowing innovative designs with isolated metal substrate (IMS) and direct-bonded copper boards.

Discover our  High-temperature Triacs and  Standard and Snubberless Triacs in D²PAK.

800 V T-series triacs outrun competition for load control

800 V T-series high-performance triacs are designed for AC loads in industrial control and home appliances, enabling innovative and safe AC load control. With immunity (dV/dt) up to twice as high and commutation capability (dI/dt)c up to 5 times as good as state-of-art Triacs, this high-performance 800 V T-series triacs enables circuits to be more robust to EMI and loads to be fully controlled, with no disturbances. Its low gate current down to 10 mA helps optimize the power supply and allows direct drive capability through a single resistance between the microcontroller and Triac. 800 V T-series triacs are housed in TO-220AB, TO-220FPAB and now in D2PAK.



eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.

Power Management Design Center

Thermal-electrical Simulators for Components

Signal Conditioning Design Tool

NFC/RFID Calculators

Choose design tool:

Power Supply Design Tool

SMPS design, by topology, by type and by product
PFC design with analog and digitial control
Supports various PCB configurations
Choose type:

LED Lighting Design Tool

Handles AC-DC and DC-DC design in common topologies
Displays interactive and annotated schematic
Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data
Choose type:

Digital Power Workbench

Provides a step-by-step optimized design of power section and control loop
Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs

Power Tree Designer

Specify input/output power for each node in the tree
Check for consistency
Design each individual node
Choose design tool:

AC Switches Simulator

Select ratings and application waveforms
Get junction temperature and blocking voltage graphs
Search and sort suitable devices

Rectifier Diodes Simulator

Select ratings and application waveforms
Estimate power losses
Search and sort suitable devices


Supports long mission profiles
Provides power loss and temperature graphs
Helps define heatsink thermal properties

Twister Sim

Help select the right ViPOWER Automotive power device
Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis
Supports various PCB configurations

TVS Simulator

Specify system ratings and surge waveform
Search and sort suitable devices


Build simple schematics and firmware inputs in minutes
Quickly generate reliable estimates of battery life, system power consumption and bill of materials costs
Choose design tool:

Active Filters

Handles multi-stage-designs and common topologies
Returns circuit component values
Provides gain, phase and group delay graphs
Low Pass, High Pass and Band Pass


Handles most common configurations
Returns circuit components values
Provides I/O signal waveforms
Inverting, Non Inverting, Window

Low side Current Sensing

Returns circuit component values
Provides current error graphs

High side Current Sensing

Provides current error graphs.
Help to select the right High side current sensing and shunt devices.
Choose design tool:

NFC Inductance

Input geometry and substrate properties
Get antenna impedance

UHF Link Budget

Enter forward and reverse link characteristics
The tool returns link budget estimate

NFC Tuning Circuit

Enter antenna parameter and matching target
Select the topology of the matching network
The tool returns component values for the desired design targets