STのACSトライアック（ACST）はトライアックとして機能しますが、過渡電圧クランプ機能と吸収機能が強化されています。
負荷整流が生成する過渡電圧や、IEC 61000-4-5に記述されているようなACラインに起因する過渡電圧は、いずれもデバイスとシステムがうまく吸収します。ACSTのクランプおよびクローバ機能によって、システムとACSTにとって安全な過渡動作が保証されます。したがって、MOVやスナバ回路が不要になり、回路が簡素化されます。
これらのデバイスには800Vのブロック機能があり、標準またはロジック･レベルのゲートを選択できます。
これらは、Fullpack、IPAK、DPAK、D²PAK、またはI²PAKパッケージで提供されます。
注目ビデオ
Increase immunity and reduce BOM with new 800 V AC switch
Drive loads subjected to high AC line spikes and transients with ST’s new logic-level ACST310; a 3 A, 800 V overvoltage-protected AC switch. Its high-voltage robustness and surge voltage capabilities prove its reliability in low-power appliance systems, and saves PCB space as any MOV protection or RC network can be removed. Available in two package versions, the ACST310-8B in DPAK and the ACST310-8FP in a 2kV UL1557-certified TO-220FPAB, it allows any standard microcontroller to drive resistive or inductive loads up to 250 W.
eDesignSuite
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 Management Design Center
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: DC/DC AC/DC 太陽光発電システム
Power Management Design Center
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: DC/DC AC/DC
Power Management Design Center
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 Management Design Center
Power Tree Designer
• Specify input/output power for each node in the tree
• Check for consistency
• Design each individual node
Choose design tool: 
Thermal-electrical Simulators for Components
AC Switches Simulator
• Select ratings and application waveforms
• Get junction temperature and blocking voltage graphs
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Rectifier Diodes Simulator
• Select ratings and application waveforms
• Estimate power losses
• Search and sort suitable devices
Thermal-electrical Simulators for Components
STPOWER Studio
• Supports long mission profiles
• Provides power loss and temperature graphs
• Helps define heatsink thermal properties
Thermal-electrical Simulators for Components
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
Thermal-electrical Simulators for Components
TVS Simulator
• Specify system ratings and surge waveform
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Estimate
• 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: 
Signal Conditioning 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
Signal Conditioning Design Tool
Comparators
• Handles most common configurations
• Returns circuit components values
• Provides I/O signal waveforms
• Inverting, Non Inverting, Window
Signal Conditioning Design Tool
Low side Current Sensing
• Returns circuit component values
• Provides current error graphs
Signal Conditioning Design Tool
High side Current Sensing
• Provides current error graphs.
• Help to select the right High side current sensing and shunt devices.
Choose design tool: 
NFC/RFID Calculators
NFC Inductance
• Input geometry and substrate properties
• Get antenna impedance
NFC/RFID Calculators
UHF Link Budget
• Enter forward and reverse link characteristics
• The tool returns link budget estimate
NFC/RFID Calculators
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