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Thyristors (SCR)

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Featuring immunity to surges and transients in static states and commutations, our silicon-controlled rectifiers (SCR), also known as thyristors, are ideal for single- and three-phase power line networks, even in harsh environments up to 150°C. Thyristors (SCR) belong to our STPOWER family.

In addition to AC, DC and capacitive ignitor circuits, these unidirectional switches are found in high-voltage industrial circuits as well as automotive equipment and all other segments where electromechanical relays are not operative or unreliable.

Whenever a bidirectional switch function is needed at 20 A and more, a back-to-back SCR configuration will work with no compromise on the function/immunity.    

         

An even simpler bidirectional AC power line switch is also available.

Featuring immunity to surges and transients in static states and commutations, ST silicon-controlled rectifiers (SCR), or thyristors, are ideal for single- and three-phase power line networks, even in harsh environments up to 150°C.

ST offers a broad range of thyristors (SCRs) with RMS current varying from 0.25 A for sensitive applications to 130 A for high-power applications.

These unidirectional switches are used in various industrial applications, along with AEC-Q101 qualified thyristors for automotive environments.

Thyristors are also used in segments where electromechanical relays are not viable or reliable. They can completely replace relays or improve their reliability and control through hybrid solutions.

When bidirectional functionality is required, back-to-back SCR configurations perform with no compromise to the function and immunity of applications.

An even simpler bidirectional AC power line switch is also available.

Applications

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Home appliances
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Air conditioning
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Automotive
Industrial AC motor icon
Industrial AC motors
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Telecom, servers & UPS

Product types

Logic-level gate
Logic-level gate thyristors are designed to be driven directly by low current levels, making them easy to integrate into modern digital circuits. They offer fast turn-on and optimized performance, making them suitable for low-power applications requiring simple gate drive functionality.
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Standard 150°C
Standard 150°C series thyristors are rated to operate reliably at junction temperatures up to 150°C, providing a balanced combination of thermal robustness and electrical performance.
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High Temperature 150°C
High Temperature 150°C thyristors are optimized for harsh thermal environments, offering enhanced heat dissipation capabilities and maintaining stable performance at 150°C.
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Featured Products

High-temperature, low gate current SCRs

Enhance reliability in motorcycles and industrial applications

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Supported Devices

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

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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
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DC/DC
AC/DC
Solar Battery Charger

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
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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

PCB Thermal Simulator

• Thermal analysis of a PCB from Gerber files.
• Possibility to add heat sources, heat sinks, copper areas and thermal paths.
• Powerful server-side engine for rendering and simulation.
• Thermal results shown graphically via 2D table.

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

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
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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
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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.
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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

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