Solid-state relays

Eliminate moving parts to achieve higher system reliability with integrated power and signal isolation

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Our integrated solid-state relay (SSR) portfolio of basic and reinforced isolated switches and drivers forms a complete isolated solid-state relay solution with no moving parts. Using industry-leading capacitive and magnetic isolation technology, our SSRs accept a low-power input from a controller IC and produce the appropriate high-current gate drive for an internal or external power switch, such as a MOSFET, IGBT, silicon carbide (SiC) MOSFET or silicon control rectifier (SCR). Our SSRs generate their own secondary bias supply, eliminating the need for an external isolated power supply.

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Isolated switch driver (external FET)

Control external power switches (MOSFET, IGBT, SiC and SCR) through an isolation barrier.

Isolated switch (internal FET)

Control integrated high-voltage MOSFETs (up to 1.4 kV, 50 mA) through an isolation barrier.

Related categories
Isolation

Learn more about our complete portfolio of isolation products.

Find your solid-state relay

TPSI3050 NEW

Isolated switch driver with integrated 10-V gate supply

Approx. price (USD) 1ku | 1.69
TPSI3050-Q1 NEW

Automotive reinforced isolated switch driver with integrated 10-V gate supply

Approx. price (USD) 1ku | 1.99
TPSI3052 NEW

Isolated switch driver with integrated 15-V gate supply

Approx. price (USD) 1ku | 2.1
TPSI3052-Q1 NEW

Automotive reinforced isolated switch driver with integrated 15-V gate supply

Approx. price (USD) 1ku | 2.49
TPSI2140-Q1 NEW

Automotive 1200-V, 50-mA, isolated switch with 2-mA avalanche rating

Approx. price (USD) 1ku | 2.75

Benefits of our solid-state relays

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Higher system reliability & best-in-class isolation

Reduce the number of moving parts in your design and enable basic isolation up to 3.75 kVrms and reinforced isolation up to 5 kVrms.

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Integrated power & signal isolation

Reduce your solution size and cost with our solid-state relays which integrate the power and signal transfer over an isolation barrier in a single chip.

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High accuracy for improved system safety

Detect insulation faults quickly and with higher accuracy by pairing our solid-state relays with a battery monitor in 800-V battery management systems.

Technical resources

Technical article
Technical article
How to achieve higher-reliability isolation and a smaller solution size with solid-state relays
Learn about the drawbacks of mechanical- and optical-based isolation, and how these can be overcome with isolated switches and drivers to increase reliability while reducing solution size and cost in high-voltage systems.
Application note
Application note
Why Pre-Charge Circuits Are Necessary in High Voltage Systems
Learn how the TPSI3050-Q1 isolated switch driver combined with external FETs creates a solid-state relay (SSR) solution that can replace the mechanical precharge contactor while improving power density.
document-pdfAcrobat PDF
Application note
Application note
Cascoding Two TPSI3050 Isolated Switch Drivers to Increase Gate Drive Voltage
Learn how to select the right gate-drive voltage for power transistors (Si MOSFETs, IGBTs, SiC MOSFETs), and how to use two TPSI3050 isolated switch drivers to achieve higher efficiency when driving certain power transistors.
document-pdfAcrobat PDF

Discover featured applications

HEV/EV battery management system (BMS)
Isolated switches and drivers for insulation resistance monitoring in high-voltage battery packs
HEV/EV inverter & motor control
Isolated switches and drivers for traction inverters used in EVs for energy recapture in regenerative braking
Factory automation & control
Isolated switches and drivers for factory automation in programmable logic controller (PLC) applications
EV charging infrastructure
Isolated switches and drivers for EV charging stations
Solar energy
Isolated switches and drivers for solar energy management and storage

Isolated switches and drivers for insulation resistance monitoring in high-voltage battery packs

Enable highly accurate monitoring and control over high-voltage battery stacks. Our integrated solid-state relays and resources help you create designs for battery pack-passive balancing, battery disconnect unit, battery control unit and wired cell supervisor circuit. Battery pack-passive balancing designs often require:

  • Resolution of voltage and temperature measurement on cell level
  • Accurate current sense on pack level

Featured resources

REFERENCE DESIGNS
  • TIDA-010232 – AFE for insulation monitoring in high-voltage EV charging and solar energy reference design
  • TIDA-050058 – Zero-cross switching for solid-state relays reference design
  • TIDA-050059 – Overcurrent and overtemperature protection for solid-state relays reference design
PRODUCTS
  • TPSI2140-Q1 – Automotive 1200-V, 50-mA, isolated switch with 2-mA avalanche rating
  • TPSI3052-Q1 – Automotive reinforced isolated switch driver with integrated 15-V gate supply
  • TPSI3050-Q1 – Automotive reinforced isolated switch driver with integrated 10-V gate supply

Isolated switches and drivers for traction inverters used in EVs for energy recapture in regenerative braking

Our integrated circuits and reference designs allow you to create traction inverter high and low voltage designs that efficiently convert DC power to alternating phases of power to drive multi-phase motors.

Traction inverter high and low voltage designs require:

  • Safely and efficiently control and protect the power switch (IGBT/SiC)
  • Position sensing of the motor shaft (resolver replacement)
  • Following state-of-the-art architecture regarding system redundancy in order to allow implementation of the system on the highest safety level

Featured resources

REFERENCE DESIGNS
  • TIDA-010232 – AFE for insulation monitoring in high-voltage EV charging and solar energy reference design
  • TIDA-050058 – Zero-cross switching for solid-state relays reference design
  • TIDA-050059 – Overcurrent and overtemperature protection for solid-state relays reference design
PRODUCTS
  • TPSI3050-Q1 – Automotive reinforced isolated switch driver with integrated 10-V gate supply
  • TPSI3052-Q1 – Automotive reinforced isolated switch driver with integrated 15-V gate supply
  • TPSI2140-Q1 – Automotive 1200-V, 50-mA, isolated switch with 2-mA avalanche rating

Isolated switches and drivers for factory automation in programmable logic controller (PLC) applications

Our integrated circuits and reference designs enable you to build PLC equipment such as digital output module, enabling low-side and high-side driving capabilities, push-pull high frequency outputs known as pulse train output (PTO), inductive loads, isolation and protection.

Digital output module designs often require:

  • Highly-efficient isolated power supply.
  • Advanced protection and diagnostics.

Featured resources

REFERENCE DESIGNS
  • TIDA-050058 – Zero-cross switching for solid-state relays reference design
  • TIDA-050059 – Overcurrent and overtemperature protection for solid-state relays reference design
PRODUCTS
  • TPSI3050 – Isolated switch driver with integrated 10-V gate supply
  • TPSI3052 – Isolated switch driver with integrated 15-V gate supply
  • TPSI3052-Q1 – Automotive reinforced isolated switch driver with integrated 15-V gate supply

Isolated switches and drivers for EV charging stations

Our integrated circuits and reference designs help you create smarter and more efficient power modules that can charge electric vehicles (EVs). Whether it is a power factor correction (PFC) stage or a DC/DC power stage design, we have the right circuits to design an efficient power module.

DC fast charging power module designs require expertise to enable accurate sensing and control of power output.

Featured resources

REFERENCE DESIGNS
  • TIDA-010232 – AFE for insulation monitoring in high-voltage EV charging and solar energy reference design
  • TIDA-050058 – Zero-cross switching for solid-state relays reference design
  • TIDA-050059 – Overcurrent and overtemperature protection for solid-state relays reference design
PRODUCTS
  • TPSI2140-Q1 – Automotive 1200-V, 50-mA, isolated switch with 2-mA avalanche rating
  • TPSI3052-Q1 – Automotive reinforced isolated switch driver with integrated 15-V gate supply
  • TPSI3050-Q1 – Automotive reinforced isolated switch driver with integrated 10-V gate supply

Isolated switches and drivers for solar energy management and storage

Our integrated circuits and reference designs help you accelerate development of solar string inverters, improving power density and efficiency while providing real-time communication and monitoring.

String inverter designs require innovative technology to achieve:

  • Long system lifespan
  • Low output distortion
  • Accurate analog measurement of voltage and current
  • High efficiency and power density

Featured resources

REFERENCE DESIGNS
  • TIDA-010232 – AFE for insulation monitoring in high-voltage EV charging and solar energy reference design
  • TIDA-050058 – Zero-cross switching for solid-state relays reference design
  • TIDA-050059 – Overcurrent and overtemperature protection for solid-state relays reference design
PRODUCTS
  • TPSI3050 – Isolated switch driver with integrated 10-V gate supply
  • TPSI3052 – Isolated switch driver with integrated 15-V gate supply
  • TPSI2140-Q1 – Automotive 1200-V, 50-mA, isolated switch with 2-mA avalanche rating

Design & development resources

Reference design
Overcurrent and overtemperature protection for solid-state relays reference design

This reference design shows how to achieve overcurrent and overtemperature protection for a solid-state relay. The reference design features the TPSI3050-Q1 5-kVRMS reinforced isolated switch driver. TPSI3050-Q1 device integrates a laminate transformer to achieve isolation while transferring signal (...)

Reference design
Zero-cross switching for solid-state relays reference design

This reference design shows how to achieve zero-cross switching (ZCS) with a solid-state relay. The reference design features the TPSI3050-Q1 isolated switch driver. TPSI3050-Q1 device integrates a laminate transformer to achieve isolation while transferring signal and power to the secondary side. (...)

Reference design
AFE for insulation monitoring in high-voltage EV charging and solar energy reference design
This reference design features an electric bridge DC insulation monitoring (DC-IM) method which allows an accurate symmetrical and asymmetrical insulation leakage detection mechanism and an isolation resistance detection mechanism. We present a new generation of isolated amplifiers and switchers (...)