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Infineon Advanced Solid State Isolators (SSIs)

Increased system life and reduced maintenance downtime costs

Infineon features an extensive lineup of advanced solid state isolators (SSIs) which are developed as a core part of state-of-the-art solid state relays to replace Electromechanical relays (EMRs) and photovoltaic switches.

Infineon’s SSI solid state isolators provide powerful energy transmission over a galvanic isolation barrier, eliminating the need for an isolated power supply to drive gates of MOS-controlled power transistors (CoolMOS™, OptiMOS™, TRENCHSTOP™ IGBT, or CoolSiC™). No dedicated voltage supply is required on the output to drive the power transistor.

Control functions such as fast turn-on / turn-off, overcurrent and over-temperature protection are included to easily and safely build up solid-state relays.


  • Coreless transformer technology
  • Drives latest generation MOSFETs including Infineon CoolMOS™ S7, OptiMOS™ linear FETs and TRENCHSTOP™ IGBT
  • Fast turn-on and turn-off
  • Overcurrent, overtemperature protection
  • Dynamic Miller Clamping


  • No isolated bias supply required for gate driving
  • Lower power dissipation leads to elimination of heat sink
  • 75% less power consumption compared to EMRs
  • Switch and system level protection
  • No moving parts means increased system life and reduced maintenance and downtime costs associated with contact failure, mechanical strain or corrosion
  • Meets UL 1577 and IEC 60747-17


  • Robotics
  • Industrial automation
  • Programmable logic controller


  • Smart building
  • Power supplies
  • Power transmission & distribution
  • Battery management systems

Infineon SSI products provide protection features that enable designing reliable, long-living and robust solid-state relays. Solid state isolators provide numerous benefits over EMRs including increased reliability and protections.

Evaluation Boards

The EVAL-iSSI30R11H and EVAL-iSSI30R12H evaluation boards are intended for quickly evaluating the product features of and beginning design work with Infineon’s SSI solid state isolators in an application circuit. The EVAL-iSSI30R11H features the iSSI30R11H and two CoolMOS™ IPQC60R010S7 MOSFETs, and the EVAL-iSSI30R12H features the iSSI30R12H and two CoolMOS™ IPT60T022S7 MOSFETs, each in an AC switch configuration.