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Galvanic Isolated Octal High-Side Power Solid State Relay with SPI Interface for High Inductive Loads

Octal High-Side Power Solid State Relay
Octal High-Side Power Solid State Relay

STMicroelectronics has launched a family of octal high-side switches that combine galvanic isolation for robustness, RDS(on) below 260mΩ for energy efficiency, and protection and diagnostics for reliability and fault recovery. The new 8-channel switches, ISO808ISO808AISO808-1, and ISO808A-1, drive all types of industrial loads with one side connected to ground and are suitable for programmable logic controllers (PLC), industrial PCs, and computer numerical control (CNC) machines, especially where isolation is needed to increase protection for sensitive smart-factory electronics.


The performance and features of these switches help ensure industrial applications meet applicable international standards including IEC 61000 specifications for electrostatic discharge (ESD), electrical transients, and power-frequency magnetic-field immunity. The ISO808 and ISO808A have a current limit of 0.7A, while the ISO808-1, ISO808A-1 have a limit of 1A. The ISO808 and ISO808-1 provide a separate input pin for each channel and allow either direct control or synchronous operation driving all outputs simultaneously. The ISO808A and ISO808A-1 have a serial SPI input and feature an open-drain power-good (Pgood) indicator to aid system management. 



  • Low process and logic sides supply current

  • Under-voltage shut down with auto restart and hysteresis

  • Logic side 5 V and 3.3 V TTL/CMOS and MCU compatible I/Os

  • Common output enable/disable pin

  • Reset function for IC outputs disable

  • High common mode transient immunity

  • Short circuit protection on output channels

  • Per-channel over-temperature protection with thermal independence of separate channels

  • Case over-temperature protection

  • Over-voltage protection (VCC clamping)

  • Loss of GND and VCC protections

  • Common fault open drain diagnostic



  • Programmable logic control

  • Industrial PC peripheral input/output

  • Numerical control machines

  • Drivers for all type of loads (resistive, capacitive, inductive)


Availability & Pricing

The ISO808 family is available now, housed in a PowerSO36 package, priced from $5.56 for orders of 1000 pieces.

Component Datasheet

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