STMicroelectronics (ST), a global semiconductor company supporting diverse electronic applications and customers, has launched an octal high-side switch product family featuring robust galvanic isolation, RDS(on) below 260mΩ for energy efficiency, and protection and diagnostic functions for reliability and fault recovery.

The 8-channel switches ISO808, ISO808A, ISO808-1, and ISO808A-1 drive all types of industrial loads—capacitive, resistive, and inductive—with one side connected to ground.

These are typically used in PLCs (Programmable Logic Controllers), industrial PCs, and CNC (Computer Numerical Control) equipment, and are particularly well-suited for applications requiring isolation to strengthen protection functions for sensitive electronic devices in smart factories.

The current limit for ISO808 and ISO808A is 0.7A, while the current limit for ISO808-1 and ISO808A-1 is 1A.

ISO808 and ISO808-1 provide separate input pins for each channel, enabling synchronous operation to drive all outputs simultaneously or direct control.

ISO808A and ISO808A-1 feature serial SPI input and an open-drain Power-Good indicator supporting system management. All switches provide a dedicated fault indicator pin for each channel.

The overload protection function operates independently on each channel, allowing non-overloaded channels to continue operating normally.

All overloaded channels are turned off and automatically restart, enabling quick recovery with minimal host intervention.

Channel and case temperature monitoring detects faults, and when faults persist, the channel is shut down again.

Ground isolation protection for control-side (VDD) and process-side (VCC) power rails, reverse polarity protection, short-circuit protection, case thermal protection, and low-voltage shutdown are also provided.

Communication across the isolation barrier is conducted via RF, maximizing noise integrity. The internal logic reports all data errors, and a watchdog verifies that process-stage outputs are safe when control-side supply voltage is missing.

The performance and functionality of this switch ensure industrial applications meet relevant international standards, including IEC61000 specifications for ESD (Electrostatic Discharge), electrical transients, and power frequency magnetic field integrity. Compliance with UL1577 and UL508 isolation specifications and VDE 0844-11 safety limit requirements is also ensured.

ST's ISO808 product family is pin-compatible with other commonly used switches and offers additional benefits through low RDS(on) and a Power-Good pin for SPI input variants.

The ISO808 product family is supported by an extensive ecosystem and provides additional advantages compared to alternative devices.

Evaluation is accelerated with four X-NUCLEO industrial digital-output expansion cards for STM32 Nucleo development boards (X-NUCLEO-OUT11A1, -OUT12A1, -OUT13A1, -OUT14A1), and easy configuration and control are possible through the STSW-IFAPGUI graphical application.

The ISO808 product family is currently supplied in PowerSO36 package at a price of $5.56 per unit when purchasing 1,000 units.