New isolated smart switches drive any load in harsh industrial environments

09-09-2019 | Silicon Laboratories Inc | Connectors, Switches & EMECH

Silicon Labs has launched a family of compact, robust isolated smart switches created to drive any load, even in the harshest industrial environments. The new Si834x isolated switches are perfect for driving resistive and inductive loads including solenoids, relays and lamps employed in industrial control systems including PLCs, I/O modules, relay drivers and servo motor controllers. Each switch is galvanically-isolated for safety using the company's groundbreaking CMOS-based isolation technology, providing better reliability and performance than legacy optocoupler-based isolation, incorporating high CMTI of more than 100kV/µs.


The isolated switch family supports high-side and low-side switch options, low on-resistance (145mOhm RON), up to 700mA of continuous current compliant with the IEC 61131-2 standard, comprehensive protection and diagnostic reporting, and advanced configuration, monitoring and control for industrial automation systems. The switch logic interface can be as uncomplicated as four low-power CMOS digital inputs or as rich and flexible as a full SPI capable of controlling up to 128 channels with four MCU pins.


“The new Si834x isolated smart switch family embodies three generations of Silicon Labs’ isolation innovation for industrial automation,” said Brian Mirkin, vice president and general manager of Silicon Labs’ power products. “The Si834x family expands our broad isolator portfolio, complementing our PLC input isolators and isolated FET drivers to provide a complete solution. The Si834x switches outperform optoisolators, power FETs and other competing options by offering a fully integrated 24V digital output solution with best-in-class switch protection, flexible configuration and comprehensive diagnostic feedback.”

Related product news