Isolated Smart Switches Drive Any Load


The new Si834x isolated switches are ideal for driving resistive and inductive loads such as solenoids, relays and lamps used in industrial control systems including programmable logic controllers (PLCs), I/O modules, relay drivers and servo motor controllers.


Each switch is galvanically isolated for safety using Silicon Labs’ CMOS-based isolation technology, offering better reliability and performance than legacy optocoupler-based isolation, including high common-mode transient immunity (CMTI) of more than 100kV/µs.


The Si834x isolated switch family supports high-side and low-side switch options, low on-resistance (145mΩ 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 simple as four low-power CMOS digital inputs or as rich and flexible as a full serial peripheral interface (SPI) capable of controlling up to 128 channels with four MCU pins.

  • High-side or low-side switch
  • Logic Supply: 2.25 V – 5.5 V
  • Switch Supply: 9 V – 32 V
  • Fast (10 µs) update rate
  • High continuous current (700 mA) and low RON (145 mΩ)
  • Unique multi-voltage output clamp : Unlimited demagnetization (EAS) / Efficient and fast turn-OFF
  • Inrush Current Mode: 8 A for 20 ms
  • Current-limited overload protection
  • Over-temperature protection
  • Undervoltage protected supplies
  • Up to 8 different diagnostics/ Multiple power supply reports /Over-current, over-temperature/Open-circuit warning/Communication error
  • Channel status indicators
  • Dedicated fault indicator
  • Disable outputs asynchronously
  • Control 128 channels via SPI
  • 1.5 kVRMS safety rated isolation
  • Transient immunity > 100 kV/μs
  • Compliant to IEC 61131-2
  • Compact 9×9 DFN-32 package
  • 5 kV ESD Protection
  • -40 – 125 ˚C operating temperature

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Ref. nummer
Alcom Electronics
Silicon Labs
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