Si834x Isolated Smart Switch

The Si834x provides four isolated high-side or low-side switches with low ON state switch resistance. These switches are ideal for driving resistive and inductive loads like solenoids, relays, and lamps commonly found in industrial control systems like programmable logic controllers (PLC). Each switch is galvanically isolated for safety using Silicon Labs’ groundbreaking CMOS based isolation technology. 
The switches are capable of providing up to .5A of IEC61131-2 compliant continuous current in a quad channel configuration. Each switch has many built- in protection features making them extremely robust and flexible load drivers. Each switch is protected against over-current, over-voltage from demagnetization (inductive kick or flyback voltage,) and over-temperature conditions. Additionally, each switch can detect an open-circuit condition. An innovative multi-voltage Smart Clamp is used to efficiently handle an unlimited amount of demagnetization energy (EAS). The over-current protection includes an innovative Inrush Current Mode on select products which allows the switch to drive challenging loads like lamps and DC motors. Additionally, the device power supplies are monitored, and the switches are safely constrained or shutdown if a fault is detected. 

View the current datasheet errata


  • 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 & low RON
    • 4 channels: 700 mA (145 mΩ)
  • Unique multi-voltage output clamp
    • Unlimited demagnetization (EAS)
    • Efficient and fast turn-OFF
  • Inrush Current Mode: 7 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 9x9 DFN-32 package
  • 5 kV ESD Protection
  • -40 – 125 ˚C operating temperature

Get Started with Si834x Isolated Smart Switches

Si834x Isolated Smart Switch Evaluation Kits

Start development using either high-side switches (Si83404AAA-KIT) or low-side switches (Si83414AAA-KIT) quickly with advanced evaluation boards.  Both options highlight 4-channel, parallel input interface isolated smart switches.

View Kits

Si834x Product Matrix

Part Number Data Sheet Dev Kit Output Type Input Type Continuous Output Current Indicator Outputs Isolation Rating
Si83404AAA-KIT Sourcing Parallel 0.7 Output Status and Low Voltage 1.5 kVrms
Si83408ADA-KIT Sourcing SPI 0.7 Output Status 1.5 kVrms
Si83408AFA-KIT Sourcing Parallel and SPI 0.7 None 1.5 kVrms
Si83414AAA-KIT Sinking Parallel 0.7 Output Status and Low Voltage 1.5 kVrms
Si83418ADA-KIT Sinking SPI 0.7 Output Status 1.5 kVrms
Si83418AFA-KIT Sinking Parallel and SPI 0.7 None 1.5 kVrms
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