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.
Key Specifications:
• 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
