Si838x Isolated Multi-Channel Input Devices for PLC Applications

Our Si838x isolators offer longer service life and dramatically higher reliability compared to competing opto-coupled input solutions. The device provides eight channels of 24 V digital field interface in a single compact QSOP package with integrated safety rated isolation. With a few external components, this structure provides compliance to IEC 61131-2 switch types 1, 2, or 3. The input interface is built on our ground-breaking CMOS-based LED emulator technology, which enables the bipolar capability (sinking or sourcing inputs) to operate without a power supply required on the field side. The output interface to the controller allows for low power operation with 2.5 V operation capability. These devices utilize our proprietary silicon isolation technology and support up to 2.5 kVrms withstand voltage, enabling high speed capability of 1 MHz (2 Mbps) for servo motor control, a high noise immunity of 25 kV/µs, lower prop delays and skew, reduced variation with temperature and age and tighter part-to-part matching. Product options include parallel or serialized outputs, a de-bounce filter, either pre-programmed (in the parallel configuration) or programmable (on the serial out configuration).

High channel density
8 channels in QSOP-20 package
Bi-polar inputs
IEC type1/2/3 sinking or sourcing input switches

Common Specs

  • 8x bipolar inputs, interface to 24 V digital field inputs
  • High speed channels of 2 Mbps for servo motor control
  • Integrated 2.5 kVrms safety rated isolation
  • 2.5 - 5.5 V VDD capability for low power controller interface
  • Serial (SPI) interface with controller
  • Capable of 16x Si838x daisy chain for 128 channels
  • IEC 61131-2 compliant, Type 1, 2, 3
  • De-bounce filter options
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Part Number Max Propagation Delay Isolation Rating (kVrms) Package Type Max Data Rate (Mbps) AEC-Q100 Input Type

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