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ON Semiconductor NCID9211 Ceramic Digital Isolator

The ON Semiconductor NCID9211 is a galvanically isolated full duplex, bi-directional, high-speed dual-channel ceramic digital isolator with output enable. The digital isolator supports isolated communications thereby allowing digital signals to communicate between systems without conducting ground loops or hazardous voltages.

The NCID9211 utilizes ON Semiconductor patented galvanic off-chip capacitor isolation technology and optimized IC design to achieve high insulation and high noise immunity, characterized by high common mode rejection and power supply rejection specifications. The two-channel digital isolator’s thick ceramic substrate yields capacitors with ~25 times the thickness of thin film on-chip capacitors and coreless transformers. The result is a combination of the electrical performance benefits that digital isolators offer with the safety reliability of a >0.5 mm insulator barrier. This is similar to what has historically been offered by optocouplers.

NCID9211 Features

  • The only Digital Isolator available that includes insulation reliability that matches optocouplers
  • DTI (Distance Through Insulation): ≥ 0.5 mm
  • Maximum Working Insulation Voltage: 2000 Vpeak
  • Specifications Guaranteed Over 2.5 V to 5.5 V Supply Voltage and −40°C to 125°C Extended Temperature Range
  • High Speed:
    • 50 Mbit/s Data Rate (NRZ)
    • 25 ns Maximum Propagation Delay
    • 10 ns Maximum Pulse Width Distortion
  • No insulation material wear out over time up to 1500V, no LED degradation, consistent performance from device-to-device
  • 100 KV/µs Minimum Common Mode Rejection
  • Full Duplex, Bi−directional Communication
  • 8 mm Creepage and Clearance Distance to Achieve Reliable High Voltage Insulation.
  • Over Temperature Detection
  • AEC−Q100 qualified: NCIV9211 (Pending)
  • Output Enable Function (Primary and Secondary Side)
  • Safety and Regulatory Approvals (Pending)
    • UL1577, 5000 VRMS for 1 Minute
    • DIN VDE V 0884−11

NCID9211 Benefits

  • Performance of a Digital Isolator with safety of an optocoupler
  • Off−Chip Capacitive Isolation to Achieve Reliable High Voltage Insulation
  • Better safety and long term reliability vs.other Digital Isolation methodologies.
  • Device performance across voltage and temperature is predictable and doesn't require overdesign
  • Better performance than optocoupler solutions
  • Longer life time expectancy than optocouplers and other Digital Isolators in the market.
  • Improves noise immunity while meeting stringent EMC/EMI performance requirements

NCID9211 Application

  • Isolated PWM Control
  • Industrial Fieldbus Communications
  • Microprocessor System Interface (SPI, I2C, etc.)
  • Programmable Logic Control
  • Isolated Data Acquisition System
  • Voltage Level Translator
  • Power Supply end products


NCID9211 Block Diagram

ON-Semiconductor NCID9211 Block Diagram


NCID9211 Pin Configuration

ON-Semiconductor NCID9211 Pin Configuration
ON-Semiconductor NCID9211 Package


The NCID9211 is housed in a 16−pin wide body small outline package.