Diodes Incorporated

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3.3V Low Knee Current voltage reference

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The ZRC330 uses a bandgap circuit design to achieve a precision micropower voltage reference of 3.3 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important. The ZRC330 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRC330 is recommended for operation between 20µA and 5mA and so is ideally suited to low power and battery powered applications. Excellent performance is maintained to an absolute maximum of 25mA, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds.


  • Small outline SOT23 style package
  • No stabilising capacitor required
  • Low knee current, 15μA typical
  • Typical slope resistance 0.6Ω
  • ± 3%, 2% and 1% tolerance
  • Industrial temperature range
  • Operating current 20μA to 5mA
  • Application(s)

  • Battery powered and portable equipment.
  • Metering and measurement systems.
  • Instrumentation.
  • Test equipment.
  • Data acquisition systems.
  • Precision power supplies.
  • Crystal oscillators
  • Product Specifications

    Product Parameters

    Type Shunt reference
    Compliance (Only Automotive supports PPAP) Standard
    AEC Qualified No
    ReferenceVoltage (V) 3.3 V
    Tolerance (%) 2, 1 %
    Sink Current (mA) 5 mA
    Minimum Cathode Current for Regulation Typ (µA) 15 µA
    Typical Temperature Coefficient (ppm/°C) 15 ppm/°C
    Maximum Slope Resistance (Ω) 2 Ω
    Noise Voltage (µV/Hz) 75 µV/Hz
    Operating Ambient Temperature Range (°C) -40 to 85 °C

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