Diodes Incorporated

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ZR4040-5 (Not Recommended for new design)

NRND = Not Recommended for New Design

3.3V Low Knee Current voltage reference

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The ZR4040-5.0 uses a bandgap circuit design to achieve a precision micropower voltage reference of 5.0 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important, as well as packages for through hole requirements. The ZR4040-5.0 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZR4040-5.0 is recommended for operation between 60µA and 15mA 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 package
  • No stabilising capacitor required
  • Typical TC 20ppm/°C
  • Typical slope resistance 0.33Ω
  • 2% and 1% tolerance
  • Automotive temperature range
  • Operating current 60μA to 15mA
  • Transient response,stable in less than 10μs
  • Application(s)

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

    Product Parameters

    Accuracy (%) 1
    Compliance (Only Automotive supports PPAP) No
    Compliance (Only Automotive supports PPAP) Standard
    MaximumInput Voltage (V) -
    Maximum Slope Resistance (Ω) 1.5
    Minimum Cathode Current for Regulation Typ (µA) 30
    Noise Voltage (µV/Hz) 105
    Operating Ambient Temperature Range (°C) -40 to 85
    Operating Ambient Temperature Range (°C) -40 to 85
    AEC Qualified No
    ReferenceVoltage (V) 5
    Sink Current (mA) 20
    Tolerance (%) 1
    Type Shunt reference
    Typical Temperature Coefficient (ppm/°C) 20

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    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2642 2023-09-05 2024-03-05 Device End of Life (EOL)