Diodes Incorporated

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Extremely low knee current 3.3V shunt reference

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The ZXRE330 is a low knee current 3.3V voltage reference. Offering tight tolerances and sharp knee characteristics, it consumes only 1µA when the 3.3V reference voltage can no longer be maintained.

Excellent performance is maintained over the 1µA to 5mA operating current range. The device has been designed to be highly tolerant of capacitive loads, so maintaining excellent stability.

It is available in small-outline SOT23 and TO92 packages. This device offers a pin for pin compatible alternative to industry standard shunt voltage reference.


  • Small Packages: SOT23 & TO92
  • No Output Capacitor Required
  • Output Voltage Tolerance
    • ZXRE330E: ±2% at +25°C
    • ZXRE330A: ±0.5% at +25°C
  • Low Output Noise
    • 55µVRMS (10Hz to 10kHz)
  • Wide Operating Current Range 1µA to 5mA
  • Extended Temperature Range -40°C to +85°C
  • Low Temperature Coefficient 20ppm/°C (typ)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Battery-powered equipment
  • Precision power supplies
  • Portable instrumentation
  • Portable communications devices
  • Notebooks and palmtop computers
  • Data acquisition systems
  • Low current voltage clamps

Product Specifications

Product Parameters

Type Shunt reference
Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
ReferenceVoltage (V) 3.3 V
Tolerance (%) 0.5 %
Sink Current (mA) 5 mA
Minimum Cathode Current for Regulation Typ (µA) 1 µA
Typical Temperature Coefficient (ppm/°C) 15 ppm/°C
Maximum Slope Resistance (Ω) 2 Ω
Noise Voltage (µV/Hz) 55 µV/Hz
Operating Ambient Temperature Range (°C) -40 to 85 °C

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Technical Documents

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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)
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site
PCN-2304 2018-01-05 2018-04-05 Additional Qualified Fab Source for MOSFET Devices and BOM (Bill of Materials) on Selected Devices