Diodes Incorporated

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2.5V Low Knee Current voltage reference

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The ZR285 uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important. The ZR285 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZR285 is recommended for operation between 20µA and 20mA and so is ideally suited to low power and battery powered applications. Excellent performance is maintained to an absolute maximum of 30mA, 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
  • Low knee current, 15μA typical
  • Typical TC 30ppm/°C
  • Typical slope resistance 0.4Ω
  • ± 3%, 2% and 1% tolerance
  • Industrial temperature range
  • Operating current 20μA to 20mA


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

Product Specifications

Product Parameters

Type Shunt reference
Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
ReferenceVoltage (V) 2.5 V
Tolerance (%) 2 %
Sink Current (mA) 20 mA
Minimum Cathode Current for Regulation Typ (µA) 13 µA
Typical Temperature Coefficient (ppm/°C) 30 ppm/°C
Maximum Slope Resistance (Ω) 1 Ω
Noise Voltage (µV/Hz) 50 µV/Hz
Operating Ambient Temperature Range (°C) -40 to 85 °C

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