Diodes Incorporated

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The LM4040Q is a family of bandgap circuits designed to achieve precision micro-power voltage references of 2.5V, 3.0V and 5.0V. The devices are available in 0.2% B-grade, 0.5% C-grade and 1% D-grade initial tolerances.

They are available in small outline SOT23 surface mount package which is ideal for applications where space is at a premium. Excellent performance is maintained over the 60μA to 15mA operating current range with a typical temperature coefficient of only 20ppm/°C. The device has been designed to be highly tolerant of capacitive loads therefore maintaining excellent stability.

This device offers a pin for pin compatible alternative to the industry standard LM4040 voltage reference for automotive applications.

The LM4040Q has been qualified to AEC-Q100 Grade 1 and is Automotive Grade supporting PPAPs.


  • Small packages: SOT23
  • No output capacitor required
  • Output voltage tolerance
    • LM4040BQ ±0.2% at +25°C
    • LM4040CQ ±0.5% at +25°C
    • LM4040DQ ±1% at +25°C
  • Low output noise
  • 10Hz to 10kHz... 45μVRMS
  • Wide operating current range 60μA to 15mA
  • Extended temperature range -40°C to +125°C
  • Low temperature coefficient 100 ppm/°C (max)
  • Green Molding in SOT23
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device
  • Automotive Grade
  • Qualified to AEC-Q100 Standards for High Reliability
  • PPAP Capable


  • Automotive Reference Voltage
  • Data Acquisition Systems

Product Specifications

Product Parameters

Type Shunt reference
Compliance (Only Automotive supports PPAP) Automotive
AEC Qualified Yes
ReferenceVoltage (V) 2.5, 3.0, 3,3, 4.096, 5.0 V
Tolerance (%) 1, 0.5, 0.2 %
Sink Current (mA) 15 mA
Minimum Cathode Current for Regulation Typ (µA) 45, 47, 50, 54 µA
Typical Temperature Coefficient (ppm/°C) 15, 20 ppm/°C
Maximum Slope Resistance (Ω) 0.9, 1.0, 1.1 Ω
Noise Voltage (µV/Hz) 35, 64, 80 µV/Hz
Operating Ambient Temperature Range (°C) -40 to 125 °C

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