Features and Benefits

  • Ultralow Supply Current: 850nA
  • Low Drift
    • A Grade: 10 ppm/°C Max
    • B Grade: 20 ppm/°C Max
  • High Accuracy
    • A Grade: 0.05% Max
    • B Grade: 0.1% Max
  • Long-Term Drift: 15ppm/√kHr (LS8 Package)
  • No Humidity Sensitivity (LS8 Package)
  • High Output Drive Current: 5mA Min
  • Low Dropout Voltage: 10mV Max
  • Fully Specified from –40°C to 85°C
  • Operational from –55°C to 125°C
  • Wide Supply Range to 18V
  • Reverse Input/Output Protection
  • Available Output Voltage Options: 1.25V, 2.048V, 2.5V, 2.8V, 3V, 3.3V, 4.096V and 5V
  • Available in Low Profile (1mm) ThinSOT, (2mm × 2mm) DFN and High Stability Hermetic (5mm × 5mm) LS8 Packages

Product Details

The LT6656 is a tiny precision voltage reference that draws less than 1μA of supply current and can operate with a supply voltage within 10mV of the output voltage. The LT6656 offers an initial accuracy of 0.05% and temperature drift of 10ppm/°C. The combined low power and precision characteristics are ideal for portable and battery powered instrumentation.

The LT6656 can supply up to 5mA of output drive with 65ppm/mA of load regulation, allowing it to be used as the supply voltage and the reference input to a low power ADC. The LT6656 can accept a supply voltage up to 18V and withstand the reversal of the input connections.

The LT6656 output is stable with 1μF or larger output capacitance and operates with a wide range of output capacitor ESR.

This reference is fully specified for operation from –40°C to 85°C, and is functional over the extreme temperature range of –55°C to 125°C. Low hysteresis and a consistent temperature drift are obtained through advanced design, processing and packaging techniques.

The LT6656 is offered in the 6-lead SOT-23, (2mm × 2mm) DFN, and 8-lead LS8 Packages. The LS8 is a 5mm × 5mm surface mount hermetic package that provides outstanding stability.


  • Precision A/D and D/A Converters
  • Portable Gas Monitors
  • Battery- or Solar-Powered Systems
  • Precision Regulators
  • Low Voltage Signal Processing
  • Micropower Remote Sensing

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.


Models for the following parts are available in LTspice:


Reference Designs (1)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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