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REF191:  2.048V, Precision Micropower, Low Dropout, Low Voltage Reference

Product Details

The REF19x series precision band gap voltage references use a patented temperature drift curvature correction circuit and laser trimming of highly stable, thin-film resistors to achieve a very low temperature coefficient and high initial accuracy.

The REF19x series is made up of micropower, low dropout voltage (LDV) devices, providing stable output voltage from supplies as low as 100 mV above the output voltage and consuming less than 45 μA of supply current. In sleep mode, which is enabled by applying a low TTL or CMOS level to the SLEEP pin, the output is turned off and supply current is further reduced to less than 15 μA.

The REF19x series references are specified over the extended industrial temperature range (−40°C to +85°C) with typical performance specifications over −40°C to +125°C for applications, such as automotive.

All electrical grades are available in an 8-lead SOIC package; the PDIP and TSSOP packages are available only in the lowest electrical grade.


  • Portable instruments
  • ADCs and DACs
  • Smart sensors
  • Solar powered applications
  • Loop-current-powered instruments
  • Data Sheet, Rev. J, 3/08


    • Initial Accuracy: ±2 mV Max
    • Temperature Coefficient: 5 ppm/°C Max
    • Low Supply Current: 45 µA Max
    • Sleep Mode: 15 µA Max
    • Low Dropout Voltage
    • Load Regulation: 4 ppm/mA
    • Line Regulation: 4 ppm/V
    • High Output Current: 30 mA
    • Short-Circuit Protection

    SOIC/TSSOP Pin Configuration for REF191

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    Voltage Reference Selection & Evaluation Wizard Design Calculators HTML
    REF191 SPICE Macro Model SPICE Models HTML

    Evaluation Kits & Symbols & Footprints

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    SampleSample & Buy

    Price, packaging, availability

    REF191 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    REF191ESZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.61 $2.59 Y  Material Info PCN Purchase
    REF191ESZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.61 Y  Material Info PCN Purchase
    REF191GSZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $1.46 $1.44 Y  Material Info PCN Purchase
    REF191GSZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $1.46 Y  Material Info PCN Purchase
    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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