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Analog Devices REF191GSZ — Discrete Semiconductors
Analog Devices

REF191GSZ Voltage Reference, 2.048 V, ±0.5%, 8-SOIC

MPNREF191GSZ
End of Life

Analog Devices REF19 series, REF191GSZ, fixed 2.048 V series voltage reference, ±0.5% tolerance, 30 mA output, 45 µA supply, 25 ppm/°C drift, 8-SOIC package, -40°C to 85°C.

$5.06Ref. price · indicative, final on quote
REF191GSZ datasheet
Packaging8-SOIC (0.154", 3.90mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

REF191GSZ Technical Specifications
ParameterValue
SeriesREF19
Output typeFixed
Mounting typeSurface Mount
Reference typeSeries
Voltage - input3V ~ 15V
Voltage - output (Min (Fixed))2.048V
Current - output30 mA
Current - supply45µA
Operating temperature-40°C ~ 85°C (TA)
PackageTube
Tolerance±0.5%
Case8-SOIC (0.154\", 3.90mm Width)
Noise - 0.1Hz to 10Hz20µVp-p
Temperature coefficient25ppm/°C

Product details

2.048 V reference for precision analog chains

The REF191GSZ is a fixed 2.048 V series voltage reference in an 8-SOIC package. It regulates the output to within ±0.5% initial tolerance and can source up to 30 mA.

Active lifecycle — no LTB clock ticking

ADI lists the REF191GSZ as Active. There is no last-time-buy notice, no NRND flag, and no official successor code to track. For a BOM that needs a stable reference for the next several years, this part does not carry an obsolescence risk. The REF19 series has been a staple in ADI's catalogue for years — the risk profile is low, but as with any single-sourced IC, a second-source qualification (see the ADR291 peers) is worth the paperwork if the production volume justifies it.

Frequently asked questions

Is REF191GSZ obsolete?

No — the lifecycle status is Active. There is no discontinuation notice and no last-time-buy window. It is safe for new designs and ongoing production.

What is the tolerance of REF191GSZ?

Initial accuracy is ±0.5%. At 2.048 V that means the output can be anywhere from 2.037 V to 2.059 V before temperature drift is factored in.

What is the difference between REF191GSZ and REF192GSZ?

The REF192GSZ is the same REF19 series but with a 2.5 V output instead of 2.048 V. All other specs — package, tolerance, supply current, temperature coefficient — are identical. The choice is purely which reference voltage the ADC or DAC requires.

What is the closest functional second-source to REF191GSZ?

The ADR291FRZ (ADI XFET series) is a functional alternative: it outputs 2.5 V (not 2.048 V) with tighter tolerance (±0.12%) and lower drift (15 ppm/°C), but its maximum output current is only 5 mA versus the REF191GSZ's 30 mA. If the load current is under 5 mA and the system can accept 2.5 V, the ADR291FRZ is a drop-in 8-SOIC replacement with better accuracy. For a 2.048 V requirement, no exact pin-compatible second source is listed in the REF19 series.