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ADR421:  Ultraprecision, Low Noise, 2.500 V XFET® Voltage References

Product Details

The ADR42x are a series of ultraprecision, second generation eXtra implanted junction FET (XFET) voltage references featuring low noise, high accuracy, and excellent long-term stability in SOIC and MSOP footprints.

Patented temperature drift curvature correction technique and XFET technology minimize nonlinearity of the voltage change with temperature. The XFET architecture offers superior accuracy and thermal hysteresis to the band gap references. It also operates at lower power and lower supply headroom than the buried Zener references.

The superb noise and the stable and accurate characteristics of the ADR42x make them ideal for precision conversion applications such as optical networks and medical equipment. The ADR42x trim terminal can also be used to adjust the out-put voltage over a ±0.5% range without compromising any other performance. The ADR42x series voltage references offer two electrical grades and are specified over the extended industrial temperature range of −40°C to +125°C. Devices have 8-lead SOIC or 30% smaller, 8-lead MSOP packages.


  • Precision data acquisition systems
  • High resolution converters
  • Battery-powered instrumentation
  • Portable medical instruments
  • Industrial process control systems
  • Precision instruments
  • Optical network control circuits


  • Chinese data sheet available
  • Low noise (0.1 Hz to 10 Hz)
    ADR420: 1.75 μV p-p
    ADR421: 1.75 μV p-p
    ADR423: 2.0 μV p-p
    ADR425: 3.4 μV p-p
  • Low temperature coefficient: 3 ppm/°C
  • Long-term stability: 50 ppm/1000 hours
  • Load regulation: 70 ppm/mA
  • Line regulation: 35 ppm/V
  • Low hysteresis: 40 ppm typical
  • Wide operating range
    ADR420: 4 V to 18 V
    ADR421: 4.5 V to 18 V
    ADR423: 5 V to 18 V
    ADR425: 7 V to 18 V
  • Quiescent current: 0.5 mA maximum
  • High output current: 10 mA
  • Wide temperature range: −40°C to +125°C

Pin Configuration for ADR421


Title Content Type File Type
ADR420/ADR421/ADR423/ADR425: Ultraprecision, Low Noise, 2.048 V/2.500 V/3.00 V/5.00 V XFET® Voltage References Data Sheet (Rev J, 12/2013) (pdf, 544 kB) Data Sheets PDF
AN-713: The Effect of Long-Term Drift on Voltage References  (pdf, 237 kB) Application Notes PDF
CN-0181: Precision, 16-Bit, Voltage Level Setting with Less than 5 mW Total Power Dissipation  (pdf, 175 kB) Circuit Note PDF
CN-0175: A Low Cost, 8-Channel, Simultaneously Sampled, Data Acquisition System with 84 dB SNR and Excellent Channel-to-Channel Matching  (pdf, 347 kB) Circuit Note PDF
CN-0150: Software Calibrated, 1 MHz to 8 GHz, 70 dB RF Power Measurement System Using the AD8318 Logarithmic Detector  (pdf, 250 kB) Circuit Note PDF
CN-0148: Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System (DAS) Based on the AD7606 16-Bit, 8-Channel DAS  (pdf, 502 kB) Circuit Note PDF
CN-0131: 16 Channels of Programmable Output Span Using the AD5360 16-Bit Voltage Output DAC  (pdf, 85 kB) Circuit Note PDF
CN-0079: High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/AD5541 Voltage Output DAC, ADR421 Reference, and AD8628 Auto-Zero Op Amp  (pdf) Circuit Note PDF
CN-0169: How to Achieve High Precision Voltage Level Setting Using the AD5542A/AD5541A 16-Bit Voltage Output DAC  (pdf, 457 kB) Circuit Note PDF
Designing DACs into Precision Industrial 10-V Applications
by Brendan Cronin, Analog Devices, Inc. (PlanetAnalog, 3/23/2006)
Technical Articles HTML
High-Performance Multichannel Power-Line Monitoring with Simultaneous-Sampling ADCs
By Colm Slattery, Analog Devices, Inc. (Analog Dialogue, Vol. 41, January 2007)
Analog Dialogue HTML
High Speed Op Amp Drives a 16-Bit, 1-MSPS Differential-Input A/D Converter
(Analog Dialogue, Vol. 36, No. 6, November/December 2002)
Analog Dialogue HTML
Low-Power Data Conversion Technology Enhances Portability
(Electropages, 10/5/2006)
Product Reviews HTML
ICs for Programmable Logic Control and Distributed Control Systems  (pdf, 976 kB)
Analog Devices leadership in industrial IC technology, with the development of the iCMOS™ and iPolar™ processes, has uniquely defined high voltage and low voltage integration to deliver smaller, higher performance, and more cost effective ICs for industrial systems.
Overview PDF
RAQs index Rarely Asked Questions HTML
What do I need to know about selecting and using Voltage References? FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Voltage Reference Selection & Evaluation Wizard Design Calculators 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.

Product Recommendations & Reference Designs

Engineered. Tested. Ready to Integrate.
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Price, packaging, availability

ADR421 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADR421ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $3.19 $2.88 Y  Material Info PCN Purchase
ADR421ARMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $2.88 Y  Material Info PCN Purchase
ADR421ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.19 $2.88 Y  Material Info PCN Purchase Sample
ADR421ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.88 Y  Material Info PCN Purchase
ADR421BR Status: Production 8 ld SOIC 8 Ind Tube, 98 $6.00 $5.04 N  Material Info PCN Purchase
ADR421BR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $5.04 N  Material Info PCN Purchase
ADR421BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.27 $4.43 Y  Material Info PCN Purchase
ADR421BRZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $4.43 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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