Precision-Matched Resistor-Divider in SOT23

Ultra-Precision Voltage-Dividers in a SOT23 Keep Drift to 3ppm/°C
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Active: In Production.


The MAX5491 precision resistor-divider consists of two accurately matched resistors with access to the ends and center of the divider. This device offers excellent resistance matching of 0.035% (A grade), 0.05% (B grade), and 0.1% (C grade). The MAX5491 includes an extremely low resistance-ratio temperature drift of 2ppm/°C over -40°C to +85°C, and has an end-to-end resistance of 30kΩ. Resistance ratios from 1:1 to 30:1 are available. Ten standard ratios are available (see Table 1), and custom ratios are also available upon request. To enhance device and system robustness, the MAX5491 also features ±2kV Human Body Model electrostatic discharge (ESD) protection to ensure against real-world ESD events. The MAX5491 is ideal for precision gain-setting applications where tight resistance matching and low temperature drift are necessary.

The MAX5491 is available in a space-saving 3-pin SOT23 package, and is guaranteed over the extended -40°C to +85°C temperature range.

Data Sheet

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Key Features

  • Resistance Ratios from 1:1 to 30:1
  • Custom Ratios Available Upon Request
  • ±2kV Human Body Model ESD Protection
  • Tight Initial Ratio Accuracy
    • 0.035% (MAX5491A)
    • 0.05% (MAX5491B)
    • 0.1% (MAX5491C)
  • Low 2ppm/°C Resistor-Ratio-Drift
  • Up to 50V Operating Voltage Across Sum of R1 and R2
  • Tiny 3-Pin SOT23 Package


  • Automated Test Equipment (ATE)
  • Industrial Process Controls
  • Instrumentation
  • Medical Equipment
  • Precision Gain Setting
  • Wireless Base Stations

Key Specifications:

Digital Potentiometers
Part Number REND-TO-END
Res. Tol.
Temp. Coeff.
typ See Notes
MAX5491  30 0.025 35 $0.67 @1k
See All Digital Potentiometers (128)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX5491: Block Diagram
Block Diagram

More Information

Topmark Coding MAX5491
New Product Press Release   2003-11-25 ]

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Information Index

Document Ref.: 19-3009 Rev 3; 2004-12-17
This page last modified: 2009-10-08