MAX5491:Precision-Matched Resistor-Divider in SOT23

Ultra-Precision Voltage-Dividers in a SOT23 Keep Drift to 3ppm/°C

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.

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
MAX5491: Block Diagram
MAX5491: Block Diagram
Applications/Uses
  • Automated Test Equipment (ATE)
  • Industrial Process Controls
  • Instrumentation
  • Medical Equipment
  • Precision Gain Setting
  • Wireless Base Stations
DataSheet
titleDownload file
MAX5491 Data SheetMAX5491.pdf
Parametrics
Part NumberREND-TO-END
(kΩ)
Res. Tol.
(%)
Temp. Coeff.
(ppm/°C)
Package/PinsBudgetary
Price
typSee Notes
MAX5491300.02535SOT/3$1.50 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX5491LA01000+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491LA01000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491LA01000-TNo Longer AvailableMAX5491LA01000+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491LB01000+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491LB01000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491LB01000-TNo Longer AvailableMAX5491LB01000+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491LC01000+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491LC01000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491LC01000-TNo Longer AvailableMAX5491LC01000+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491MA01100+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX5491MA01100-TNo Longer AvailableMAX5491MA01100+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491MB01100+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491MB01100-TNo Longer AvailableMAX5491MB01100+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491MC01100+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491MC01100-TNo Longer AvailableMAX5491MC01100+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491NA01500+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491NA01500+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491NA01500-TNo Longer AvailableMAX5491NA01500+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491NB01500+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491NB01500+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX5491NB01500-TNo Longer AvailableMAX5491NB01500+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491NC01500+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491NC01500-TNo Longer AvailableMAX5491NC01500+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491PA02000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491PC02000+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491PC02000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491PC02000-TNo Longer AvailableMAX5491PC02000+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491RA02000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491RA02500+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491RA02500+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX5491RA02500-TNo Longer AvailableMAX5491RA02500+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491RB02000+TActiveSOT;3 pin-40°C to +85°CSee data sheet
MAX5491RB02000-TNo Longer AvailableMAX5491RB02000+TSOT;3 pin-40°C to +85°CSee data sheet
MAX5491RB02500+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491RB02500-TNo Longer AvailableMAX5491RB02500+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491RC02000+TActiveSOT;3 pin-40°C to +85°CSee data sheet
MAX5491RC02000-TNo Longer AvailableMAX5491RC02000+TSOT;3 pin-40°C to +85°CSee data sheet
MAX5491RC02500+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491RC02500+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491RC02500-TNo Longer AvailableMAX5491RC02500+TSOT,;3 pin;8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX5491SA03200+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491SA03200+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491SA03200-TNo Longer AvailableMAX5491SA03200+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491SB03200+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491SB03200-TNo Longer AvailableMAX5491SB03200+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491SC03200+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491SC03200+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491SC03200-TNo Longer AvailableMAX5491SC03200+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX5491TA05000+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX5491TA05000-TNo Longer AvailableMAX5491TA05000+TSOT;3 pin-40°C to +85°CSee data sheet
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