MCP4021-503E/MS

Overview

The MCP4021-503E/MS is a single-channel, nonvolatile digital potentiometer manufactured by Microchip Technology. It features a nominal resistance of 50 kΩ with 64 taps (6-bit resolution) and utilizes WiperLock™ technology to store settings in EEPROM without external write-protection pins. The device operates on a supply voltage range of 2.7V to 5.5V and supports an Up/Down serial interface. It includes high-voltage tolerant inputs up to 12.5V, low static current consumption, and linear taper characteristics.

Feature Summary

• Nonvolatile memory with WiperLock™ technology for secure wiper setting retention
• High-voltage tolerant digital inputs supporting up to 12.5V
• Simple Up/Down (U/D) serial control interface
• Extended temperature range operation from -40°C to +125°C

Applications

• Audio volume control circuits
• Sensor calibration systems
• Variable gain amplifier adjustment
• Power supply voltage reference trimming

Procurement Notes

Verify the package marking against the MSOP-8 specification. Confirm the 'E' suffix indicates extended temperature ratings (-40°C to +125°C). Ensure the '503' code corresponds to the 50kΩ resistance value. Check RoHS compliance documentation for environmental requirements.

Selection Notes

Select this component when nonvolatile resistance adjustment is required without additional microcontroller overhead. The U/D interface simplifies control logic compared to SPI or I2C alternatives. Verify that the 50kΩ resistance and 64-step resolution meet the circuit's precision requirements.

Part Context

This part belongs to the MCP4021/2/3/4 family of low-cost digital potentiometers. The MCP4021 variant specifically offers a potentiometer configuration in MSOP, SOIC, DFN, or SOT-23 packages. It shares core architecture with rheostat variants but is optimized for three-terminal applications.

Replacement Considerations

Direct replacements within the same family include MCP4021-502E/MS (5kΩ) or MCP4021-103E/MS (10kΩ) if resistance values differ. For higher resolution, consider the MCP41XXX series, though interface protocols may vary.