MCP4021T-502E/MC

Overview

The MCP4021T-502E/MC is a nonvolatile, 6-bit digital potentiometer manufactured by Microchip Technology in an 8-DFN (2x3) surface-mount package. It features a nominal resistance of 5 kΩ with ±20% tolerance and 64 taps. The device utilizes a simple Up/Down (U/D) serial interface for wiper control and incorporates WiperLock™ technology to store settings in EEPROM. Operating voltage ranges from 2.7V to 5.5V, with an extended temperature range of –40°C to +125°C.

Feature Summary

• WiperLock™ Nonvolatile Memory: Stores wiper position in EEPROM for power-on recall without external write-protect pins.
• High-Voltage Tolerant Inputs: CS and U/D pins tolerate up to 12.5V, allowing direct interfacing with higher voltage logic.
• Simple Serial Interface: Controlled via a 2-wire Up/Down protocol with a toggle frequency up to 1 MHz.
• Low Power Consumption: Maximum static current of 1 µA when the serial interface is inactive.

Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifiers and variable attenuators
• Voltage reference trimming and calibration
• LCD bias voltage adjustment

Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging and the 'MC' suffix specifies the 8-DFN package. Confirm the 'E' suffix denotes the extended industrial temperature range (-40°C to +125°C). Ensure the '502' code corresponds to the 5 kΩ resistance value required for the design.

Selection Notes

Select this component for applications requiring persistent resistance settings after power loss. The 5 kΩ value suits moderate impedance circuits. For rheostat configurations, ensure terminal A or B is left floating. Verify that the 12.5V input tolerance meets the system's control line voltage levels.

Part Context

This part belongs to the MCP4021/2/3/4 family of low-cost nonvolatile digital potentiometers. The MCP4021 variant specifically supports potentiometer configuration, while the MCP4022 and MCP4024 support rheostat modes. All share the same core architecture and WiperLock™ technology.

Replacement Considerations

Direct pin-compatible replacements within the same package include other MCP4021 variants with different resistance values (e.g., MCP4021T-103E/MC for 10 kΩ or MCP4021T-202E/MC for 2.1 kΩ). Cross-family replacements require verification of interface compatibility and package dimensions.