MCP4021T-503E/MCVAO

Overview

The MCP4021T-503E/MCVAO is a nonvolatile, 6-bit digital potentiometer with a nominal resistance of 50 kΩ. It features 64 taps and operates within a supply voltage range of 2.7V to 5.5V. The device utilizes a simple Up/Down serial interface for wiper control and incorporates WiperLock technology to store the setting in EEPROM. Key electrical parameters include a typical wiper resistance of 75 Ω, low temperature coefficient (10 ppm typ. ratiometric), and high-voltage tolerant inputs up to 12.5V. It supports extended temperature operation from –40°C to +125°C.

Feature Summary

• Nonvolatile memory with WiperLock technology retains wiper settings via EEPROM without external write-protect pins.
• High-voltage tolerant digital inputs allow direct interfacing with signals up to 12.5V while operating at lower VDD.
• Configurable as either a potentiometer or rheostat with 64 discrete resistance steps.
• Low power consumption with maximum static current of 1 µA when the serial interface is inactive.

Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifier biasing
• Voltage reference trimming
• Sensor calibration offset adjustment

Procurement Notes

Verify the suffix 'MCVAO' against Microchip's official documentation to confirm specific packaging, tape-and-reel specifications, or regional compliance markings. Ensure the ordering code matches the required package type and temperature grade before procurement.

Selection Notes

Select this component for applications requiring precise, nonvolatile resistance adjustment with minimal pin count. The 50 kΩ value suits moderate impedance circuits. Verify that the 1 MHz toggle frequency meets system timing requirements and that the 12.5V input tolerance aligns with the control logic levels.

Part Context

This part belongs to the MCP402x family of digital potentiometers. The '21' designation indicates a potentiometer configuration (vs. rheostat for '22'), '503' specifies the 50 kΩ resistance value, and 'E' denotes the extended temperature range. The 'T' indicates tape and reel packaging.

Replacement Considerations

Direct replacements within the same family include MCP4021T-503E/MFVAO or MCP4021T-503E/MSVAO depending on the required package (SOIC, MSOP, or DFN). Cross-family replacement requires verifying interface compatibility and resistance values.

FAQ

How does WiperLock technology function?

WiperLock automatically saves the current wiper position to the internal EEPROM whenever the CS pin goes high, securing the setting without requiring explicit write commands or additional hardware pins.

What is the maximum voltage allowed on the U/D and CS pins?

The CS and U/D inputs are high-voltage tolerant and can withstand up to 12.5V relative to VSS, regardless of the VDD supply voltage.

Can this device be used as a rheostat?

Yes, although the MCP4021 is primarily configured as a potentiometer, floating either terminal A or B allows it to operate in rheostat mode.