MCP4231-503E/ML

Digital Potentiometers Overview

The MCP4231-503E/ML is a dual-channel, 7-bit digital potentiometer manufactured by Microchip Technology. It features two independent resistor networks with a nominal resistance of 50 kΩ and 129 tap positions. The device operates on an SPI serial interface supporting up to 10 MHz at VDD ≥ 2.7V or 1 MHz at VDD = 1.8V to 2.7V. It utilizes volatile memory for wiper settings and includes high-voltage tolerant digital inputs rated up to 12.5V. The component supports both potentiometer and rheostat configurations within an extended temperature range of -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual Resistor Network: Two independent 7-bit (129 steps) channels with 50 kΩ nominal resistance.
• SPI Interface: Supports standard modes 0,0 and 1,1 with SCK frequencies up to 10 MHz.
• High-Voltage Inputs: Digital control pins tolerate voltages up to 12.5V regardless of VDD level.
• Low Power Consumption: Typical standby current of 2.5 µA when the serial interface is inactive.

Digital Potentiometers Applications

• Programmable gain amplifiers in instrumentation systems
• Digital volume control in audio equipment
• Voltage reference adjustment in power supplies
• Sensor bias calibration in industrial controllers

Digital Potentiometers Procurement Notes

Verify the 'ML' package suffix against official Microchip documentation to confirm the specific plastic leaded chip carrier variant. Ensure the order code matches the required 7-bit resolution and 50 kΩ resistance value. Confirm that the application design accounts for the volatile nature of the wiper memory, as settings are lost upon power removal.

Digital Potentiometers Selection Notes

Select this model over the MCP4232 if a potentiometer configuration (three-terminal operation) is required rather than a rheostat. Choose the 7-bit version (MCP4231) over the 8-bit MCP4235 if lower step resolution is acceptable for cost or speed optimization. Verify that the system voltage remains within the 1.8V to 5.5V operating range to ensure proper functionality of the internal weak pull-ups and Schmitt triggers.

Digital Potentiometers Part Context

This component belongs to the MCP413X/415X/423X/425X family of single and dual SPI digital potentiometers. It shares core architectural features with the MCP4235 (8-bit) and MCP4131 (single channel), differing primarily in the number of channels and bit resolution. The family is characterized by its compatibility with standard SPI protocols and high-voltage tolerant I/Os.

Digital Potentiometers Replacement Considerations

Direct functional replacements include the MCP4235-503E/ML for higher 8-bit resolution or the MCP4131-503E/ML for single-channel applications. Cross-family non-volatile alternatives like the MCP4261 offer similar electrical characteristics but require verification of pinout compatibility and memory retention requirements.