MCP4231-502E/SL

Digital Potentiometers Overview

The MCP4231-502E/SL is a dual-channel, 7-bit SPI digital potentiometer manufactured by Microchip Technology. It features two independent potentiometer networks with an end-to-end resistance (R_AB) of 5 kΩ and a tolerance of ±20%. The device provides 129 discrete wiper steps controlled via a standard SPI serial interface operating at frequencies up to 10 MHz. It utilizes volatile RAM memory for wiper settings, which reset to mid-scale upon power-up or brown-out events. The component supports a wide supply voltage range from 1.8V to 5.5V and operates within an extended temperature range of -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual Potentiometer Configuration: Contains two independent 7-bit resistor networks with 129 taps each.
• SPI Serial Interface: Supports high-speed read/write operations at clock frequencies up to 10 MHz in modes 0,0 and 1,1.
• High-Voltage Tolerant Inputs: Digital input pins (CS, SCK, SDI) tolerate voltages up to 12.5V, facilitating compatibility with higher voltage logic systems.
• Terminal Disconnect Feature: Allows resistor network disconnection via the SHDN pin or Terminal Control (TCON) register.

Digital Potentiometers Applications

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

Digital Potentiometers Procurement Notes

Verify that the specific ordering suffix '/SL' corresponds to the SOIC-14 surface-mount package as indicated in distributor catalogs. Confirm the '502' code denotes the 5 kΩ resistance value. Ensure the design accounts for volatile memory behavior, as wiper settings are lost during power cycles unless re-initialized by the host controller.

Digital Potentiometers Selection Notes

Select this model when a dual-channel configuration is required. The '502' suffix specifies a 5 kΩ nominal resistance; choose '103', '503', or '104' for 10 kΩ, 50 kΩ, or 100 kΩ respectively. The 'E' indicates RoHS compliance. Verify that the 7-bit resolution (129 steps) meets the application's precision requirements compared to 8-bit alternatives like the MCP4251.

Digital Potentiometers Part Context

This component belongs to the MCP423X family of single/dual SPI digital potentiometers with volatile memory. It shares architectural similarities with the MCP413X (single channel) and MCP425X (8-bit resolution) series. The primary distinction of the MCP4231 is its combination of dual channels, 7-bit resolution, and 5 kΩ resistance value in a compact SOIC package.

Digital Potentiometers Replacement Considerations

For direct functional replacement with identical specifications, consider the MCP4231-502E/P (PDIP-14 package) or MCP4231-502E/ST (TSSOP-14 package). For 8-bit resolution upgrades, the MCP4251-502E/SL offers 257 steps but requires verification of pinout compatibility and software register adjustments.