MCP4231T-104E/ST

Digital Potentiometers Overview

The MCP4231T-104E/ST is a dual-channel digital potentiometer IC featuring two independent 7-bit resistor networks. It provides 129 discrete resistance steps with a nominal total resistance (R_AB) of 100 kΩ and a typical wiper resistance of 75 Ω. The device operates on a single supply voltage ranging from 1.8 V to 5.5 V, with analog characteristics specified for the 2.7 V to 5.5 V range. It utilizes a standard SPI serial interface supporting modes 0,0 and 1,1 at frequencies up to 10 MHz. The unit employs volatile memory to store wiper settings and is housed in a 14-pin TSSOP package.

Digital Potentiometers Feature Summary

• Dual Potentiometer Configuration: Contains two independent 7-bit resistor networks offering 129 adjustable taps each.
• High-Voltage Digital Inputs: Digital control pins (CS, SCK, SDI, SHDN) tolerate voltages up to 12.5 V, enabling compatibility with higher logic levels.
• SPI Interface: Supports high-speed read/write operations via Serial Peripheral Interface at clock rates up to 10 MHz.
• Terminal Disconnect: Includes a Shutdown pin (SHDN) and Terminal Control (TCON) register to disconnect resistor network terminals.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifiers and variable biasing
• Voltage reference trimming and calibration
• Adaptive filter tuning

Digital Potentiometers Procurement Notes

Verify that the specific ordering suffix corresponds to the required tape and reel packaging configuration. Confirm that the component meets RoHS compliance standards for the intended manufacturing process. Ensure the design accounts for the volatile nature of the internal memory, which requires re-initialization upon power cycling.

Digital Potentiometers Selection Notes

Select this model when a dual-channel solution with 100 kΩ resistance is required. The 7-bit resolution provides 129 steps, suitable for applications not requiring fine 8-bit granularity. Verify that the system logic levels are compatible with the 12.5 V tolerant inputs or utilize level shifting if necessary. Consider the thermal resistance of the TSSOP package for heat dissipation requirements.

Digital Potentiometers Part Context

This component belongs to the MCP423X family of dual digital potentiometers manufactured by Microchip Technology. It shares the same core architecture and pinout as the non-tape-and-reel version (MCP4231-104E/ST), differing primarily in the shipping packaging format designated by the 'T' suffix.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same package include other variants from the MCP423X series, such as the MCP4231-104E/ST. Cross-family replacements like the MCP4631 series require interface adaptation due to I2C communication protocols instead of SPI.