MCP4431T-103E/ST

Digital Potentiometers Overview

The MCP4431T-103E/ST is a quad digital potentiometer IC featuring four independent resistor networks with I2C serial interface control. It provides 7-bit resolution, offering 128 resistors and 129 taps per channel. The device supports RAB resistance options of 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ, with the -103 suffix indicating a nominal 10 kΩ value. It operates on a supply voltage range of 1.8V to 5.5V for general operation, with full specifications guaranteed from 2.7V to 5.5V. The unit utilizes volatile RAM memory for wiper settings and includes high-voltage tolerant digital inputs up to 12.5V.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent potentiometers or rheostats in a single package.
• I2C Interface: Supports Standard (100 kHz), Fast (400 kHz), and High-Speed modes up to 3.4 MHz.
• High-Voltage Tolerance: Digital inputs (HVC/A0, SCL, SDA) tolerate voltages up to 12.5V.
• Terminal Control: Includes a Terminal Control (TCON) register for disconnecting resistor network terminals.

Digital Potentiometers Applications

• Split rail applications requiring high-voltage tolerant digital control.
• Audio volume control and tone adjustment circuits.
• Programmable gain amplifiers and variable biasing networks.
• System calibration and trimming in industrial instrumentation.

Digital Potentiometers Procurement Notes

Verify the specific package type against the ordering suffix. The 'ST' suffix denotes the TSSOP-14 package. Confirm that the application design accommodates the volatile nature of the internal RAM, as wiper positions are lost upon power cycle unless re-initialized by the host controller.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required with I2C connectivity. Ensure the system voltage meets the 2.7V minimum for specified analog characteristics if operating outside the extended 1.8V functional range. Verify that the 10 kΩ resistance value aligns with the target circuit impedance requirements.

Digital Potentiometers Part Context

This part belongs to the MCP443X/5X family of 7/8-bit volatile quad digital potentiometers. The MCP4431 specifically denotes the 7-bit resolution variant with potentiometer configuration. It shares the same pinout and core architecture with the MCP4432 (rheostat), MCP4451 (8-bit), and non-volatile variants like the MCP4441.

Digital Potentiometers Replacement Considerations

Direct pin-compatible replacements within the same family include the MCP4432 (Rheostat config) and MCP4451 (8-bit resolution). Non-volatile equivalents such as the MCP4441 offer similar functionality but require a higher minimum operating voltage of 2.7V.