MCP4431T-104E/ST

Digital Potentiometers Overview

The MCP4431T-104E/ST is a quad digital potentiometer IC featuring four independent resistor networks with an I2C serial interface. It provides 7-bit resolution, offering 128 taps per channel, and supports RAB resistance options of 5kΩ, 10kΩ, 50kΩ, and 100kΩ. The device operates on a supply voltage range of 1.8V to 5.5V and utilizes volatile RAM for wiper settings. Key electrical characteristics include a typical wiper resistance of 75Ω, a bandwidth of up to 2MHz for the 5kΩ variant, and high-voltage tolerant digital inputs capable of withstanding up to 12.5V.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent channels configurable as potentiometers or rheostats.
• I2C Serial Interface: Supports Standard (100 kHz), Fast (400 kHz), and High-Speed modes up to 3.4 MHz.
• High-Voltage Tolerant Inputs: Digital inputs including HVC/A0 tolerate voltages up to 12.5V.
• Terminal Disconnect Feature: Allows disconnection of resistor network terminals via the TCON register.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits.
• Programmable gain amplifiers and variable biasing networks.
• Sensor calibration and offset trimming in instrumentation.
• Split rail applications requiring isolated analog and digital domains.

Digital Potentiometers Procurement Notes

Verify the 'T' suffix indicates tape and reel packaging when ordering. Confirm the '104' code corresponds to the specific 100kΩ resistance value required for the design. Ensure the ST package type (TSSOP-14) matches the PCB footprint constraints. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Digital Potentiometers Selection Notes

Select this component for designs requiring four digitally controlled resistors with I2C connectivity. The 7-bit resolution provides 128 steps, suitable for moderate precision applications. Consider the 1.8V minimum operating voltage for low-power systems. Note that memory is volatile; wiper positions reset upon power loss unless managed by external logic.

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 features with the MCP4451 but differs in tap count (129 vs 257). The family supports both potentiometer and rheostat configurations through terminal management.

Digital Potentiometers Replacement Considerations

The MCP4451T-104E/ST offers similar functionality but with 8-bit resolution (257 taps). The MCP4461 series provides non-volatile memory instead of volatile RAM. Verify pin compatibility and software register mapping before substituting with other members of the MCP44XX family.