MCP4431-104E/ST

Digital Potentiometers Overview

The MCP4431-104E/ST is a quad digital potentiometer IC featuring four independent 7-bit resistor networks with 129 taps. It utilizes an I2C serial interface for high-speed read/write operations to wiper registers. The device supports potentiometer or rheostat configurations and offers RAB resistance options of 5kΩ, 10kΩ, 50kΩ, and 100kΩ. It operates on a wide supply voltage range from 1.8V to 5.5V, with full analog characteristics specified from 2.7V to 5.5V. The component includes high-voltage tolerant digital inputs up to 12.5V, a reset input pin, and brown-out reset protection.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent channels with 7-bit resolution (129 taps) and configurable potentiometer/rheostat modes.
• I2C Serial Interface: Supports standard (100 kHz), fast (400 kHz), and high-speed modes (up to 3.4 MHz) for rapid wiper updates.
• High-Voltage Tolerant Inputs: Digital inputs including HVC/A0 tolerate voltages up to 12.5V, enabling split-rail applications.
• Low Power Consumption: Typical inactive current of 2.5 µA and low wiper resistance of 75 Ω typical.

Digital Potentiometers Applications

• Audio volume control and tone adjustment in consumer electronics.
• Programmable gain amplifiers and variable biasing in instrumentation.
• Voltage reference trimming and calibration in industrial systems.
• Display backlight brightness control and contrast adjustment.

Digital Potentiometers Procurement Notes

Verify the package type matches the 'ST' suffix, which indicates a TSSOP-14 package. Confirm the resistance value corresponds to the '104' suffix (100 kΩ). Ensure the design accounts for the volatile memory nature of the MCP443X series, requiring wiper settings to be restored after power cycles. Check operating voltage requirements against the 1.8V to 5.5V range.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required with I2C connectivity. The 7-bit resolution provides 128 steps, suitable for applications not requiring fine 8-bit or 10-bit adjustments. Choose the 100 kΩ variant if higher impedance levels are needed for low-power signal paths. Consider the TSSOP-14 package constraints for PCB layout. Note that unlike the MCP4441, this device lacks non-volatile memory.

Digital Potentiometers Part Context

The MCP4431 belongs to the MCP443X/5X family of quad digital potentiometers manufactured by Microchip Technology. This family shares common features such as the I2C interface and high-voltage tolerant inputs but differs in resolution (7-bit vs 8-bit) and memory type (volatile RAM vs non-volatile EEPROM). The MCP4431 specifically uses volatile RAM, distinguishing it from the MCP4441 which retains settings via WiperLock technology.

Digital Potentiometers Replacement Considerations

The MCP4451-104E/ST is a direct replacement offering 8-bit resolution (257 taps) with the same I2C interface and package. For non-volatile storage requirements, the MCP4441-104E/ST serves as a functional equivalent with WiperLock technology. Single-channel alternatives include the MCP4131 or MCP4231 families, though these require multiple devices for quad functionality.