MCP4351-103E/ST

Digital Potentiometers Overview

The MCP4351-103E/ST is a quad-channel digital potentiometer IC featuring an SPI serial interface and volatile memory. It provides four independent resistor networks with 8-bit resolution, offering 256 steps (257 taps). The nominal resistance is 10 kΩ with a ±20% tolerance. Operating voltage ranges from 1.8V to 5.5V for device operation, with full electrical specifications guaranteed from 2.7V to 5.5V. The device supports high-voltage tolerant digital inputs up to 12.5V and operates within an extended temperature range of -40°C to +125°C.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent potentiometers or rheostats in a single package.
• SPI Interface: Supports 10 MHz clock speeds in Modes 0,0 and 1,1 with high-speed read/write capabilities.
• High-Voltage Tolerant Inputs: Digital control pins tolerate voltages up to 12.5V.
• Terminal Disconnect: Features a Terminal Control (TCON) register to disconnect resistor network terminals.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits.
• Programmable gain amplifiers and variable impedance matching.
• Sensor biasing and reference voltage trimming.
• Industrial process control loop tuning.

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'ST' corresponds to the TSSOP-20 package when sourcing. Confirm that the application design accounts for volatile memory behavior, as wiper settings are lost upon power loss. Ensure the system logic supports the required SPI modes and voltage levels for reliable communication.

Digital Potentiometers Selection Notes

Select this component for designs requiring four digitally controlled resistors with fast SPI updates. The 10kΩ value suits moderate current applications. Note that the 1.8V minimum operating voltage allows low-power systems, but AC/DC characteristics are specified from 2.7V. Consider the MCP4341 if non-volatile memory retention is required instead of volatile RAM.

Digital Potentiometers Part Context

This part belongs to the MCP433X/435X family of quad SPI digital potentiometers. The '51' designation indicates 8-bit resolution (257 taps), distinguishing it from the 7-bit MCP4331 (129 taps). The '1' suffix denotes a potentiometer configuration, whereas '2' would indicate a rheostat. It shares the same pinout and interface as other members of the series.

Digital Potentiometers Replacement Considerations

The MCP4341-103E/ST offers identical pinout and functionality but includes non-volatile EEPROM memory. The MCP4331-103E/ST provides the same interface but with lower 7-bit resolution. Verify that any substitute maintains the required 10kΩ resistance and TSSOP-20 packaging.