MCP4331-502E/ST

Digital Potentiometers Overview

The MCP4331-502E/ST is a quad-channel digital potentiometer IC from Microchip Technology, featuring four independent resistor networks with 7-bit resolution (129 taps). It utilizes an SPI serial interface for high-speed read/write operations to wiper registers. The device operates within a supply voltage range of 1.8V to 5.5V and supports linear taper configurations. Key electrical characteristics include a typical wiper resistance of 75Ω, low temperature coefficients, and high-voltage tolerant digital inputs up to 12.5V. It employs volatile memory, resetting to mid-scale upon power-up or brown-out events.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent potentiometers with 7-bit resolution (129 taps) and linear taper.
• SPI Interface: Supports 10 MHz operation in Modes 0,0 and 1,1 with high-speed register access.
• High-Voltage Inputs: Digital input pins tolerate voltages up to 12.5V, supporting split-rail applications.
• Terminal Disconnect: Features TCON registers to disconnect resistor network terminals.

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference trimming
• Audio volume control

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E' indicates RoHS compliance and 'ST' denotes the TSSOP-14 package. Confirm that the '-502' code corresponds to the 5kΩ resistance value. Ensure the design accounts for volatile memory behavior, as wiper settings are lost upon power loss.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required in a single package. The 7-bit resolution provides 128 steps, suitable for applications not requiring fine adjustment. Verify that the system can tolerate volatile memory or implement external storage if data retention across power cycles is necessary.

Digital Potentiometers Part Context

This part belongs to the MCP433X/435X family of 7/8-bit Quad SPI Digital POTs with volatile memory. The MCP4331 specifically offers the 7-bit resolution variant with potentiometer configuration options. It shares the same pinout and interface logic with the 8-bit MCP4351 but differs in tap count and resolution.

Digital Potentiometers Replacement Considerations

The MCP4351-502E/ST serves as a direct functional replacement offering higher 8-bit resolution (257 taps) while maintaining the same package and interface. Other family members like MCP4341 offer non-volatile memory but require a minimum 2.7V supply voltage.