MCP4331T-103E/ST

Digital Potentiometers Overview

The MCP4331T-103E/ST is a quad digital potentiometer IC featuring four independent resistor networks with volatile memory. It offers 7-bit resolution (129 taps) and supports R_AB resistance options of 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ. The device operates on a supply voltage range of 1.8V to 5.5V for serial interface functionality and 2.7V to 5.5V for specified analog characteristics. It utilizes a high-speed SPI serial interface supporting up to 10 MHz and includes features such as terminal disconnect via the TCON register, a dedicated reset input pin, and brown-out reset protection.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent potentiometers or rheostats in a single package.
• High-Speed SPI Interface: Supports data rates up to 10 MHz with Modes 0,0 and 1,1.
• Extended Voltage Operation: Serial interface functional from 1.8V; full specifications at 2.7V to 5.5V.
• Terminal Disconnect Feature: Allows disconnection of resistor network terminals via the Terminal Control (TCON) Register.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits.
• Programmable gain amplifiers and variable attenuators.
• Voltage reference trimming and calibration systems.
• Industrial process control loop adjustments.

Digital Potentiometers Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging and 'ST' denotes the TSSOP package type. Confirm the '-103' code corresponds to the required 10 kΩ resistance value. Ensure the design accounts for volatile memory behavior upon power loss, as wiper settings are not retained without external non-volatile storage.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required in a compact form factor. Choose the MCP4331 over MCP4332 if potentiometer configuration (three-terminal operation) is preferred over rheostat configuration. Verify that the system's digital logic levels are compatible with the high-voltage tolerant inputs (up to 12.5V) if interfacing with higher voltage microcontrollers.

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 provides 7-bit resolution (129 taps), whereas the MCP4351 variant offers 8-bit resolution (257 taps). Both share similar electrical characteristics but differ in step count and address space.

Digital Potentiometers Replacement Considerations

MCP4332T-103E/ST (Rheostat configuration)

Digital Potentiometers FAQ

What is the default wiper setting after power-on?

Upon Power-On Reset (POR) or Brown-Out Reset (BOR), the wipers are set to mid-scale (080h hex for 8-bit devices, though this is a 7-bit device, it defaults to the center position relative to its range).

Can the digital inputs tolerate voltages higher than VDD?

Yes, the CS, SCK, SDI, and RESET pins are high-voltage tolerant up to 12.5V, allowing them to be driven by logic levels higher than the analog supply voltage VDD.

How does the device handle power loss regarding stored values?

The MCP4331 uses volatile RAM for wiper settings. All wiper positions and terminal control settings are lost when power is removed and revert to their POR/BOR defaults upon re-powering.