MCP4351-104E/ML

Digital Potentiometers Overview

The MCP4351-104E/ML is a quad digital potentiometer IC from Microchip Technology, featuring four independent 8-bit resistor networks with 257 taps. It utilizes volatile RAM for wiper settings and operates via a high-speed SPI serial interface supporting up to 10 MHz at VDD ≥ 2.7V. The device offers RAB resistance options including 100 kΩ (indicated by the -104 suffix) and supports both potentiometer and rheostat configurations. Key electrical characteristics include a typical wiper resistance of 75 Ω, a bandwidth of 2 MHz for the 5 kΩ variant, and an operating voltage range of 1.8V to 5.5V. It includes features such as terminal disconnect control, a reset input pin, and high-voltage tolerant digital inputs up to 12.5V.

Digital Potentiometers Feature Summary

• Quad 8-bit Digital Potentiometer with 257 taps and volatile memory
• SPI Serial Interface with 10 MHz clock speed (Modes 0,0 and 1,1)
• High-Voltage Tolerant Inputs: Up to 12.5V on CS, SCK, SDI, and RESET pins
• Terminal Disconnect Feature via TCON Register for flexible circuit configuration

Digital Potentiometers Applications

• Programmable gain amplifiers and variable attenuators in signal conditioning circuits
• Digital trimming of reference voltages and bias currents
• Audio volume control and tone adjustment systems
• Calibration of sensor signals and instrumentation front-ends

Digital Potentiometers Procurement Notes

Verify the specific resistance value corresponding to the ordering suffix '-104' (100 kΩ) against the manufacturer's datasheet DS22242A. Confirm that the volatile memory type meets system requirements, as wiper settings are lost upon power cycle. Ensure the PCB layout accommodates the QFN-20 package thermal pad for adequate heat dissipation within the specified temperature range.

Digital Potentiometers Selection Notes

Select this component when a quad channel digital potentiometer with high-voltage tolerant logic interfaces is required. The 8-bit resolution provides 256 steps, suitable for applications needing finer adjustment than 7-bit devices. Verify that the system can tolerate the loss of wiper position data during power interruptions due to the volatile RAM architecture. Compare against the MCP4361 if non-volatile memory retention is necessary for the application.

Digital Potentiometers Part Context

This part belongs to the MCP43X1 family of quad digital potentiometers. The '51' designation indicates an 8-bit resolution with volatile memory, distinguishing it from the 7-bit MCP4331 or the non-volatile EEPROM-based MCP4361. The '-104' suffix specifies the 100 kΩ nominal resistance between terminals A and B. The '/ML' suffix denotes the 4x4 mm QFN-20 package with an exposed thermal pad.

Digital Potentiometers Replacement Considerations

For direct functional replacement with non-volatile memory, consider the MCP4361-104E/ML. For lower resolution requirements, the MCP4331-104E/ML is available. Ensure any substitute maintains the same SPI interface compatibility and high-voltage input tolerance specifications.