MCP4551T-502E/MF

Digital Potentiometers Overview

The MCP4551T-502E/MF is a single-channel digital potentiometer IC from Microchip Technology, featuring an I²C serial interface and volatile memory. It provides 8-bit resolution with 256 taps and a nominal resistance (R_AB) of 5 kΩ. The device operates within a supply voltage range of 2.7V to 5.5V for full specifications, or 1.8V to 5.5V for serial interface operation only. Key electrical parameters include a typical wiper resistance of 75 Ω, a bandwidth of 2 MHz at 5 kΩ, and a temperature coefficient of 150 ppm/°C over the extended range (-40°C to +125°C). It is housed in an 8-pin DFN 3x3 package.

Digital Potentiometers Feature Summary

• I²C Serial Interface supporting 100 kHz, 400 kHz, and up to 3.4 MHz High-Speed modes
• 8-bit Resolution providing 256 discrete tap positions with linear taper
• High-Voltage Tolerant Digital Inputs allowing HVC/A0 pin tolerance up to 12.5V
• Volatile Memory configuration with Power-On Reset (POR) setting at Mid-Scale

Digital Potentiometers Applications

• Programmable gain amplifiers and variable attenuators
• Digital control of analog signal paths and bias voltages
• Audio volume control and tone adjustment circuits
• Sensor calibration and offset trimming systems

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'MF' corresponds to the DFN 3x3 package with exposed thermal pad as documented in the datasheet. Confirm that the 'T' suffix indicates tape and reel packaging if bulk quantities are required. Ensure the application design accounts for the volatile nature of the memory, requiring wiper settings to be reloaded after power cycles.

Digital Potentiometers Selection Notes

Select this component when an I²C controlled variable resistor with 8-bit precision is needed. The 5 kΩ value suits moderate current applications; higher resistance options exist in the same family. Note that while the serial interface functions down to 1.8V, analog performance specifications are guaranteed only between 2.7V and 5.5V. The high-voltage tolerant inputs allow interfacing with 5V logic even if the analog supply is lower.

Digital Potentiometers Part Context

This part belongs to the MCP45XX series of single-channel digital potentiometers. It shares the core architecture with the MCP453X (7-bit), MCP454X (nonvolatile), and MCP456X (nonvolatile) variants. The primary distinction of the MCP4551 is its combination of 8-bit resolution and volatile RAM storage, differentiating it from the nonvolatile EEPROM-based MCP4541 and MCP4561 models.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same package and specification include other MCP4551 variants with different resistance values (e.g., MCP4551-103E/MF for 10 kΩ). For nonvolatile requirements, the MCP4561T-502E/MF offers identical electrical characteristics but retains settings via EEPROM. Cross-package replacements require schematic redesign due to pinout differences.