MCP4351-502E/ST

Digital Potentiometers Overview

The MCP4351-502E/ST is a quad-channel digital potentiometer IC manufactured by Microchip Technology. It features four independent 8-bit resistor networks with 257 taps, providing high resolution for precise analog control. The nominal resistance between terminals A and B is 5 kΩ, with a tolerance of ±20%. The device operates on a supply voltage ranging from 1.8V to 5.5V and utilizes a standard SPI serial interface for communication. It employs volatile memory to store wiper positions, which reset to mid-scale upon power-up or brown-out events.

Digital Potentiometers Feature Summary

• Quad configuration with four independent 8-bit potentiometers offering 257 discrete taps.
• SPI serial interface supporting clock frequencies up to 10 MHz in Modes 0,0 and 1,1.
• High-voltage tolerant digital inputs capable of withstanding up to 12.5V.
• Integrated reset input pin and brown-out reset protection for reliable operation.

Digital Potentiometers Applications

• Programmable gain amplifiers requiring precise gain adjustment.
• Voltage reference trimming in precision measurement systems.
• Audio volume control circuits utilizing the linear taper characteristic.
• Variable biasing networks in sensor signal conditioning paths.

Digital Potentiometers Procurement Notes

Verify the specific suffix 'ST' corresponds to the TSSOP-20 package when sourcing components. Confirm that the application design accommodates volatile memory behavior, as wiper settings are lost during power cycles. Ensure the SPI controller supports the required clock speeds and modes for proper register access.

Digital Potentiometers Selection Notes

Select this model for applications requiring four independent 5 kΩ resistive networks with 8-bit resolution. Consider the MCP4352 variant if rheostat configuration is preferred over potentiometer mode. Verify that the system voltage remains within the 1.8V to 5.5V range to ensure compliance with electrical specifications.

Digital Potentiometers Part Context

This component belongs to the MCP43X series of quad digital potentiometers. It shares architectural similarities with the MCP4331 (7-bit) and MCP4361 (non-volatile) variants. The primary distinction lies in its 8-bit resolution and volatile RAM storage, differentiating it from non-volatile EEPROM-based models in the same family.

Digital Potentiometers Replacement Considerations

Direct functional substitutes include the MCP4351-503E/ST for 50 kΩ resistance or MCP4351-102E/ST for 10 kΩ resistance. For lower resolution needs, the MCP4331-502E/ST offers identical pinout with 7-bit accuracy. Non-volatile alternatives such as the MCP4361-502E/ST retain settings across power cycles but require a minimum operating voltage of 2.7V.