MCP4251-103E/ST

Digital Potentiometers Overview

The MCP4251-103E/ST is a dual-channel, 8-bit digital potentiometer IC manufactured by Microchip Technology. It features two independent resistor networks with 256 taps (257 steps) and a nominal resistance of 10 kΩ. The device operates via an SPI serial interface supporting modes 0,0 and 1,1 at frequencies up to 10 MHz. It utilizes volatile RAM memory for wiper settings, which reset to mid-scale upon power-up or brown-out events. Key electrical characteristics include a typical wiper resistance of 75 Ω, a supply voltage range of 2.7 V to 5.5 V, and high-voltage tolerant digital inputs capable of withstanding up to 12.5 V.

Digital Potentiometers Feature Summary

• Dual 8-bit resistor networks providing 256 taps per channel
• SPI serial interface with support for 10 MHz clock speeds
• High-voltage tolerant digital inputs rated up to 12.5 V
• Volatile memory configuration with mid-scale power-on reset

Digital Potentiometers Applications

• Programmable gain amplifiers
• Variable voltage references
• Audio volume control circuits
• Sensor bias adjustment

Digital Potentiometers Procurement Notes

Verify the specific package marking and date code against the manufacturer's latest documentation to ensure authenticity. Confirm that the system design accommodates the volatile nature of the memory, as wiper positions will revert to mid-scale following any power cycle or brown-out event.

Digital Potentiometers Selection Notes

Select this component when a dual-channel digital potentiometer with SPI control is required. Ensure the application voltage does not exceed the 12.5 V limit on digital input pins. For applications requiring non-volatile storage of wiper positions, consider alternative models within the MCP42XX family that feature EEPROM memory instead of RAM.

Digital Potentiometers Part Context

This part belongs to the MCP413X/415X/423X/425X family of single and dual digital potentiometers. The '51' suffix indicates an 8-bit resolution with dual potentiometer configuration. The '103' suffix denotes a 10 kΩ resistance value, while '/ST' specifies the TSSOP-14 surface-mount package.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include the MCP4251-103E/ML (QFN package) or MCP4251-103E/SN (SOIC package). Verify pinout compatibility and thermal performance differences when substituting packages.