MCP4442-103E/ST

Digital Potentiometers Overview

The MCP4442-103E/ST is a quad-channel digital potentiometer IC featuring nonvolatile memory and an I2C serial interface. It provides four independent rheostat configurations with a nominal resistance of 10 kΩ (±20%) and 7-bit resolution, offering 129 taps per channel. The device operates within a supply voltage range of 2.7V to 5.5V and supports I2C clock frequencies up to 3.4 MHz. Key features include WiperLock™ technology for automatic wiper recall, hardware write protection via the WP pin, and high-voltage tolerant digital inputs capable of withstanding up to 12.5V. It is housed in a TSSOP-14 package.

Digital Potentiometers Feature Summary

• Quad Rheostat Configuration: Four independent channels with 10 kΩ nominal resistance and 7-bit (129 tap) resolution.
• Nonvolatile Memory: Includes WiperLock™ technology for automatic power-up recall and five general-purpose EEPROM locations.
• High-Speed Interface: Supports I2C communication at standard (100 kHz), fast (400 kHz), and high-speed (up to 3.4 MHz) modes.
• High-Voltage Inputs: Digital input pins (HVC/A0, SDA, SCL, etc.) are tolerant up to 12.5V, allowing operation with higher voltage logic levels.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifiers and sensor signal conditioning
• Voltage reference trimming and calibration systems
• Industrial process control requiring isolated or high-voltage tolerant adjustments

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E/ST' corresponds to the TSSOP-14 package and industrial temperature grade (-40°C to +125°C). Confirm that the '103' designation matches the required 10 kΩ resistance value for the application. Ensure the design accounts for the nonvolatile nature of the wiper settings and the availability of the I2C address configuration via the HVC/A0 pin.

Digital Potentiometers Selection Notes

Select this component when a quad-channel rheostat with persistent memory settings is required. The 7-bit resolution offers a balance between precision and speed. Consider the MCP4462 if 8-bit (257 tap) resolution is needed, or the MCP4441 if potentiometer configuration is preferred over rheostat. Verify that the system's I2C bus capacitance limits allow for the desired clock frequency, as 3.4 MHz requires low bus capacitance (≤100 pF).

Digital Potentiometers Part Context

This part belongs to the MCP444X/446X family of 7/8-bit quad digital potentiometers with nonvolatile memory. It shares the same core architecture and feature set as the MCP4441 (potentiometer version) and MCP4462 (8-bit version), differing primarily in the number of taps, terminal configuration, and resistance value indicated by the ordering suffix.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same family include the MCP4442-502E/ST (5 kΩ), MCP4442-503E/ST (50 kΩ), and MCP4442-104E/ST (100 kΩ). For higher resolution, the MCP4462-103E/ST provides 8-bit resolution in the same package. Cross-family replacement with volatile devices like the MCP4432 requires software handling for state restoration upon power loss.