MCP4642-103E/UN

Digital Potentiometers Overview

The MCP4642-103E/UN is a dual-channel digital potentiometer IC featuring nonvolatile memory and an I2C serial interface. It provides two independent rheostat configurations with 7-bit resolution, offering 128 taps (129 steps). The nominal resistance between terminals A and B is 10 kΩ with a ±20% tolerance. Operating voltage ranges from 1.8V to 5.5V, supporting standard, fast, and high-speed I2C modes up to 3.4 MHz. Key features include WiperLock™ technology for securing calibration settings, terminal disconnect capabilities via the TCON register, and high-voltage tolerant digital inputs up to 12.5V.

Digital Potentiometers Feature Summary

• Dual Rheostat Configuration: Two independent channels with 7-bit resolution (128 taps) and 10 kΩ nominal resistance.
• Nonvolatile Memory: Includes EEPROM for wiper settings and 10 general-purpose memory locations with WiperLock™ security.
• I2C Interface: Supports 100 kHz, 400 kHz, and 3.4 MHz clock speeds with hardware and software write protect options.
• High-Voltage Inputs: Digital input pins tolerate voltages up to 12.5V, allowing compatibility with higher voltage logic levels.

Digital Potentiometers Applications

• Industrial process control systems requiring adjustable gain or reference voltages.
• Audio equipment for digital volume control or tone adjustment.
• Calibration circuits in instrumentation where stable, nonvolatile resistor settings are required.
• Power supply regulation loops needing programmable feedback resistors.

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E' indicates RoHS compliance and lead-free status as per Microchip standards. Confirm the package type is MSOP-10 for surface mount assembly. Ensure the design supports the 1.8V minimum operating voltage if used in low-power applications, noting that full analog specifications are guaranteed from 2.7V upwards.

Digital Potentiometers Selection Notes

Select this model when dual independent variable resistors are needed with persistent state retention after power loss. The 10 kΩ value suits moderate current applications; lower values like 5 kΩ offer higher bandwidth but consume more current. Ensure the I2C bus speed requirements match the device's support for up to 3.4 MHz High-Speed mode if rapid updates are necessary.

Digital Potentiometers Part Context

This component belongs to the MCP46XX family of dual digital potentiometers. It shares the same core architecture and pinout as the MCP4641 (potentiometer configuration) and MCP4662 (8-bit resolution). The '103' code specifically denotes the 10 kΩ resistance value within this series.

Digital Potentiometers Replacement Considerations

Direct substitutes include other variants in the MCP464X family such as the MCP4641-103E/UN for potentiometer use or MCP4662-103E/UN for higher 8-bit resolution. Cross-family replacements like the MCP42XXX series require SPI interfaces and different pinouts, necessitating schematic redesigns.