MCP4642T-503E/UN

Digital Potentiometers Overview

The MCP4642T-503E/UN is a dual-channel digital potentiometer IC from Microchip Technology, featuring nonvolatile memory and an I2C serial interface. It provides two independent rheostat configurations with 7-bit resolution (128 taps) and a nominal resistance of 50 kΩ. The device operates within a supply voltage range of 2.7V to 5.5V for full specifications, supporting standard, fast, and high-speed I2C modes up to 3.4 MHz. Key features include WiperLock™ technology for securing calibration settings, hardware write protection via the WP pin, and high-voltage tolerant inputs on the HVC/A0 pin up to 12.5V. It is housed in a 10-pin MSOP package.

Digital Potentiometers Feature Summary

• Dual Rheostat Configuration: Two independent resistor networks with 7-bit resolution (129 steps) and 50 kΩ nominal resistance.
• Nonvolatile Memory: Includes EEPROM for wiper settings and 10 general-purpose memory locations; supports WiperLock™ technology.
• High-Speed I2C Interface: Supports 100 kHz, 400 kHz, and High-Speed mode up to 3.4 MHz.
• Wide Operating Range: Supply voltage 2.7V to 5.5V; extended temperature range -40°C to +125°C.

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference adjustment
• Digital volume control in audio systems

Digital Potentiometers Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging when ordering. Confirm the '503' code corresponds to the 50 kΩ resistance value. Ensure the 'E' suffix meets RoHS compliance requirements. Check the 'UN' suffix for the specific MSOP-10 package variant. Cross-reference the full part number with official Microchip documentation to confirm current production status.

Digital Potentiometers Selection Notes

Select this model for applications requiring dual isolated variable resistors controlled via I2C. The 50 kΩ resistance value suits moderate impedance circuits. Choose this over volatile variants if power-down retention of wiper positions is required. Verify that the system's I2C bus speed does not exceed 3.4 MHz. Ensure the design accommodates the 10-pin MSOP footprint and thermal requirements.

Digital Potentiometers Part Context

This component belongs to the MCP464X family of dual digital potentiometers. The '42' designation indicates a 7-bit resolution with nonvolatile memory. The '503' suffix specifies the 50 kΩ resistance value. The 'T' denotes reel packaging, while 'UN' identifies the MSOP-10 package type. It shares the same core architecture as the MCP4641 but differs in terminal configuration.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include MCP4642-503E/UN (tube packaging). For single-channel needs, consider the MCP4542 series. For higher resolution, the MCP4662 offers 8-bit resolution. Ensure any substitute matches the I2C addressability and voltage tolerance requirements.