MCP4242T-502E/UN

Digital Potentiometers Overview

The MCP4242T-502E/UN is a dual-channel digital potentiometer IC manufactured by Microchip Technology. It features two independent rheostat configurations with a total resistance (R_AB) of 5 kΩ and 129 discrete taps, providing 7-bit resolution. The device utilizes an SPI serial interface operating at frequencies up to 10 MHz for high-speed read/write access to wiper registers and non-volatile EEPROM. Key specifications include a typical wiper resistance of 75 Ω, a supply voltage range of 2.7V to 5.5V, and an extended operating temperature range from -40°C to +125°C. It incorporates WiperLock™ technology for secure calibration storage.

Digital Potentiometers Feature Summary

• Dual resistor network with 5 kΩ nominal resistance and 129 steps per channel
• Non-volatile memory with WiperLock™ technology for persistent wiper settings
• High-voltage tolerant digital inputs supporting up to 12.5V on control pins
• SPI interface compatible with modes 0,0 and 1,1 at clock rates up to 10 MHz

Digital Potentiometers Applications

• Industrial process control systems requiring adjustable gain or offset
• Audio equipment for volume control and tone adjustment
• Test and measurement instruments needing programmable attenuation
• Power supply circuits for reference voltage trimming

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm package type and tape/reel specifications. Ensure compatibility with system voltage levels, particularly noting that while analog operation supports 1.8V, specified electrical characteristics are guaranteed within the 2.7V to 5.5V range. Confirm moisture sensitivity level handling procedures prior to assembly.

Digital Potentiometers Selection Notes

Select this component when dual independent variable resistors are required in a compact surface-mount package. The 5 kΩ value suits applications demanding moderate current handling without excessive power dissipation. Consider the high-voltage tolerance of the SPI pins if interfacing with logic levels exceeding the VDD supply voltage. Verify that the 7-bit resolution meets the precision requirements of the target application.

Digital Potentiometers Part Context

This part belongs to the MCP414X/416X/424X/426X family of single and dual SPI digital potentiometers. The '42' designation indicates a dual rheostat configuration with non-volatile memory. The '502' suffix specifies the 5 kΩ resistance value, while 'UN' denotes the MSOP-10 package. It shares architectural similarities with volatile RAM-based variants like the MCP4232 but offers data retention capabilities.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include MCP4242T-503E/UN (10 kΩ), MCP4242T-502E/ML, and MCP4242T-502E/MS. For applications requiring higher resolution, consider the 8-bit MCP4262 series. Volatile alternatives such as the MCP4232 may be used if non-volatile storage is not required.