MCP4142-502E/SN

Digital Potentiometers Overview

The MCP4142-502E/SN is a single-channel digital rheostat manufactured by Microchip Technology. It features a 7-bit resolution providing 129 tap positions and a nominal resistance of 5 kΩ (indicated by the -502 suffix). The device utilizes an SPI serial interface for control and includes non-volatile memory with WiperLock™ technology to retain wiper settings after power loss. It operates within a supply voltage range of 2.7V to 5.5V, supports high-voltage tolerant digital inputs up to 12.5V, and functions across an extended temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Non-volatile Memory: Stores wiper settings using WiperLock™ technology for automatic recall upon power-up.
• SPI Interface: Supports 10 MHz operation in modes 0,0 and 1,1 with hardware and software write protect options.
• High-Voltage Inputs: Digital input pins tolerate voltages up to 12.5V, enabling split-rail applications.
• Rheostat Configuration: Single resistor network with 129 steps and typical wiper resistance of 75 Ω.

Digital Potentiometers Applications

• Precision gain adjustment in instrumentation amplifiers
• Voltage reference trimming
• Programmable attenuation in signal conditioning circuits

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'SN' corresponds to the SOIC-8 package and 'E' indicates RoHS compliance. Confirm the '-502' code specifies the 5 kΩ resistance value. Ensure the application environment stays within the specified 2.7V to 5.5V supply range and -40°C to +125°C temperature limits.

Digital Potentiometers Selection Notes

Select this model over potentiometer variants (e.g., MCP4141) when a two-terminal variable resistor configuration is required. The 7-bit resolution offers 129 steps; choose the MCP4162 series if 8-bit resolution (257 steps) is necessary. Verify that the 5 kΩ resistance aligns with the circuit's current and impedance requirements.

Digital Potentiometers Part Context

This component belongs to the MCP414X/416X family of single/dual SPI digital potentiometers with non-volatile memory. The MCP4142 specifically denotes the single rheostat variant with 7-bit resolution. It shares the same pinout and core functionality as the MCP4141 but differs in terminal configuration.

Digital Potentiometers Replacement Considerations

MCP4142-503E/SN (50 kΩ version)

Digital Potentiometers FAQ

What is the difference between MCP4142 and MCP4141?

The MCP4142 is configured as a rheostat (variable resistor), while the MCP4141 is configured as a potentiometer. Electrically, they are identical except for the internal connection of the terminals.

How does WiperLock™ technology work?

WiperLock™ allows the current wiper setting to be saved into the internal Data EEPROM. Upon power-up, the device automatically recalls this stored setting, eliminating the need for external calibration or initialization sequences.

Can the digital inputs handle voltages higher than VDD?

Yes, the CS, SDI, SCK, WP, and SHDN pins are high-voltage tolerant and can withstand up to 12.5V, even if VDD is lower, facilitating use in split-rail systems.