MCP4542-503E/MS

Digital Potentiometers Overview

The MCP4542-503E/MS is a single-channel digital rheostat manufactured by Microchip Technology, housed in an 8-pin MSOP package. It features a 7-bit resistor network providing 129 taps with a nominal resistance (R_AB) of 50 kΩ and a ±20% tolerance. The device utilizes nonvolatile EEPROM memory to retain wiper settings and supports I²C serial communication at standard, fast, and high-speed modes. Operating voltage ranges from 2.7V to 5.5V for full specifications, with operation down to 1.8V for the serial interface only. It includes WiperLock™ technology and operates within an extended temperature range of -40°C to +125°C.

Digital Potentiometers Feature Summary

• Nonvolatile Memory: Stores wiper position in EEPROM with automatic recall upon power-up.
• I²C Interface: Supports 100 kHz, 400 kHz, and up to 3.4 MHz High-Speed mode.
• WiperLock™ Technology: Allows calibration settings to be secured against modification.
• High-Voltage Tolerant Inputs: Digital inputs tolerate voltages up to 12.5V.

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference trimming
• Sensor bias adjustment

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E' indicates RoHS compliance and the '/MS' denotes the MSOP-8 package. Confirm that the '-503' code corresponds to the 50 kΩ resistance value. Ensure the application environment stays within the specified absolute maximum ratings to prevent permanent damage.

Digital Potentiometers Selection Notes

Select this model when a single-channel variable resistor configuration is required with persistent memory. The 50 kΩ resistance value suits moderate impedance applications. Verify that the system's I²C bus speed does not exceed the limits defined for the chosen supply voltage, particularly for High-Speed mode which requires V_DD ≥ 4.5V.

Digital Potentiometers Part Context

This component belongs to the MCP454X family of single-channel I²C digital potentiometers with nonvolatile memory. It shares architectural similarities with the MCP456X series but offers 7-bit resolution compared to the 8-bit variants. It is distinct from the volatile MCP453X series and the dual-channel MCP464X series.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same family include the MCP4541-503E/MS (Potentiometer configuration) or the MCP4562-503E/MS (8-bit resolution). Cross-family substitutes like the MCP4242 require SPI interfaces and are not pin-compatible.

Digital Potentiometers FAQ

What is the difference between the MCP4542 and MCP4541?

The MCP4542 is configured as a Rheostat (variable resistor), while the MCP4541 is configured as a Potentiometer. Electrically, they share the same internal architecture and memory features.

Does the device support High-Speed I²C mode?

Yes, the MCP4542 supports I²C High-Speed mode up to 3.4 MHz, provided the supply voltage (V_DD) is between 4.5V and 5.5V and bus capacitance is ≤ 100 pF.

How is the wiper setting preserved during power loss?

The device uses Nonvolatile EEPROM memory. The current wiper setting is automatically saved and recalled upon power-up, ensuring the resistance state is maintained without external intervention.