MCP4642T-103E/MF

Digital Potentiometers Overview

The MCP4642T-103E/MF 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 discrete taps per channel. The nominal resistance between terminals A and B is 10 kΩ (±20% tolerance). Operating voltage ranges from 2.7V to 5.5V for specified characteristics, with operation down to 1.8V supported. Key features include WiperLock™ technology for securing calibration settings in EEPROM, high-voltage tolerant inputs up to 12.5V, and a typical inactive current of 2.5 µA.

Digital Potentiometers Feature Summary

• Dual resistor network with 7-bit resolution (129 steps) and 10 kΩ nominal resistance
• Nonvolatile memory with WiperLock™ technology and 10 general-purpose EEPROM locations
• I2C serial interface supporting 100 kHz, 400 kHz, and 3.4 MHz High-Speed modes
• High-voltage tolerant digital inputs (up to 12.5V) and hardware/software write protect

Digital Potentiometers Applications

• Calibration storage for sensor offset or gain adjustment
• Variable gain control in audio or signal processing circuits
• Programmable biasing and reference voltage setting
• System configuration and parameter tuning via microcontroller

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'MF' corresponds to the DFN 3x3 package with exposed thermal pad as defined in the datasheet. Confirm that the 'T' indicates tape-and-reel packaging. Ensure the design accounts for the extended temperature range (-40°C to +125°C) and the specific electrical characteristics valid at VDD ≥ 2.7V.

Digital Potentiometers Selection Notes

Select this component when dual independent rheostats with nonvolatile retention are required. The 7-bit resolution provides 128 steps, suitable for applications not requiring fine 8-bit granularity. Verify that the 10 kΩ resistance value fits the circuit's power and bandwidth requirements, noting the typical 2 MHz bandwidth for lower resistance values.

Digital Potentiometers Part Context

This device belongs to the MCP45XX/46XX family of I2C digital potentiometers. The '46' prefix denotes a dual-resistor network, while '45' indicates a single network. The '2' suffix specifies rheostat configuration, whereas '1' indicates potentiometer configuration. This model uses nonvolatile EEPROM memory, distinguishing it from volatile RAM-based counterparts like the MCP4632.

Digital Potentiometers Replacement Considerations

For single-channel replacement, consider the MCP4542T-103E/MF. For higher resolution, the MCP4662T-103E/MF offers 8-bit resolution. If volatile memory is acceptable, the MCP4632T-103E/MF provides a similar form factor without EEPROM.