MCP40D18T-104E/LT

Overview

The MCP40D18T-104E/LT is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 7-bit resistor network providing 128 tap positions and operates via an I2C serial interface with command code support. The device offers a nominal resistance of 100 kΩ (suffix -104) and utilizes volatile RAM for wiper position storage. It supports a wide operating voltage range from 1.8V to 5.5V, ensuring compatibility with various logic levels. Key electrical characteristics include a typical wiper resistance of 100Ω and low temperature coefficients. The component is housed in a compact SC70-6 surface-mount package.

Feature Summary

• 7-bit resolution with 128 discrete tap positions for precise resistance adjustment
• I2C serial interface supporting SMBus 2.0 Write Byte/Word and Read Byte/Word protocols
• Configurable as a potentiometer or rheostat with standard address '0111110'
• Brown-out reset protection with power-on default wiper setting at mid-scale

Applications

• Amplifier gain control and offset adjustment circuits
• Sensor calibration for pressure, temperature, position, optical, and chemical sensors
• Set point or offset trimming in electronic systems
• RF amplifier biasing networks
• LCD brightness and contrast adjustment modules

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm pinout and package configuration. Ensure the I2C bus speed requirements align with the device's AC timing specifications for reliable communication. Confirm that the system design accounts for the volatile nature of the memory, requiring wiper re-initialization upon power cycles.

Selection Notes

Select this model when a single-channel digital potentiometer with I2C control is required. The 100 kΩ resistance value suits applications needing higher impedance networks. Consider the SC70-6 package size for space-constrained PCB layouts. Verify that the 1.8V to 5.5V supply range matches the target system voltage rails.

Part Context

This component belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 variant is specifically distinguished by its potentiometer configuration option, whereas other family members may offer rheostat configurations. All devices in this series share similar electrical characteristics and interface protocols but differ in terminal availability and internal connection schemes.

Replacement Considerations

The MCP4018T-104E/LT is a parameter-equivalent alternative within the same product family. Both devices share identical electrical specifications, interface protocols, and functionality. Verify package compatibility and pin assignments before substitution.