MCP40D18T-104AE/LTY

Overview

The MCP40D18T-104AE/LTY is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 7-bit resistor network providing 128 tap positions and operates in a potentiometer configuration. The device utilizes an I2C serial interface with command code support and volatile RAM memory for wiper settings. Key electrical parameters include a nominal resistance (RAB) of 100 kΩ, a supply voltage range of 1.8 V to 5.5 V, and a typical static current of 2.5 µA. It is housed in a compact SC70-6 surface-mount package.

Feature Summary

• 7-bit resolution with 128 discrete tap positions
• I2C protocol support including SMBus 2.0 Write/Read Byte and Word formats
• Volatile RAM memory with Power-on Reset (POR) defaulting to mid-scale
• Brown-out reset protection at approximately 1.5 V

Applications

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

Procurement Notes

Verify the specific ordering suffix 'E' for RoHS compliance and 'LTY' for tape-and-reel packaging when sourcing. Confirm that the 'A' designation corresponds to the 100 kΩ resistance value. Ensure the I2C bus timing requirements are met for the target operating frequency.

Selection Notes

Select this component for applications requiring a potentiometer configuration rather than a rheostat. The MCP40D18 differs from the MCP40D17 and MCP40D19 by its internal terminal connections suitable for voltage divider use. Verify that the 100 kΩ total resistance aligns with the circuit's impedance requirements.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 variant is specifically configured as a potentiometer, whereas the MCP40D17 and MCP40D19 are configured as rheostats. All three share the same SC70 package options and I2C interface capabilities.

Replacement Considerations

The MCP4018T-104E/LTY is a comparable device within the same family offering similar functionality. Note that the MCP4018 series uses a simplified I2C command format which may require firmware adjustments compared to the command code supported by the MCP40D18.