MCP40D18T-104AE/LT

Overview

The MCP40D18T-104AE/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 in a potentiometer configuration. The device utilizes an I2C serial interface with command code support and includes volatile RAM for wiper position storage. Key electrical parameters include a nominal resistance (RAB) of 100 kΩ, a typical wiper resistance of 100 Ω, and a supply voltage range of 1.8 V to 5.5 V. It offers low power consumption with a typical static current of 2.5 µA and supports SMBus 2.0 protocols.

Feature Summary

• 7-bit resolution with 128 discrete tap positions for precise resistance adjustment.
• I2C serial interface supporting standard addresses '0101110' and '0111110', compatible with SMBus 2.0.
• Potentiometer configuration with volatile memory retaining wiper settings during operation.
• Extended temperature range operation from -40°C to +125°C.

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.
• Replacement for cost-sensitive mechanical trim potentiometers.
• LCD brightness and contrast adjustment modules.

Procurement Notes

Verify the specific ordering suffix 'E/LT' against the manufacturer's current documentation to confirm package type and tape/reel specifications. Ensure the I2C address configuration matches the system requirements, as this variant supports dual addressing options. Confirm that the volatile memory behavior aligns with the application's power-loss data retention needs.

Selection Notes

Select this component when a potentiometer configuration is required rather than a rheostat. The 100 kΩ resistance value suits applications requiring higher impedance networks. Verify that the 1.8 V minimum operating voltage meets the system's lowest supply rail, noting that analog characteristics are specified from 2.7 V upwards. Consider the SC70-6 package dimensions for PCB layout constraints.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 specifically denotes the potentiometer configuration variant housed in a 6-lead SC70 package. It differs from the MCP40D17 and MCP40D19, which are configured as rheostats. The '104' suffix indicates the 100 kΩ resistance value, while 'LT' typically refers to the lead-free SC70 packaging.

Replacement Considerations

The MCP4018T-104E/LT serves as a functional substitute within the same family, offering identical electrical characteristics but utilizing a simplified I2C command format for potentially higher data throughput. Both devices share the same pinout and configuration options.