MCP40D18T-103AE/LTY

Overview

The MCP40D18T-103AE/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 (R_AB) of 10 kΩ, a supply voltage range of 1.8V to 5.5V, and a typical static current of 2.5 µA. It is housed in a compact SC-70-6 surface-mount package and supports operation across an extended temperature range of -40°C to +125°C.

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.
• Potentiometer configuration with zero-scale to full-scale wiper operation.
• Low power consumption with 2.5 µA typical static current and brown-out reset protection.

Applications

• PC Servers utilizing I2C protocol with command code.
• Amplifier gain control and offset adjustment circuits.
• Sensor calibration for pressure, temperature, position, optical, and chemical sensors.
• Set point or offset trimming applications.
• RF amplifier biasing networks.

Procurement Notes

Verify the specific ordering suffix 'LTY' against the manufacturer's official documentation to confirm the tape-and-reel packaging quantity and any associated handling requirements. Ensure that the 'E' designation aligns with the required environmental compliance standards for the target application. Cross-reference the datasheet revision date to confirm the validity of the electrical specifications provided.

Selection Notes

Select this component when a single-channel digital potentiometer with I2C control is required. The 10 kΩ resistance value suits moderate impedance applications. The volatile memory type necessitates re-initialization upon power-up if state retention is critical. Confirm that the SC-70-6 package dimensions fit the available PCB real estate and that the 1.8V to 5.5V supply range matches the system voltage rails.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 variant is specifically distinguished by its potentiometer configuration, whereas the MCP40D17 and MCP40D19 offer rheostat configurations. All devices in this series share similar electrical characteristics, including the I2C interface and low-power operation, but differ in terminal connectivity and internal switch topology.

Replacement Considerations

The MCP4018T-103E/LTY is a parameter-equivalent alternative within the same family. Verify pin compatibility and interface protocol differences, as some variants may utilize simplified command formats affecting data throughput. Ensure the replacement maintains the required SC-70-6 footprint and electrical performance specifications.