MCP40D18T-104E/LTY

Overview

The MCP40D18T-104E/LTY is a single-channel, 7-bit volatile digital potentiometer manufactured by Microchip Technology. It features an I2C serial interface with command code support and operates within a supply voltage range of 1.8V to 5.5V. The device offers a nominal resistance (RAB) of 100 kΩ with a tolerance of ±20%. It provides 128 tap positions for precise adjustment and utilizes RAM for wiper storage. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of 100 kHz at full scale, and low power consumption with a static current of 2.5 µA.

Feature Summary

• 7-bit resolution providing 128 discrete tap positions
• I2C protocol support including SMBus 2.0 Read/Write Byte/Word formats
• Potentiometer configuration with standard address '0101110' or alternate '0111110'
• Brown-out reset protection and Power-on Reset to mid-scale

Applications

• PC Servers utilizing I2C Protocol with Command Code
• Amplifier Gain Control and Offset Adjustment
• Sensor Calibration for Pressure, Temperature, Position, Optical, and Chemical applications
• Set Point or Offset Trimming
• RF Amplifier Biasing

Procurement Notes

Verify the specific ordering suffix 'LTY' against the manufacturer's official documentation to confirm package type and tape/reel specifications. Ensure the selected variant matches the required I2C device address ('0101110' or '0111110') as this parameter is defined by the part number structure.

Selection Notes

Select the MCP40D18T-104E/LTY when a 100 kΩ potentiometer configuration is required rather than a rheostat. This model supports two distinct I2C addresses, offering flexibility in multi-device bus systems. Verify that the system voltage remains above 1.8V for full digital operation and consider the 100 kΩ bandwidth limitation of 100 kHz for high-speed signal paths.

Part Context

This component belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 specifically denotes the potentiometer configuration variant housed in an SC70-6 package. It shares core architecture with the MCP40D17 and MCP40D19 but differs in terminal configuration and available I2C addressing options.

Replacement Considerations

The MCP4018T-104E/LTY serves as a parameter-equivalent alternative within the same family. Both devices offer identical 100 kΩ resistance, 128 taps, and I2C interfaces. Designers should verify pinout compatibility and ensure the simplified command format of the MCP4018 series meets the host controller's communication requirements.