MCP40D18T-503AE/LTY

Overview

The MCP40D18T-503AE/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 50 kΩ with 128 tap positions. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of 260 kHz at the specified resistance, and low power consumption with a static current of 2.5 µA. It includes brown-out reset protection and defaults to mid-scale upon power-up.

Feature Summary

• 7-bit resolution providing 128 discrete tap positions for precise resistance adjustment
• I2C protocol support including SMBus 2.0 Write Byte/Word and Read Byte/Word formats
• Configurable as a potentiometer or rheostat with zero scale to full scale wiper operation
• Brown-out reset protection with a typical threshold of 1.5V and power-on mid-scale default

Applications

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

Procurement Notes

Verify the specific ordering suffix 'E/LTY' against the manufacturer's official documentation to confirm package type and tape/reel specifications. Ensure the design supports the I2C address '0111110' which is unique to the MCP40D18 variant compared to other devices in the family.

Selection Notes

Select this component when a single-channel digital potentiometer with I2C command code support is required. The 50 kΩ resistance value suits applications needing moderate impedance levels. Consider the volatile memory nature, as settings are lost upon power loss, necessitating re-initialization from mid-scale.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 specifically distinguishes itself by offering a potentiometer configuration option and a dedicated I2C device address of '0111110', whereas the MCP40D17 and MCP40D19 share the address '0101110'.

Replacement Considerations

The MCP4018T-503E/LTY is a parameter-equivalent alternative within the same family, though it utilizes a simplified I2C command format rather than the command code supported by the MCP40D18.