MCP40D18T-502AE/LT

Overview

The MCP40D18T-502AE/LT is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 7-bit resistor network providing 128 tap positions and utilizes volatile RAM for wiper storage. The device operates via an I2C serial interface with command code support and SMBus 2.0 compatibility. It offers configurable potentiometer or rheostat modes, a wide supply voltage range of 1.8V to 5.5V, and low static current consumption. Packaged in a compact SC70-6 form factor, it supports extended industrial temperature ranges from -40°C to +125°C.

Feature Summary

• 7-bit resolution with 128 discrete tap positions
• I2C serial interface supporting SMBus 2.0 protocols
• Configurable as Potentiometer or Rheostat
• Low power operation with 2.5 µA typical static current

Applications

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

Procurement Notes

Verify the specific ordering suffix 'AE' against official Microchip documentation to confirm package type and tape/reel specifications. Confirm that the 'LTY' variant designation aligns with the required packaging format for automated assembly processes.

Selection Notes

Select this component when a single-channel digital potentiometer with I2C control is required. Ensure the application utilizes volatile memory capabilities, as settings are lost upon power loss. Verify that the 128-step resolution meets the circuit's precision requirements.

Part Context

This part belongs to the MCP40D17/18/19 family of digital potentiometers. The MCP40D18 specifically designates the device configured for potentiometer mode, distinguishing it from the rheostat-only MCP40D17 and MCP40D19 variants within the same series.

Replacement Considerations

MCP4018T-502E/LT: Offers simplified I2C command format for higher throughput but lacks the full command code feature set.