MCP40D18T-103AE/LT

Overview

The MCP40D18T-103AE/LT is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 10 kΩ nominal resistance (indicated by the '103' suffix) with 7-bit resolution, providing 128 discrete tap positions. The device utilizes an I²C serial interface for control and includes volatile RAM memory to retain wiper settings during operation. It operates within a supply voltage range of 1.8V to 5.5V and supports both potentiometer and rheostat configurations. The component is housed in a compact SC70-6 surface-mount package.

Feature Summary

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

Applications

• Amplifier gain control and offset adjustment
• Sensor calibration for pressure, temperature, and optical sensors
• Set point or offset trimming in electronic circuits
• Replacement for mechanical trim potentiometers
• LCD brightness and contrast adjustment

Procurement Notes

Verify the specific ordering suffix 'E/LT' against the manufacturer's latest documentation to confirm package type and tape/reel specifications. Ensure the I²C address configuration matches the system requirements, as the MCP40D18 may offer alternative addresses depending on the exact variant. Confirm that the volatile memory behavior aligns with the application's power-loss handling needs.

Selection Notes

Select this component when a low-profile SC70-6 package is required for space-constrained designs. Choose this model over the MCP40D17 or MCP40D19 if the application specifically requires a potentiometer configuration rather than a rheostat. Ensure the system voltage remains within the 1.8V to 5.5V range to maintain specified analog performance characteristics.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 variant is distinct from the MCP40D17 and MCP40D19 primarily due to its internal wiring, which supports a true three-terminal potentiometer configuration instead of a two-terminal rheostat setup. All devices in this family share similar electrical characteristics and I²C control logic.

Replacement Considerations

The MCP4018T series serves as a parameter-equivalent replacement within the same family. Verify pin compatibility and I²C address settings when substituting, as some variants may have simplified command formats affecting data throughput.