MCP40D19T-502E/LT

Overview

The MCP40D19T-502E/LT is a single-channel digital potentiometer manufactured by Microchip Technology. It features a 7-bit resistor network providing 128 tap positions and operates in a rheostat configuration. The total resistance between terminals A and B is nominally 5 kΩ with a ±20% tolerance. Control is managed via an I²C serial interface supporting SMBus protocols. The device utilizes volatile RAM for wiper settings, which reset to mid-scale upon power-up. It supports a wide operating voltage range of 1.8V to 5.5V and includes brown-out reset protection.

Feature Summary

• 7-bit resolution with 128 discrete tap positions
• I²C serial interface compatible with SMBus 2.0
• Rheostat configuration with 5 kΩ nominal resistance
• Low static current consumption of 2.5 µA typical

Applications

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

Procurement Notes

Verify the specific suffix 'LT' corresponds to the SC70-5 package variant when sourcing. Confirm that the volatile memory type requires external circuitry if non-volatile retention across power cycles is necessary for the application design.

Selection Notes

Select this component for applications requiring a compact SC70-5 footprint and I²C control. Ensure the system voltage falls within the 1.8V to 5.5V range. Note that analog characteristics are specified from 2.7V to 5.5V, while digital operation extends down to 1.8V.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D19 specifically denotes the rheostat configuration housed in the 5-lead SC70 package, distinguishing it from the MCP40D17 (SC70-6) and MCP40D18 (Potentiometer/SC70-6).

Replacement Considerations

MCP4019T-502E/LT offers identical electrical specifications but uses a simplified I²C command format for higher data throughput.