MCP40D19T-103E/LT

Overview

The MCP40D19T-103E/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 memory retention. The device operates via an I2C serial interface with standard address '0101110'. It supports a wide supply voltage range of 1.8V to 5.5V, with analog characteristics specified from 2.7V to 5.5V. The -103 suffix indicates a nominal resistance (R_AB) of 10 kΩ ±20%. Packaged in a compact SC-70-5 surface-mount format, it offers low power consumption and extended temperature operation.

Feature Summary

• 7-bit resolution with 128 discrete tap steps for precise resistance adjustment
• I2C serial interface supporting SMBus 2.0 Write Byte/Word and Read Byte/Word protocols
• Configurable as a rheostat with terminals A, W, and B; includes Brown-out Reset protection at 1.5V typical
• Low static current consumption of 2.5 µA typical when the serial interface is inactive

Applications

• Amplifier gain control and offset adjustment circuits
• Sensor calibration for pressure, temperature, position, optical, and chemical sensors
• Set point or offset trimming in electronic systems
• Replacement for mechanical trim potentiometers in cost-sensitive designs
• RF amplifier biasing networks

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure the I2C bus voltage levels are compatible with the system logic, noting that digital thresholds scale with VDD. Confirm that the application design accounts for the volatile nature of the internal RAM, requiring wiper state restoration upon power-up.

Selection Notes

Select this component for applications requiring a single-channel digital potentiometer with I2C control and minimal footprint. The 10 kΩ resistance value suits moderate impedance loads. Note that while the device operates down to 1.8V, AC/DC electrical specifications are guaranteed only between 2.7V and 5.5V. For non-volatile memory requirements, consider alternative devices such as the MCP4021 series.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D19 variant is specifically configured for rheostat operation in a 5-pin SC-70 package. It shares core architecture with the MCP40D17 (SC-70-6) and MCP40D18 (potentiometer configuration), differing primarily in pinout and terminal availability.

Replacement Considerations

The MCP4019T-103E/LT is a parameter-equivalent substitute within the same product family, offering identical electrical characteristics and functionality.