MCP40D17T-503E/LT

Overview

The MCP40D17T-503E/LT is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 50 kΩ total resistance (R_AB) with 7-bit resolution, providing 128 discrete wiper steps. The device utilizes an I²C serial interface for control and includes volatile RAM memory to retain the wiper setting during operation. It operates within a supply voltage range of 1.8V to 5.5V and supports standard and fast-mode I²C protocols. The component is housed in a compact SC70-6 surface-mount package.

Feature Summary

• 7-bit resolution with 128 wiper positions and linear taper
• I²C serial interface supporting SMBus 2.0 Read/Write Byte/Word formats
• Volatile RAM memory with Power-on Reset (POR) defaulting to mid-scale (3Fh)
• Brown-out reset protection at approximately 1.5V typical

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
• Cost-sensitive replacement for mechanical trim potentiometers
• RF amplifier biasing networks

Procurement Notes

Verify the specific suffix 'LT' corresponds to the SC70-6 package and tape-and-reel shipping format as defined in the official datasheet. Confirm that the '503' code accurately specifies the 50 kΩ resistance value. Ensure the system design accounts for the volatile nature of the internal RAM, requiring wiper settings to be re-established after power cycles.

Selection Notes

Select this component when a single-channel digital potentiometer with I²C control is required. The 50 kΩ resistance value suits applications needing moderate impedance levels. The SC70-6 package is suitable for space-constrained designs. Note that the MCP40D17 is configured specifically for rheostat operation; verify if potentiometer configuration is needed, which would require the MCP40D18 variant.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D17 variant is distinctively configured for rheostat operation, whereas the MCP40D18 offers potentiometer configuration. Both share the same SC70-6 package and I²C interface capabilities, differing primarily in terminal connectivity and internal wiring for the wiper position.

Replacement Considerations

The MCP4017T-503E/LTY is a parameter-equivalent alternative within the same product family. It shares identical electrical characteristics, including the 50 kΩ resistance, 128 steps, and SC70-6 packaging. Verify pin compatibility and software command set alignment before substitution.