MCP40D17T-502E/LT

Overview

The MCP40D17T-502E/LT is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 5 kΩ end-to-end resistance (R_AB) with 128 discrete tap positions, providing 7-bit resolution. 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 SMBus 2.0 protocol formats. The component is housed in a compact SC70-6 surface-mount package.

Feature Summary

• 7-bit resolution with 128 tap positions and 5 kΩ nominal resistance
• I²C serial interface supporting SMBus 2.0 Read/Write Byte/Word protocols
• Volatile RAM memory with Power-on Reset (POR) defaulting to mid-scale (3Fh)
• Low static current consumption of 2.5 µA typical

Applications

• Amplifier gain control and offset adjustment
• Sensor calibration for pressure, temperature, position, optical, and chemical sensors
• Set point or offset trimming
• Cost-sensitive mechanical trim pot replacement
• RF amplifier biasing

Procurement Notes

Verify the specific suffix 'LT' corresponds to the SC70-6 package and tape-and-reel delivery format as defined in the official datasheet. Confirm that the '502' code accurately specifies the 5 kΩ resistance value. Ensure compatibility with the required I²C address '0101110' and check for any RoHS compliance documentation relevant to the manufacturing batch.

Selection Notes

Select this component when a rheostat configuration is required rather than a potentiometer setup. The MCP40D17 is distinct from the MCP40D18, which offers potentiometer functionality. Consider the 5 kΩ resistance value against system impedance requirements and verify that the 128-step resolution meets the necessary precision for the application's gain or calibration needs.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D17 specifically designates the rheostat configuration variant. It shares the same core architecture and I²C interface as the MCP40D18 (potentiometer) and MCP40D19 (rheostat in SC70-5), differing primarily in terminal configuration and package pinout.

Replacement Considerations

The MCP4017T-502E/LT is a parameter-equivalent alternative within the same product family. Both devices offer identical electrical specifications, including 5 kΩ resistance, 128 taps, and I²C control, but may differ in command code simplicity or specific revision details.