MCP40D17T-103E/LT

Overview

The MCP40D17T-103E/LT is a single-channel digital potentiometer featuring an I2C serial interface with command code support. It offers 7-bit resolution, providing 128 discrete wiper positions within a rheostat configuration. The nominal resistance between terminals A and B is 10 kΩ (±20% tolerance). The device operates on a supply voltage range of 1.8V to 5.5V, with analog characteristics specified from 2.7V to 5.5V. It includes volatile RAM memory for wiper settings and supports SMBus 2.0 protocols.

Feature Summary

• 7-bit resolution with 128 steps and 10 kΩ nominal resistance
• I2C control interface supporting SMBus 2.0 Read/Write Byte/Word formats
• SC70-6 package with low power consumption (2.5 µA typical static current)
• Brown-out reset protection and power-on default mid-scale setting

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
• RF amplifier biasing applications
• LCD brightness and contrast adjustment

Procurement Notes

Verify the specific suffix 'LT' corresponds to the tape and reel packaging format when ordering. Confirm that the application circuitry supports the 1.8V minimum operating voltage if utilizing the full digital specification range. Ensure the I2C bus pull-up resistors are compatible with the device's open-drain outputs at the target clock frequency.

Selection Notes

Select this component for designs requiring a compact SC70-6 footprint and I2C connectivity. Note that the MCP40D17 is configured specifically as a rheostat; use the MCP40D18 variant if a potentiometer configuration is required. Consider the volatile memory type, as wiper settings will be lost upon power cycling unless managed by the host system.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The 'D' designation indicates support for the I2C command code protocol, distinguishing it from the simplified command format found in the MCP401x series. It shares the same physical package and core resistor network architecture as its siblings but differs in addressability and control logic.

Replacement Considerations

MCP4017T-103E/LTY: Offers parameter equivalence but utilizes a simplified I2C command format.