MCP40D17T-104E/LT

Overview

The MCP40D17T-104E/LT is a single-channel digital potentiometer manufactured by Microchip Technology. It features a 100 kΩ end-to-end resistance (R_AB) with 128 discrete taps, providing 7-bit resolution. The device operates on an I²C serial interface and utilizes volatile RAM to store the wiper position. It supports both rheostat and potentiometer configurations within a compact SC-70-6 surface-mount package. Electrical specifications include a supply voltage range of 1.8V to 5.5V, a typical static current of 2.5 µA, and an operating temperature range from -40°C to +125°C.

Feature Summary

• I²C Serial Interface: Supports SMBus 2.0 Write Byte/Word and Read Byte/Word protocol formats.
• High Resolution: 7-bit resistor network offering 127 resistors and 128 steps for precise adjustment.
• Low Power Consumption: Typical static current of 2.5 µA when the serial interface is inactive.
• Wide Operating Voltage: Functional operation supported from 1.8V to 5.5V.

Applications

• Amplifier gain control and offset adjustment
• Sensor calibration including 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 component authenticity through authorized distribution channels. Confirm that the specific ordering suffix matches the required package type and resistance value. Check for RoHS compliance status and ensure the device meets the extended temperature requirements if operating outside standard industrial ranges.

Selection Notes

Select this model for designs requiring a single-channel digital potentiometer controlled via I²C. Ensure the system voltage falls within the 1.8V to 5.5V operational range. Consider the volatile memory characteristic, as the wiper setting resets to mid-scale upon power loss. Verify that the SC-70-6 package dimensions fit the available PCB space.

Part Context

This component belongs to the MCP40D17/18/19 family of digital potentiometers. The MCP40D17 variant specifically offers a rheostat configuration in a 6-pin SC-70 package. It shares core architectural features with the MCP40D18 and MCP40D19 but differs in terminal availability and pinout configuration.

Replacement Considerations

MCP4017T-104E/LT

FAQ

What is the default wiper setting after power-up?

The device initializes to a mid-scale wiper setting (3Fh hex) upon power-on or brown-out reset.

Does the MCP40D17 retain its setting without power?

No, the device uses volatile RAM. The wiper position is lost when power is removed and resets to mid-scale upon re-powering.

What is the maximum I²C clock frequency supported?

The device supports Standard Mode up to 100 kHz and Fast Mode up to 400 kHz.