MCP40D17T-104E/LTY

Overview

The MCP40D17T-104E/LTY is a single-channel digital potentiometer IC 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 utilizes an I²C serial interface for control and employs volatile RAM to store the wiper position. It operates within a supply voltage range of 1.8 V to 5.5 V and supports both rheostat and potentiometer configurations. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of 100 kHz at full scale, and operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• I²C Interface: Supports SMBus 2.0 Write Byte/Word and Read Byte/Word protocol formats with standard address '0101110'.
• High Bandwidth: Provides a -3 dB bandwidth of 100 kHz for the 100 kΩ device configuration.
• Low Power Consumption: Draws a typical static current of 2.5 µA when the serial interface is inactive.
• Compact Packaging: Available in a small SC70-6 surface-mount package.

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 cost-sensitive mechanical trim potentiometers.
• RF amplifier biasing networks.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and package type. The 'LTY' suffix indicates the SC70-6 package variant. Ensure that system designs account for the volatile nature of the memory, as power loss will reset the wiper position to mid-scale.

Selection Notes

Select this component when a low-profile, I²C-controlled variable resistor is required for applications needing 100 kΩ maximum resistance. The 7-bit resolution offers 128 steps, which may be sufficient for coarse adjustments but consider higher-resolution devices if finer control is necessary. Confirm that the 1.8 V minimum operating voltage aligns with the system's logic levels.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D17 specifically denotes the rheostat configuration variant within this series. It shares core specifications with the MCP40D18 (potentiometer) and MCP40D19 (rheostat, SC70-5 package), differing primarily in terminal configuration and package options.

Replacement Considerations

The MCP4017T-104E/LT is a parameter-equivalent alternative within the same family. Verify that the legacy MCP4017 series meets all functional requirements before substitution, noting potential differences in command code formats or availability status.