MCP40D17T-103E/LTY

Overview

The MCP40D17T-103E/LTY is a single-channel digital potentiometer featuring an I2C serial interface and volatile memory. It offers 128 wiper positions with a nominal resistance of 10 kΩ (±20% tolerance). The device operates within a supply voltage range of 1.8V to 5.5V, supporting both standard (100 kHz) and fast mode (400 kHz) I2C protocols. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of 1 MHz at the 10 kΩ setting, and low power consumption with a typical static current of 2.5 µA.

Feature Summary

• 7-bit resolution providing 128 discrete wiper steps for precise resistance adjustment.
• I2C compatible interface supporting SMBus 2.0 Read/Write Byte and Word protocols.
• Configurable as either a rheostat or potentiometer with zero-scale to full-scale wiper operation.
• Integrated Brown-out Reset protection and Power-on Reset to mid-scale wiper position.

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.
• RF amplifier biasing networks.
• LCD brightness and contrast adjustment modules.

Procurement Notes

Verify the specific suffix 'LTY' against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure the design supports volatile memory behavior, as settings are lost upon power loss. Confirm I2C address compatibility, as this device uses the standard address '0101110'.

Selection Notes

Select this component when a compact SC70-6 package is required for space-constrained designs. Choose the 10 kΩ variant if the application demands lower impedance compared to the 50 kΩ or 100 kΩ options. Verify that the system can tolerate volatile memory, as non-volatile EEPROM variants belong to different product families.

Part Context

This part belongs to the MCP40D17/18/19 family of digital potentiometers. The 'D' designation indicates support for command codes, allowing higher data throughput compared to simplified I2C interfaces found in other series like the MCP4017. It serves as a direct replacement for mechanical trim pots in cost-sensitive applications.

Replacement Considerations

The MCP4017T-103E/LTY is a parameter-equivalent alternative within the same family, differing primarily in I2C command format simplicity. Cross-reference pinouts and electrical tolerances before substitution.