MCP4018T-103E/LT

Overview

The MCP4018T-103E/LT is a single-channel, 7-bit volatile digital potentiometer manufactured by Microchip Technology. It features an I2C serial interface and offers 128 wiper tap positions with a nominal resistance of 50 kΩ (indicated by the '503' suffix). The device operates within a supply voltage range of 1.8V to 5.5V and supports standard and fast-mode I2C communication up to 400 kHz. Packaged in a compact SC70-6 surface-mount format, it includes power-on reset protection that defaults the wiper to mid-scale upon initialization.

Feature Summary

• 7-bit resolution providing 128 discrete wiper steps for precise resistance adjustment
• I2C serial interface supporting Standard Mode (100 kHz) and Fast Mode (400 kHz)
• Configurable as either a potentiometer or rheostat with zero-scale to full-scale wiper operation
• Low static current consumption of approximately 2.5 µA when the interface is inactive

Applications

• Audio volume control circuits requiring digital adjustment
• Variable gain amplifier settings in signal processing systems
• Voltage reference trimming and calibration
• Programmable biasing networks in sensor interfaces

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature rating. Ensure the design accounts for the volatile nature of the memory, as wiper settings are lost during power cycles unless re-initialized via the I2C bus.

Selection Notes

Select this component when a single-channel digital potentiometer with I2C control is required. The 50 kΩ resistance value suits moderate impedance applications. For designs needing non-volatile storage of the wiper position across power cycles, consider alternative models from the same family equipped with EEPROM instead of RAM.

Part Context

This part belongs to the MCP4017/18/19 family of 7-bit digital potentiometers. The MCP4018 variant specifically utilizes a 6-pin SC70 package configured for potentiometer operation, distinguishing it from the rheostat-oriented MCP4017 and MCP4019 variants which share similar electrical characteristics but differ in pinout configuration.

Replacement Considerations

Direct functional replacements include other MCP4018 series devices with different resistance values, such as MCP4018T-103E/LT (10 kΩ) or MCP4018T-104E/LT (100 kΩ), provided the pinout remains compatible.