The MCP121T-270E/TT is a 10-bit I2C Digital Potentiometer manufactured by Microchip. It is a low-cost, 256 position, single-channel, digitally controlled potentiometer. Its operating voltage range is 2.7V to 5.5V, and its external reset pin can be used to reset the device to its initial value. The MCP121T-270E/TT is designed for a wide range of analog and digital applications, such as linearization, mixed signal calibrations, gain setting, negative temperature coefficient (NTC) thermistors, and LED current control.