MCP4018T-502E/LTY

Overview

The MCP4018T-502E/LTY is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 7-bit resolution providing 128 tap positions and utilizes volatile RAM for wiper storage. The device operates via an I²C serial interface with support for SMBus protocols. Key electrical parameters include a nominal resistance (R_AB) of 5 kΩ, a typical wiper resistance of 100 Ω, and a supply voltage range of 1.8 V to 5.5 V. It offers low static current consumption of 2.5 µA and supports extended industrial temperature ranges from -40°C to +125°C.

Feature Summary

• 7-bit resolution with 128 discrete tap steps for precise resistance adjustment
• I²C serial control interface compatible with standard and fast-mode (400 kHz) operations
• Volatile memory retains settings only during power; resets to mid-scale upon power-up
• Low power operation with 2.5 µA typical standby current

Applications

• Volume control in audio signal paths
• Programmable gain amplifier biasing
• Voltage reference trimming
• Sensor calibration circuits

Procurement Notes

Verify the specific suffix 'LTY' against official Microchip documentation to confirm tape-and-reel packaging and lead-free status. Ensure the I²C address configuration matches system requirements, as the device uses fixed addressing. Confirm that volatile memory behavior aligns with application needs regarding power loss data retention.

Selection Notes

Select this component when a single-potentiometer configuration with I²C control is required. The 5 kΩ resistance value suits moderate impedance applications. Consider the MCP4017 or MCP4019 if rheostat configurations are needed instead of potentiometer setups. Verify that the 1.8 V minimum operating voltage meets the lowest system supply rail.

Part Context

This part belongs to the MCP4017/18/19 family of 7-bit digital potentiometers. The MCP4018 variant specifically provides a potentiometer configuration, distinguishing it from the rheostat-only MCP4017 and MCP4019 models. All variants share similar electrical characteristics and package options within the SC70 form factor.

Replacement Considerations

Direct functional equivalents within the same family include MCP4017T-502E/LTY and MCP4019T-502E/LTY, though these offer different terminal configurations (rheostat vs. potentiometer). Cross-family replacements like the MCP4532 require SPI interface adaptation.