MCP40D18T-502AE/LTY

Overview

The MCP40D18T-502AE/LTY is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 7-bit resistor network providing 128 tap positions and operates in a potentiometer configuration. The device utilizes an I2C serial interface with command code support and SMBus 2.0 compatibility. Nominal resistance (R_AB) is 5 kΩ with a typical wiper resistance of 100 Ω. It supports a supply voltage range of 1.8 V to 5.5 V, drawing 45 µA during active operation and 2.5 µA in standby. The unit includes volatile RAM memory, power-on reset protection, and functions within an extended temperature range of -40°C to +125°C.

Feature Summary

• 7-bit resolution with 128 discrete tap steps for precise resistance adjustment
• I2C protocol interface supporting SMBus 2.0 Write Byte/Word and Read Byte/Word formats
• Potentiometer configuration with zero-scale to full-scale wiper operation
• Low-power operation with 2.5 µA typical static current consumption

Applications

• PC Servers utilizing I2C Protocol with Command Code
• Amplifier Gain Control and Offset Adjustment
• Sensor Calibration including Pressure, Temperature, Position, Optical, and Chemical sensors
• Set Point or Offset Trimming
• RF Amplifier Biasing

Procurement Notes

Verify the specific ordering suffix 'E' against the manufacturer's official documentation to confirm compliance status and material specifications. Confirm that the SC70-6 package dimensions align with the target PCB footprint requirements. Ensure the I2C bus voltage levels are compatible with the host controller logic family.

Selection Notes

Select this component when a single-channel potentiometer configuration is required rather than a rheostat setup. The 5 kΩ resistance value suits applications requiring moderate current handling. Verify that volatile memory behavior is acceptable for the system design, as settings are lost upon power loss. Ensure the I2C address '0111110' does not conflict with other devices on the bus.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 variant is specifically designated for potentiometer configurations, whereas the MCP40D17 and MCP40D19 variants are configured as rheostats. All members share similar electrical characteristics and package options but differ in terminal connectivity and internal wiring.

Replacement Considerations

MCP4018T-502E/LTY: Parameter equivalent from the same manufacturer family.