MCP40D18T-503E/LTY

Overview

The MCP40D18T-503E/LTY is a single-channel, 7-bit volatile digital potentiometer manufactured by Microchip Technology. It features an I2C serial interface with command code support and operates within a supply voltage range of 1.8V to 5.5V. The device offers a total resistance (R_AB) of 50 kΩ with 128 tap positions and utilizes RAM for wiper storage. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of 260 kHz at the specified resistance, and operation across an extended temperature range from -40°C to +125°C. It is housed in a compact SC-70-6 surface-mount package.

Feature Summary

• 7-bit resolution providing 128 discrete tap positions for precise resistance adjustment
• I2C protocol support including SMBus 2.0 Write Byte/Word and Read Byte/Word formats
• Volatile RAM memory retains wiper settings only during power; defaults to mid-scale upon power-up
• SC-70-6 package with low static current consumption of 2.5 µA typical

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

Procurement Notes

Verify the specific suffix 'LTY' against the manufacturer's official documentation to confirm packaging details such as reel quantity and tape specifications. Ensure the ordering code matches the required resistance value and package type before procurement.

Selection Notes

Select this component when a potentiometer configuration with I2C control is required. Note that the MCP40D18 uses volatile memory; designs requiring non-volatile retention must use alternative models like the MCP402x series. Confirm that the system voltage supports the 1.8V minimum operating requirement for full specification compliance.

Part Context

This part belongs to the MCP40D17/18/19 family of 7-bit digital potentiometers. The MCP40D18 variant is specifically configured for potentiometer operation, distinguishing it from the rheostat-configured MCP40D17 and MCP40D19 devices within the same datasheet.

Replacement Considerations

The MCP4018T-503E/LTY is a parameter-equivalent substitute within the same family, offering identical electrical specifications and pinout compatibility.