MCP40D19T-503E/LT

Overview

The MCP40D19T-503E/LT is a single-channel, 7-bit digital potentiometer manufactured by Microchip Technology. It features an I2C serial interface with command code support and volatile RAM memory for wiper settings. The device offers a resistance range of 5 kΩ to 100 kΩ, with the -503 suffix indicating a nominal 50 kΩ value. It operates within a supply voltage range of 1.8V to 5.5V and supports I2C clock frequencies up to 400 kHz. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of approximately 260 kHz at 50 kΩ, and operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• 7-bit resolution providing 128 discrete tap positions via I2C interface
• Configurable as a rheostat or potentiometer with standard I2C address 0101110
• Low power consumption with typical static current of 2.5 µA
• Brown-out reset protection and mid-scale power-on default setting

Applications

• Amplifier gain control and offset adjustment
• Sensor calibration for pressure, temperature, and optical sensors
• Set point or offset trimming in electronic circuits
• RF amplifier biasing applications
• LCD brightness and contrast adjustment

Procurement Notes

Verify the specific resistance tolerance and temperature coefficient requirements against the datasheet specifications for the 50 kΩ variant. Confirm that the system design accommodates the volatile nature of the internal RAM, ensuring wiper position is re-initialized upon power-up if state retention is required.

Selection Notes

Select this component when a compact SC70-5 package is required for space-constrained designs. Choose this model over non-volatile alternatives if power consumption must be minimized during standby, noting that the wiper setting resets to mid-scale (3Fh) after power cycling.

Part Context

This part belongs to the MCP40D1x family of digital potentiometers, which are distinguished by their support for the I2C protocol with command codes. Unlike the MCP401x series, these devices utilize a simplified command structure optimized for specific I2C throughput requirements while maintaining compatibility with standard SMBus protocols.

Replacement Considerations

The MCP4019T-503E/LT serves as a functional equivalent within the same package and interface family, though it utilizes a simplified I2C command format.