MCP4019T-103E/LT

Overview

The MCP4019T-103E/LT is a single-channel digital potentiometer IC manufactured by Microchip Technology. It features a 10 kΩ total resistance (R_AB) with 7-bit resolution, providing 128 discrete tap positions for precise adjustment. The device utilizes an I²C serial interface for control and incorporates volatile RAM to store the wiper setting. It operates within a supply voltage range of 1.8 V to 5.5 V and supports both rheostat and potentiometer configurations. Key electrical characteristics include a typical wiper resistance of 100 Ω and a power-on default wiper setting at mid-scale.

Feature Summary

• 7-bit resolution with 128 taps and 10 kΩ nominal resistance
• I²C serial interface supporting standard and fast modes
• Volatile memory retains wiper position during operation
• Power-on reset sets wiper to mid-scale (3Fh)
• Brown-out reset protection with 1.5 V typical threshold

Applications

• Audio volume control circuits
• Programmable gain amplifier biasing
• Voltage reference trimming
• Sensor calibration adjustments

Procurement Notes

Verify the specific suffix 'LT' corresponds to the SC-70-5 package and tape-and-reel shipping configuration as defined in the official datasheet. Confirm that the application design accounts for the volatile nature of the internal RAM, ensuring that power loss results in the loss of the last stored wiper position until the next power cycle resets it to mid-scale.

Selection Notes

Select this component when a compact surface-mount solution is required for low-pin-count applications. The SC-70-5 package minimizes board space compared to larger packages. Ensure the system design accommodates the 1.8 V minimum operating voltage if used in low-power portable devices, while noting that analog performance specifications are guaranteed from 2.7 V upwards.

Part Context

This part belongs to the MCP4017/18/19 family of 7-bit digital potentiometers. The MCP4019 variant is distinct within the family due to its 5-pin SC-70 package and rheostat-only configuration, whereas the MCP4017 and MCP4018 utilize 6-pin packages and support potentiometer modes. All variants share identical electrical characteristics and I²C control logic.

Replacement Considerations

The MCP40D19T-103E/LT serves as a direct functional replacement, offering identical pinout and specifications. Other family members like the MCP4017T or MCP4018T require package adaptation due to different pin counts.