MCP4019T-104E/LT

Overview

The MCP4019T-104E/LT is a single-channel digital potentiometer manufactured by Microchip Technology, housed in a compact SC-70-5 surface-mount package. It features a nominal resistance (R_AB) of 100 kΩ with a ±20% tolerance and utilizes volatile RAM for wiper position storage. The device offers 7-bit resolution, providing 128 discrete tap positions for precise adjustment. Control is managed via a standard I²C serial interface supporting both Standard Mode (up to 100 kHz) and Fast Mode (up to 400 kHz). It operates within a supply voltage range of 1.8V to 5.5V and supports an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Seven-bit resolution with 128 taps and 100 kΩ nominal resistance
• I²C serial interface compatible with SMBus protocols
• Low power consumption with typical static current of 2.5 µA
• Brown-out reset protection and mid-scale power-on default

Applications

• Programmable gain amplifiers
• Voltage reference trimming
• Audio volume control circuits
• Sensor bias adjustment

Procurement Notes

Verify the specific suffix 'LT' corresponds to the SC-70-5 package and lead-free status as defined in the datasheet. Confirm that the 'E' designation indicates compliance with RoHS standards. Ensure the ordering quantity matches the manufacturer's standard packaging requirements for the tape and reel configuration.

Selection Notes

Select this component when a rheostat configuration is required rather than a potentiometer setup. The MCP4019 differs from the MCP4018 by having only five pins, omitting the terminal A connection which is internally grounded. Verify that the system requires volatile memory, as settings are lost upon power cycling.

Part Context

This part belongs to the MCP4017/18/19 family of 7-bit digital potentiometers. While the MCP4017 and MCP4018 utilize a six-pin SC-70 package, the MCP4019 specifically uses a five-pin SC-70-5 footprint. All three variants share identical electrical characteristics and I²C control logic but differ in pinout availability for terminals A and B.

Replacement Considerations

MCP40D19T-104E/LT

FAQ

What is the default wiper position after power-up?

The device initializes to a mid-scale setting (3Fh hex) upon power-up or brown-out reset.

Does the MCP4019 retain its setting without power?

No, it uses volatile RAM, meaning the wiper position resets to mid-scale every time power is removed.

What is the maximum I²C clock frequency supported?

The device supports Fast Mode operation with a maximum SCL frequency of 400 kHz.