LM4949TL/NOPB

Audio Amplifiers Overview

The LM4949TL/NOPB is a stereo Class D audio subsystem manufactured by National Semiconductor, now part of Texas Instruments. It integrates a high-efficiency Class D power amplifier with an OCL headphone amplifier and volume control circuitry in a single package. Designed for portable applications, it operates within a temperature range of -40°C to 85°C. The device utilizes a 25-µSMD (2.7x2.7 mm) package, providing a compact solution for stereo audio output with integrated headphone driving capabilities.

Audio Amplifiers Feature Summary

• Integrates stereo Class D power amplification with OCL headphone driver functionality
• Includes built-in volume control circuitry for system integration
• Optimized for low-power portable audio applications

Audio Amplifiers Applications

• Portable media players
• Mobile phones
• MP3 players

Audio Amplifiers Procurement Notes

Verify the component status as obsolete through official Texas Instruments channels before procurement planning. Confirm that the LM4949TL/NOPB designation corresponds to the lead-free RoHS-compliant version. Ensure compatibility with existing PCB footprints for the 25-µSMD package. Review current lifecycle notices for potential supply chain constraints or end-of-life management requirements.

Audio Amplifiers Selection Notes

Select this component for designs requiring a compact stereo audio solution with integrated headphone output. Consider the thermal performance and efficiency characteristics of the Class D architecture for battery-powered devices. Evaluate the need for external components versus the integrated features provided. Verify that the operating voltage and signal requirements align with the system specifications.

Audio Amplifiers Part Context

This part belongs to the LM4949 family of stereo Class D audio subsystems from National Semiconductor. It represents a specialized solution for integrating power amplification and headphone drivers in space-constrained mobile electronics. The NOPB suffix indicates a lead-free and RoHS-compliant manufacturing variant.

Audio Amplifiers Replacement Considerations

As the LM4949TL/NOPB is listed as obsolete, consult Texas Instruments documentation for officially confirmed substitute part numbers. Do not assume functional equivalence with other Class D amplifiers without verifying pinout and electrical specifications.