LM4864N

Audio Amplifiers Overview

The LM4864N is a mono audio power amplifier manufactured by National Semiconductor, designed for portable applications. It operates from a single supply voltage ranging from 2.7V to 5.5V. The device delivers 1W of continuous average power into an 8Ω load with a 5V supply and less than 1% THD+N. It features integrated output capacitors, eliminating the need for external coupling components in many configurations. The amplifier includes thermal shutdown and short-circuit protection circuits to ensure robust operation under fault conditions.

Audio Amplifiers Feature Summary

• Integrated Class AB audio amplifier architecture optimized for low-power portable devices
• Built-in output capacitor configuration reduces external component count and board space
• Comprehensive protection mechanisms including thermal shutdown and short-circuit current limiting

Audio Amplifiers Applications

• Portable media players and MP3 players
• Mobile phones and handheld communication devices
• Personal digital assistants (PDAs) and similar battery-operated electronics

Audio Amplifiers Procurement Notes

Verify the specific suffix and package type against official datasheets before procurement. Ensure compatibility with your system's voltage rails and thermal requirements. Confirm that the manufacturer or authorized distributor provides genuine components with traceable documentation. Check for any updated revisions that may affect pinout or electrical characteristics.

Audio Amplifiers Selection Notes

Select this component when a compact, single-supply audio solution is required for low-voltage systems. Consider its efficiency and output power relative to your speaker impedance and battery life constraints. Evaluate the thermal performance if operating near maximum ratings. Compare alternative amplifiers based on available decoupling options and total harmonic distortion specifications.

Audio Amplifiers Part Context

National Semiconductor, now part of Texas Instruments, produced the LM4864 series as part of their portfolio of audio solutions for consumer electronics. This model represents a specific iteration within the broader family of mono amplifiers designed for mobile platforms. The N suffix typically denotes a plastic DIP package variant, distinguishing it from surface-mount options like the NS or W packages.

Audio Amplifiers Replacement Considerations

Consult official substitution guides for direct equivalents such as other LM4864 variants with different packaging. Verify pin-to-pin compatibility and electrical parameter alignment before replacing. Cross-reference with Texas Instruments' recommended alternatives if National Semiconductor legacy parts are discontinued.