LM4731TA/NOPB

Audio Amplifiers Overview

The LM4731TA/NOPB is a stereo audio power amplifier delivering 25W per channel into 4Ω or 8Ω loads with less than 10% THD+N. It operates on dual supplies ranging from ±10V to ±28V, supporting total supply voltages between 20V and 56V. The device features independent mute and standby modes for power conservation and transient control. Key electrical parameters include an 85dB typical mute attenuation, 0.02% typical THD+N at 1kHz, and a 18V/μs slew rate. Thermal protection activates above 150°C.

Audio Amplifiers Feature Summary

• Independent smooth transition fade-in/out mute mode for each channel
• Power conserving standby mode controllable by external logic
• Integrated short circuit protection and thermal shutdown at 150°C
• Under voltage lock out feature prevents click and pop transients

Audio Amplifiers Applications

• Audio amplifiers for high-end stereo TVs
• Audio amplifiers for component stereo systems
• Audio amplifiers for compact stereo setups
• Audio amplifiers for PC satellite speaker systems
• Audio amplifiers for self-powered speakers

Audio Amplifiers Procurement Notes

Verify the obsolete status of this component before procurement planning. Confirm that the TA15A package tab connects to V-potential if direct heat sink mounting is used without isolation washers. Ensure design accounts for the specific thermal resistance requirements of the TO-220 package to prevent thermal shutdown during operation.

Audio Amplifiers Selection Notes

Select this amplifier for applications requiring high output power in a split-supply configuration. Consider the need for level shifters if using single-supply logic controls for mute or standby functions. Evaluate thermal management capabilities carefully, as the device dissipates significant power. Verify that the load impedance matches the 4Ω or 8Ω specifications for optimal performance and distortion levels.

Audio Amplifiers Part Context

This part belongs to the LM4731 series of stereo audio power amplifiers manufactured by Texas Instruments. It is designed for high-fidelity audio reproduction with minimal external components. The TA suffix indicates the TO-220 physical package, which requires appropriate heat sinking for sustained high-power operation.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.