TDA8954J/N1,112

Overview

The TDA8954J/N1,112 is a stereo or mono high-efficiency Class D audio power amplifier manufactured by NXP Semiconductors. It delivers up to 2 × 210 W into a 4 Ω load in stereo Single-Ended applications or 1 × 420 W into an 8 Ω load in mono Bridge-Tied Load configurations. Operating over a wide supply voltage range from ±12.5 V to ±42.5 V, it features low quiescent current consumption and audiophile sound quality comparable to Class AB amplification. The device includes two diagnostic pins for monitoring Thermal Fold Back and Over Current Protection status.

Feature Summary

• High output power with approximately 93% efficiency into a 4 Ω load
• Stereo full differential inputs configurable as stereo SE or mono BTL amplifier
• Advanced protection strategy including thermal foldback, overcurrent, and window protection
• Smooth pop noise-free start-up and switch-off via mode selection input

Applications

• Digital video disc (DVD) systems
• Home Theater In A Box (HTIB) systems
• Mini and micro receivers
• High-power speaker systems
• Public Address (PA) systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and marking. Confirm availability status as distribution channels may vary. Cross-reference the datasheet revision date to ensure compatibility with design requirements. Check for any regional compliance certifications required for the target market.

Selection Notes

Select this component for designs requiring high power density and efficiency in audio amplification. Ensure the application supports the required symmetrical supply voltage range of ±12.5 V to ±42.5 V. Consider the DBS23P package for thermal management needs. Verify that the external filter components match the specified LC values for optimal performance.

Part Context

This part belongs to the TDA8954 series of Class D power amplifiers from NXP Semiconductors. It is designed to replace older Class AB solutions in high-power audio applications. The series offers flexibility in configuration, supporting both stereo and bridge-tied load modes. It is intended for use in consumer electronics requiring robust audio output capabilities.

Replacement Considerations

Consult the official NXP replacement guide for verified substitute part numbers. Ensure pin compatibility and thermal characteristics match the existing design. Verify that the replacement part meets all electrical specifications required by the application.

FAQ

How is the carrier frequency determined?

The carrier frequency is set by an external resistor connected between the OSC and OSCREF pins. A typical value of 30 kΩ sets the frequency to 335 kHz.

What is the function of the DIAG1 and DIAG2 pins?

DIAG1 provides a warning signal for Thermal Fold Back activation. DIAG2 monitors Over Current Protection status and indicates if the amplifier has been shut down by any protection circuit.