TDA8954TH/N1,118

Overview

The TDA8954TH/N1,118 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 configuration or 1 × 420 W into an 8 Ω load in mono Bridge-Tied Load mode. Operating with symmetrical supply voltages from ±12.5 V to ±42.5 V, it features low quiescent current consumption and audiophile sound quality comparable to Class AB amplifiers. The device includes two diagnostic pins for monitoring Thermal Fold Back and Over Current Protection status.

Feature Summary

• High output power capability with approximately 93% efficiency
• Stereo full differential inputs supporting SE or BTL configurations
• Advanced protection strategy including thermal foldback and overcurrent limiting
• Smooth pop noise-free start-up and switch-off functionality

Applications

• Digital Video Disc (DVD) systems
• Home Theater In A Box (HTIAB) systems
• Mini and micro receiver units
• High-power speaker systems
• Public Address (PA) systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to ensure package compatibility and availability status. Confirm that the component meets all environmental and regulatory requirements for the intended deployment environment before finalizing procurement decisions.

Selection Notes

Select this amplifier for applications requiring high power density and efficient heat management. Ensure the design accommodates the required symmetrical supply voltage range and implements appropriate LC demodulation filters. Consider the diagnostic pin requirements for system monitoring and protection integration during the schematic design phase.

Part Context

This component belongs to the TDA8954 family of Class D power amplifiers from NXP Semiconductors. The TH variant utilizes a plastic heatsink small outline package (HSOP24), distinguishing it from other package options within the series. It is designed for robust performance in consumer audio electronics requiring high fidelity and reliability.

Replacement Considerations

Consult official NXP documentation for confirmed substitute part numbers. Verify functional equivalence regarding pinout, thermal characteristics, and electrical specifications before implementing any alternative components in existing designs.

FAQ

How is the carrier frequency determined?

The carrier frequency is set by an external resistor connected between the OSC and OSCREF pins, with an optimal range between 250 kHz and 450 kHz.

What is the function of the DIAG1 pin?

Pin DIAG1 provides a warning signal when Thermal Fold Back (TFB) is activated, indicating that the junction temperature has exceeded the threshold and gain is being reduced.

How does the amplifier handle short-circuit conditions?

The amplifier limits output current during short circuits. If the impedance is below a specific threshold, it may shut down completely and attempt to restart after 100 ms once the fault is cleared.