TDA8945S/N1,112

Overview

The TDA8945S/N1,112 is a single-channel audio power amplifier delivering 15 W into an 8 Ω load at 18 V supply. It utilizes a Bridge Tied Load (BTL) architecture with an all-NPN output stage capable of 2 A peak current. The device features fixed gain, standby/mute logic, and comprehensive protection against short circuits and thermal overload. Packaged in a 9-lead SIL format, it ensures low quiescent current and high ripple rejection for efficient mains-fed and portable audio designs.

Feature Summary

• Bridge Tied Load configuration with all-NPN output stage
• Integrated standby and mute modes to prevent switching plops
• Short-circuit and thermal shutdown protection mechanisms
• High supply voltage ripple rejection capability

Applications

• Mains fed applications such as TV sound systems
• Personal computer audio subsystems
• Portable audio equipment requiring efficient power usage

Procurement Notes

Verify the specific ordering suffix N1,112 against the manufacturer's current production status. Confirm that the SIL9P package variant matches the required PCB footprint and thermal management strategy for the target application environment.

Selection Notes

Select this component for mono BTL applications requiring fixed gain amplification. Ensure the design accommodates the 9-lead SIL package thermal resistance and provides adequate heatsinking to maintain junction temperature within limits during worst-case sine-wave dissipation scenarios.

Part Context

This part belongs to the TDA894x family, which shares printed-circuit board compatibility. A single PCB footprint can accommodate both mono and stereo products within this series, simplifying layout strategies for manufacturers designing multiple audio configurations.

Replacement Considerations

Consult official documentation for confirmed substitute part numbers within the TDA894x family. Verify pinout and thermal characteristics before integrating any alternative devices to ensure system compatibility.

FAQ

How does the MODE pin control the operational states?

The MODE pin selects between standby, mute, and operating modes via DC voltage levels. Standby occurs when VMODE is near VCC, mute when VMODE is between 3 V and VCC minus 1.5 V, and operating when VMODE is below 0.5 V.

What protection mechanisms are included?

The device includes short-circuit protection to ground, supply, and across the load, as well as thermal shutdown protection that activates at approximately 150 °C junction temperature.