TDA7264A

Overview

The TDA7264A is a Class AB dual audio power amplifier from STMicroelectronics, housed in a Multiwatt-8 package. It delivers 25 W per channel into an 8 Ω load at THD=10% with a ±20 V split supply. The device features a fixed internal voltage gain of 30 dB and operates on a wide supply voltage range up to ±25 V absolute maximum. Key electrical parameters include a quiescent current of 80 mA typical, input offset voltage of ±20 mV, and a thermal shutdown threshold at 145 °C.

Feature Summary

• Integrated mute and stand-by functions for pop-free operation and low quiescent current consumption
• Built-in thermal overload protection and short-circuit protection for output stages
• Designed for high-quality sound applications such as Hi-Fi music centers and stereo TV sets

Applications

• Hi-Fi music centers
• Stereo TV sets
• High-quality sound systems

Procurement Notes

Verify the specific suffix 'A' against the manufacturer's official documentation to confirm pinout compatibility and functional equivalence. Confirm that the Multiwatt-8 package dimensions match the target PCB footprint. Ensure the design accounts for the required heat sinking given the 30 W power dissipation rating at 70 °C case temperature.

Selection Notes

Select this component for designs requiring a fixed 30 dB gain without external feedback resistors for gain setting. It is suitable for split supply architectures operating between ±5 V and ±25 V. Consider the Multiwatt-8 through-hole package for ease of assembly and thermal management compared to surface-mount alternatives.

Part Context

The TDA7264A belongs to the TDA726x series of Class AB audio amplifiers by STMicroelectronics. While sharing similar protective features like mute and thermal shutdown, it differs from the TDA7265 (Multiwatt-11) and TDA7266 (PowerSO-20) primarily in its 8-pin Multiwatt package and specific pin configuration. This variant is optimized for compact stereo applications.

Replacement Considerations

TDA7265: Requires Multiwatt-11 package adaptation; verify pin mapping differences.

FAQ

Is the voltage gain adjustable?

No, the voltage gain is internally fixed at 30 dB and cannot be changed.

What is the thermal shutdown threshold?

The junction temperature thermal shutdown occurs at 145 °C.