TDA7382

Overview

The TDA7382 is a Class AB audio power amplifier designed for high-end car radio applications. It features four bridge channels in a Flexiwatt 25 package, delivering up to 4 x 30W max at 4Ω (EIAJ) and 4 x 22W at 14.4V, 1kHz, 10% THD. Operating on an 18V supply with a 28V DC limit, it utilizes a fully complementary PNP/NPN output configuration for rail-to-rail swing without bootstrap capacitors. The device includes internal fixed gain of 26dB, clipping detection, standby, mute functions, and comprehensive protections against shorts, thermal overload, and reversed battery.

Feature Summary

• Four-channel bridge architecture with fully complementary PNP/NPN output stage enabling rail-to-rail voltage swing without external bootstrap capacitors.
• Integrated clipping detector outputs pulses synchronized with distortion events exceeding typical THD levels to facilitate gain compression control.
• CMOS-compatible standby and mute facilities with automute functionality triggered by minimum supply voltage detection.
• Comprehensive protection suite including output short circuits to ground or supply, thermal limiting, load dump tolerance, and reversed battery safety.

Applications

• High-end car radio systems
• Automotive audio amplifiers
• Multi-channel speaker driving

Procurement Notes

Verify component authenticity as the TDA7382 is listed as obsolete. Confirm package integrity and pin alignment for the Flexiwatt 25 form factor. Ensure replacement components maintain identical electrical characteristics and protection logic. Validate that substitute parts support the required automotive operating temperatures and supply voltage ranges. Check for updated datasheet revisions if sourcing from secondary markets.

Selection Notes

Select this component for designs requiring high output power in a compact footprint without bootstrap circuitry. The internal fixed gain simplifies board layout by eliminating external compensation networks. Consider the clipping detector feature if active gain compression is needed to protect speakers. Verify that the system can accommodate the specific threshold voltages for mute and standby control signals.

Part Context

The TDA7382 belongs to STMicroelectronics' family of Class AB automotive audio amplifiers. It shares architectural similarities with models like the TDA7388 and TDA7385 but offers distinct power ratings and feature sets tailored for specific vehicle audio configurations. It serves as a dedicated solution for driving multiple speakers in modern car radios.

Replacement Considerations

TDA7385

FAQ

How does the clipping detector function?

The clipping detector monitors output signals and generates pulses when the total harmonic distortion reaches a typical level of 10%. These pulses are synchronized with clipping events to allow microprocessors to reduce volume or bass levels.

What is the maximum supply voltage rating?

The operating supply voltage is rated at 18V, while the DC supply voltage can withstand up to 28V, and peak supply voltage up to 50V for short durations.