STMicroelectronics TDA7396

Overview

TDA7396 from STMicroelectronics is a Class AB bridge-tied load (BTL) audio power amplifier designed for automotive radio applications, delivering 45W into 2Ω at 14.4V with 10% THD, featuring differential/single-ended input support, internally fixed 26dB gain, and integrated diagnostic functions including clipping detection, open-load, short-circuit, and thermal shutdown.

For engineers reviewing the TDA7396 datasheet, TDA7396 pinout, TDA7396 application, or TDA7396 equivalent, key selection considerations include its 2Ω load capability, CMOS-compatible standby control, automatic mute during power transitions, no-bootstrap operation, and diagnostics output via open-collector CD-DIA pin for assembly verification and fault logging in car audio systems.

Technical Context

The TDA7396 implements a fully complementary PNP/NPN BTL output stage enabling rail-to-rail swing without bootstrap capacitors, supporting both differential and single-ended inputs with matched 60kΩ differential/55kΩ single-ended input impedance and 70dB CMRR at 1kHz. Its internal bias architecture eliminates external SVR and Boucherot components while maintaining stable quiescent current (100mA typ) across 8–18V supply range.

Diagnostic functionality integrates three independent detection paths: clipping at 0.5% THD threshold, output fault conditions (short-to-GND/Vs/across-load, open-load pre-power-on), and two-stage thermal protection-linear foldback activation at 140°C and absolute shutdown at 160°C-with diagnostics signaled via open-drain CD-DIA pin sinking current during all active fault or clipping events.

Key Specifications

Pinout & Package

Package: Multiwatt11 (vertical, 11-pin, thermally enhanced with metal tab connected to Pin 6). Tab electrically tied to OUT+; requires isolated heatsink mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BTL automotive audio amplifier applications.

Compared with TDA7396, TDA7388 omits diagnostics and sync but reduces BOM cost, while STA559BW replaces analog signal path with I²S and embedded DSP-making it incompatible for analog-input legacy upgrades but superior for new digital audio platforms.

Availability

TDA7396 is available at Aetrix Electronics and suitable for automotive head unit design, aftermarket audio booster modules, and multi-zone vehicle infotainment systems requiring stable component supply, long-lifecycle support, and production-ready diagnostics integration.

Supply support for TDA7396 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing scale and AEC-Q100 qualified product lines.

The TDA7396 belongs to ST's automotive audio power amplifier family, engineered specifically for high-reliability car radio applications demanding robust fault protection, thermal resilience, and simplified system integration in space-constrained head units.

FAQ

What is the purpose of the CD-DIA pin?

The CD-DIA pin is an open-collector diagnostic output that sinks current during clipping (at 0.5% THD), thermal foldback (140°C), absolute thermal shutdown (160°C), short-circuit (to GND, Vs, or across load), or open-load detection. It remains low until fault removal, enabling microcontroller-based fault logging and assembly verification without additional sensors.

Can the TDA7396 operate with a single-ended input?

Yes - the input stage accepts both differential and single-ended signals. For single-ended use, IN− is AC-coupled to signal ground via a 0.22µF capacitor, while IN+ receives the signal. Input impedances must be matched (e.g., 55kΩ each) to preserve common-mode rejection and minimize distortion.

How does the SYNC pin function in multi-amplifier systems?

The SYNC pin connects to a resistor (RS) to ground to program a current charging the CM capacitor (Pin 11), controlling the time constant for amplifier startup. When multiple TDA7396s share identical RS and CM values, their internal bias ramps synchronize, ensuring simultaneous turn-on and eliminating sequential channel activation noise in multi-zone audio systems.

Is heatsinking required, and how is thermal performance specified?

Yes - the Multiwatt11 package requires mechanical attachment of the metal tab (Pin 6, connected to OUT+) to an isolated heatsink. ST specifies R_{th j-case} = 1.5°C/W maximum; with proper heatsinking, the device sustains 43W power dissipation at 85°C case temperature, enabling full 45W output into 2Ω under typical automotive ambient conditions.