STMicroelectronics TDA7388A

Overview

TDA7388A from STMicroelectronics is a quad-channel Class AB audio power amplifier in Flexiwatt27 package, delivering 4 × 42 W into 4 Ω loads at 14.4 V supply, with fixed 26 dB gain, clipping/offset detection, and integrated diagnostics for automotive radio systems.

For engineers reviewing the TDA7388A datasheet, TDA7388A pinout, TDA7388A application, or TDA7388A equivalent, this device is selected for high-fidelity car audio amplification where rail-to-rail output swing, low external component count, thermal/short-circuit protection, and automute functionality are critical design requirements.

Technical Context

The TDA7388A employs a fully complementary PNP/NPN output stage enabling rail-to-rail voltage swing without bootstrap capacitors. It integrates diagnostic circuitry for out-to-GND/VS shorts, thermal shutdown, and DC offset detection - all operating under automotive-grade temperature range (–40 °C to +105 °C) and supply voltage up to 28 V DC.

Its internal fixed gain (26 dB ±1 dB), "A"-weighted output noise of 50–70 µV, THD of 0.04 % typical at 4 W, and SVR of 50–65 dB at 100 Hz support clean, stable audio reproduction in noisy vehicle electrical environments with minimal external filtering.

Key Specifications

Pinout & Package

Package: Flexiwatt27 (vertical, 27-pin, thermally enhanced through-hole package with exposed metal tab for heatsink mounting; R_{th j-case} = 1 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.

Compared with TDA7388 and TDA7851, the TDA7388A delivers optimal balance of proven reliability, minimal external components, and automotive-specific protections - making it ideal for cost-sensitive yet robust head unit amplifiers where fixed-gain simplicity and diagnostic transparency are prioritized.

Availability

TDA7388A is available at Aetrix Electronics and suitable for automotive head units, aftermarket stereo modules, multi-zone in-cabin audio systems, and commercial vehicle infotainment platforms requiring stable component supply across extended production lifecycles.

Supply support for TDA7388A 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, designing and manufacturing analog, MCU, power, and automotive ICs for industrial, consumer, and automotive markets.

The TDA7388A belongs to ST's automotive audio power amplifier product line, engineered specifically for high-efficiency, high-reliability Class AB amplification in space-constrained car radio applications with stringent EMC and thermal requirements.

FAQ

What is the maximum continuous output power per channel into 4 Ω?

The TDA7388A delivers 4 × 42 W maximum continuous output power into 4 Ω loads at VS = 14.4 V, 1 kHz, and THD = 10 %. At 14.4 V and 10 % THD, typical output is 27 W per channel - verified per Table 4, Po specification, under standard test conditions with RL = 4 Ω and Tamb = 25 °C.

Does the TDA7388A require external bootstrap capacitors?

No. The TDA7388A uses a fully complementary PNP/NPN output stage that enables rail-to-rail output voltage swing without external bootstrap capacitors - explicitly stated in the Description section and confirmed by the absence of bootstrap capacitor requirements in Figure 2 (standard application circuit) and Section 3.2 (Input stage).

How does the automute function respond to low supply voltage?

The automute function activates when supply voltage falls below the V_{AM in} threshold of 6.5–8.5 V (typ. 7.6 V), attenuating output by ≥80 dB. This prevents audible pops during engine cranking and ensures silent operation until stable battery voltage is restored - specified in Table 4 under "VAM in" parameter and detailed in Section 3.3.

What thermal protection mechanism does the TDA7388A use?

The TDA7388A implements a soft thermal limiter that gradually reduces output power above safe junction temperature (T_j = 150 °C), rather than abrupt shutdown. This preserves audio continuity during transient thermal overload and avoids disruptive restart cycles - confirmed in the Description and Table 2 (T_j rating) and supported by thermal data showing R_{th j-case} = 1 °C/W.