STMicroelectronics TDA7391PD13TR

Overview

TDA7391PD13TR from STMicroelectronics is a 32 W bridge-type Class AB audio power amplifier in PowerSO20 (slug-up) package, designed for high-power car radio applications. It delivers 32 W into 3.2 Ω at 14.4 V with 10% THD, features differential/single-ended inputs, fixed 30 dB gain, and integrated clipping detection (CD pin). Used in automotive head units as main output stage driving low-impedance speakers.

For engineers reviewing the TDA7391PD13TR datasheet, TDA7391PD13TR pinout, TDA7391PD13TR application, or TDA7391PD13TR equivalent, key selection criteria include thermal resistance (2 °C/W), standby current (<100 µA), mute/standby timing programmability via external RC, and short-circuit protection across load, GND, and VS.

Technical Context

The TDA7391PD13TR implements a fully complementary PNP/NPN bridge output stage enabling rail-to-rail swing without bootstrap capacitors and supports both differential and single-ended input configurations with matched impedance requirements. Its internal fixed 30 dB gain eliminates external feedback networks, while the open-collector CD pin provides real-time 10% THD clipping detection for dynamic gain compression.

Thermal management relies on the exposed slug-up PowerSO20 package (R_{th j-case} = 2 °C/W), and protection logic covers short circuit to GND/VS/load, overtemperature shutdown at 160 °C, load dump (50 V peak), and open-GND detection. Standby and mute functions are independently controlled with CMOS-compatible thresholds (V_SBon = 1.5 V, V_SBoff = 3.5 V).

Key Specifications

Pinout & Package

Package: PowerSO20 (slug-up) - thermally enhanced surface-mount package with exposed metal slug on bottom side for direct PCB thermal conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7391PD13TR, TDA7388 offers channel density at the expense of per-channel thermal headroom, while TPA3116D2 trades analog simplicity for efficiency and added filter design effort - choice depends on thermal budget, channel count, and EMI tolerance.

Availability

TDA7391PD13TR is available at Aetrix Electronics and suitable for automotive head units, aftermarket stereo boosters, compact audio distribution systems, and marine audio amplifier modules requiring stable component supply and automotive-grade thermal robustness.

Supply support for TDA7391PD13TR 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 and qualification capabilities.

The TDA7391PD13TR belongs to ST's automotive audio power amplifier product line, engineered specifically for high-reliability, high-power car radio applications where thermal resilience, protection integrity, and low-noise analog performance are critical.

FAQ

What is the maximum safe operating supply voltage for TDA7391PD13TR?

The absolute maximum DC supply voltage is 28 V, but the recommended operating range is 8–18 V. The device includes load-dump protection up to 50 V for 50 ms, allowing it to survive automotive battery transients without external clamping. Operation above 18 V continuously exceeds thermal limits and risks permanent damage even with full heatsinking.

How does the clipping detection (CD) pin function in practical circuit design?

The CD pin is an open-collector output that goes low when output THD reaches 10%, signaling onset of hard clipping. In practice, it drives an external comparator or microcontroller GPIO to trigger gain reduction or LED indicators. A 10 kΩ pull-up to +5 V is typical; the pin sinks <1 mA and requires no additional buffering for standard logic interfaces.

Can TDA7391PD13TR operate with single-ended input without degrading PSRR or CMRR?

Yes - the input stage accepts single-ended signals when one input (e.g., pin 14) is AC-coupled to signal ground and the other (pin 15) receives the signal. However, CMRR drops from 65 dB (differential) to ~55 dB due to imbalance; maintaining matched trace lengths and grounding near S-GND (pin 12) preserves PSRR above 60 dB across 20 Hz–20 kHz.

Is the PowerSO20 (slug-up) package compatible with standard reflow profiles for lead-free assembly?

Yes - the PowerSO20 (slug-up) package is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. The exposed slug must be soldered to a large copper thermal pad (≥4 cm²) with ≥8 thermal vias to inner ground planes to achieve rated 32 W output; insufficient thermal relief causes premature thermal shutdown at ~22 W.