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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics E-TDA7391PDTR

Name: E-TDA7391PDTR
Brand: STMicroelectronics
SKU: E-TDA7391PDTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-TDA7391PDTR

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Datasheet:: E-TDA7391PDTR.pdf

Description:: IC AMP AB MONO 40W POWERSO-20

Quantity:: RFQ Add To RFQ list

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Product details

Overview

E-TDA7391PDTR from STMicroelectronics is a 32 W bridge-type Class AB audio power amplifier in PowerSO20 (slug-up) package, designed for automotive radio boosters and high-end car audio systems. It delivers 32 W into 3.2 Ω at 14.4 V/1 kHz/10% THD, features differential or single-ended inputs, fixed 30 dB gain, CMOS-compatible standby, and integrated clipping detection.

For engineers reviewing the E-TDA7391PDTR datasheet, E-TDA7391PDTR pinout, E-TDA7391PDTR application, or E-TDA7391PDTR equivalent, key selection criteria include output power capability into low-impedance loads (3.2 Ω), rail-to-rail bridge output swing without bootstrap capacitors, thermal shutdown at 160 °C, and programmable mute/standby timing via external RC network.

Technical Context

The TDA7391PDTR implements a fully complementary PNP/NPN bridge output stage with internal biasing, enabling operation down to 3.2 Ω loads and eliminating need for external bootstrap or Boucherot components. Its differential input architecture supports both single-ended and balanced signal sources while maintaining ≥65 dB common-mode rejection at 1 kHz.

Protection circuitry includes short-circuit detection (to GND, VS, and across load), overtemperature shutdown at 160 °C, load-dump tolerance up to 50 V peak (50 ms), and open-GND fault handling. The on-chip clipping detector (CD pin) asserts low during ≥10% THD, enabling external gain compression control.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	32 W @ 3.2 Ω, 14.4 V, 1 kHz, 10% THD - enables high-fidelity mid-bass drive in compact car radio designs
Voltage Gain	30 dB (typ.) - fixed internal gain eliminates external feedback network, reducing BOM count and layout sensitivity
Input Impedance	36–60 kΩ (differential), 30–55 kΩ (single-ended) - compatible with standard preamp outputs without loading distortion
Supply Range	8–18 V DC - matches automotive battery voltage range including cold-crank (8 V) and load-dump transients (up to 50 V peak)
Standby Current	≤100 µA - ensures negligible battery drain during vehicle ignition-off periods
Thermal Resistance	2 °C/W (junct-to-case) - supports high-power dissipation with minimal heatsink mass when mounted to PCB copper slug
Clipping Threshold	Detects ≥10% THD on output - provides real-time distortion flag for automatic volume limiting or LED indication

Pinout & Package

Package: PowerSO20 (slug-up) - thermally enhanced 20-pin surface-mount package with exposed metal slug on top side for direct PCB copper thermal coupling.

Pin/Terminal	Circuit Role	Design Meaning
1, 10, 11, 20	GND	Power ground return paths - must be connected to low-impedance PCB plane to minimize ground bounce and thermal resistance
12	S-GND	Signal ground reference - isolated from power GND to prevent noise coupling into sensitive input stage
2, 19	OUTPUTS	Bridge output terminals - deliver rail-to-rail differential voltage swing to 3.2 Ω load without bootstrap capacitors
5, 16	+VS	Main supply inputs - dual connections reduce trace inductance and improve high-current delivery stability
14, 15	INPUTS	Differential input pair - accepts either balanced signal or single-ended (one pin AC-coupled to S-GND) with matched impedance requirement
4	STAND-BY	CMOS-compatible enable input - logic-low disables all internal bias, reducing current to ≤100 µA
8	SYNC	RC timing input for standby/mute delay - connects to GND via resistor (R2) to set turn-on/off ramp rate
9	MUTE	Capacitor connection point - C3 to GND sets mute duration and prevents audible pop during transitions
17	CD	Open-collector clipping detect - pulls low when output THD ≥10%, enabling external gain control or status monitoring

Key Features

Feature	Design Value
No bootstrap capacitors required	Rail-to-rail bridge output swing achieved via internal charge pump-free complementary output stage, reducing component count and board area
Internally fixed 30 dB gain	Eliminates external feedback resistors and associated noise/thermal drift, ensuring consistent gain across temperature and unit variance
Programmable mute/standby timing	RC network on pins 8 (SYNC) and 9 (MUTE) allows precise control of turn-on/off delay to suppress transients in head-unit sequencing
Integrated clipping detection	On-die comparator monitors output waveform distortion in real time and asserts CD pin at ≥10% THD for system-level protection
Full short-circuit protection	Withstands sustained shorts to GND, VS, and across load without latch-up or damage, supporting robust automotive deployment

Applications

Car Stereo Booster Amplifier

High-End OEM Head Unit Output Stage

Use Scenario: Boosting line-level signals from digital signal processors to drive 3.2 Ω midrange speakers in compact dashboard enclosures.

IC Role / Device Role / Timing Role: Final-stage bridge amplifier delivering 32 W continuous power with <0.06% THD at 1 W, synchronized to head-unit mute/standby commands.

Use Value: Eliminates need for external gain-setting resistors and bootstrap caps, reducing BOM cost by ≥3 components per channel while maintaining EIAJ 40 W compliance.

Use Scenario: Integrated output stage in premium automotive infotainment systems requiring low-noise, high-SVR performance under wide battery voltage swings.

IC Role / Device Role / Timing Role: Dual-channel Class AB driver with 60 dB supply rejection and 65 dB CMRR, operating from 8–18 V with automatic pop-free muting.

Use Value: Enables direct integration into space-constrained PCB layouts using PowerSO20 slug-up thermal interface, achieving 32 W output with ≤2 °C/W junction-to-case resistance.

Aftermarket Audio DSP Interface

Compact Vehicle Infotainment Subwoofer Driver

Use Scenario: Interfacing with external DSP modules that provide balanced analog outputs for noise-immune signal routing in noisy vehicle environments.

IC Role / Device Role / Timing Role: Differential-input audio power stage accepting ±1 Vrms balanced input, with programmable mute delay to align with DSP boot sequence.

Use Value: 36–60 kΩ differential input impedance prevents loading of precision DAC outputs, preserving dynamic range and minimizing intermodulation distortion.

Use Scenario: Driving 4 Ω subwoofer channels in compact rear-deck amplifiers where thermal management is constrained by enclosure size.

IC Role / Device Role / Timing Role: High-efficiency bridge amplifier delivering 26 W @ 4 Ω with thermal shutdown at 160 °C and load-dump survival up to 50 V peak.

Use Value: Internal overtemperature and load-dump protection eliminate need for external TVS or thermal cutoffs, simplifying safety certification for ISO 7637-2 compliance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7377A	Higher 45 W output into 2 Ω, but requires external bootstrap capacitors and has no integrated clipping detector	Targeted at ultra-high-power subwoofer drivers rather than midrange stereo boosters	Select when >32 W into ≤2 Ω is required and board space allows additional capacitors
TPA5560DAP	Class D topology (90% efficiency), 30 W into 4 Ω, but lacks differential inputs and requires external gate drivers	Suitable for thermally constrained designs needing lower heat dissipation, not legacy Class AB compatibility	Select when efficiency >85% and thermal budget <10 W is mandatory, accepting higher EMI filtering complexity

Compared with TDA7377A and TPA5560DAP, the E-TDA7391PDTR uniquely combines Class AB linearity, differential input flexibility, zero-external-gain-setting, and integrated clipping detection - making it optimal for cost-sensitive, space-limited car radio booster designs requiring predictable THD behavior and minimal support components.

Availability

E-TDA7391PDTR is available at Aetrix Electronics and suitable for car stereo booster amplifiers, OEM head unit output stages, aftermarket audio DSP interfaces, and compact vehicle infotainment subwoofer drivers requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for E-TDA7391PDTR 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 microcontrollers, analog ICs, power management devices, and automotive-grade components for industrial, consumer, and automotive markets.

The TDA7391 series belongs to ST's automotive audio power amplifier product line, engineered specifically for high-fidelity, thermally robust Class AB amplification in space-constrained car radio and infotainment systems.

FAQ

What is the maximum safe supply voltage for continuous operation of the E-TDA7391PDTR?

The absolute maximum DC supply voltage is 28 V, but continuous operation must remain within the operating supply range of 8–18 V. Exceeding 18 V risks exceeding thermal limits and triggering protection circuits. Peak supply transients up to 50 V are tolerated for ≤50 ms per ISO 7637-2 Pulse 5a, provided external clamping is used for sustained overvoltage conditions.

How does the clipping detection (CD) pin function, and what external circuitry is needed?

The CD pin is an open-collector output that pulls low when output THD reaches or exceeds 10%. It requires an external pull-up resistor (typically 10 kΩ to +5 V) to generate a logic-level signal. This output can directly drive an LED indicator or feed into a microcontroller GPIO to trigger automatic gain reduction or user alerts without additional signal conditioning.

Can the E-TDA7391PDTR operate with single-ended input signals, and how should the input be configured?

Yes - the input stage accepts single-ended signals by capacitively coupling the signal to one input pin (e.g., pin 14) while connecting the other (pin 15) to signal ground (S-GND) through a matching impedance. Input impedance remains 30–55 kΩ in this mode. Both inputs must see equal source impedances to preserve common-mode rejection and minimize offset-induced distortion.

What thermal design considerations apply to the PowerSO20 (slug-up) package?

The PowerSO20 (slug-up) package requires direct thermal contact between its exposed top-side metal slug and a large copper pour on the PCB's top layer, connected via multiple thermal vias to inner-layer and bottom-layer ground planes. ST recommends ≥400 mm² of 2-oz copper per watt dissipated. Junction-to-case thermal resistance is 2 °C/W, so at 32 W output, case temperature must stay ≤85 °C to avoid derating - achievable only with adequate copper area and airflow.

E-TDA7391PDTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Class AB

Output Type:: 1-Channel (Mono)

Max Output Power x Channels @ Load:: 40W x 1 @ 3.2Ohm

Voltage - Supply:: 8V ~ 18V

Features:: Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Standby

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: -

Supplier Device Package:: PowerSO-20

E-TDA7391PDTR FAQ

1.How can I place an order for E-TDA7391PDTR through Aetrix?

Please submit a Request for Quotation (RFQ) for E-TDA7391PDTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for E-TDA7391PDTR reliable?

The price and inventory of E-TDA7391PDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-TDA7391PDTR is usually 5 days.

3.What payment methods are accepted for E-TDA7391PDTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-TDA7391PDTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-TDA7391PDTR?

E-TDA7391PDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-TDA7391PDTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for E-TDA7391PDTR?

For technical support, including E-TDA7391PDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-TDA7391PDTR requirements.

6.How does Aetrix verify that E-TDA7391PDTR is sourced from the original manufacturer or authorized distributors?

All E-TDA7391PDTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that E-TDA7391PDTR meets industry standards.

7.What is the process for return or replacement of E-TDA7391PDTR?

All E-TDA7391PDTR units undergo pre-shipment inspection (PSI). If there is an issue with E-TDA7391PDTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The E-TDA7391PDTR part is unused and in its original packaging.

Return procedure for E-TDA7391PDTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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