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

STMicroelectronics TDA7391PDUTR

Name: TDA7391PDUTR
Brand: STMicroelectronics
SKU: TDA7391PDUTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7391PDUTR

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

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

Datasheet:: TDA7391PDUTR.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,157

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Product details

Overview

TDA7391PDUTR 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. Used as main output stage in automotive head units requiring robust thermal protection and pop-free mute/standby.

For engineers reviewing the TDA7391PDUTR datasheet, TDA7391PDUTR pinout, TDA7391PDUTR application, or TDA7391PDUTR equivalent, key selection criteria include bridge-mode output power into low-impedance loads (3.2–4 Ω), rail-to-rail swing without bootstrap capacitors, programmable turn-on/off delay via external RC, and diagnostic clipping detection output.

Technical Context

The TDA7391PDUTR implements a fully complementary PNP/NPN bridge output stage enabling 32 W into 3.2 Ω without bootstrap capacitors or Boucherot cells. Its internal fixed 30 dB gain and differential input architecture support both single-ended and balanced signal sources while maintaining ≥65 dB CMRR at 1 kHz.

Thermal protection triggers at 160 °C junction temperature, and short-circuit protection covers faults to GND, VS, and across the load. The open-collector CD pin asserts low during ≥10% output clipping, 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 - sufficient for mid-bass drivers in compact automotive head units
Supply Voltage Range	8–18 V - compatible with automotive battery transients (load dump up to 50 V peak)
Gain	30 dB (fixed) - eliminates external feedback network and gain-setting resistors
Input Impedance	36–60 kΩ (differential), 30–55 kΩ (single-ended) - minimizes loading on preamp stages
Clipping Detection	CD pin asserts low at ≥10% THD - enables real-time distortion monitoring and automatic gain reduction
Standby Current	≤100 µA - meets automotive infotainment low-power sleep requirements
Thermal Resistance	2 °C/W (junction-to-case) - supports high-power operation with slug-up heatsink interface

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1, 10, 11, 20	GND	Power ground return paths; multiple pins reduce impedance and improve thermal conduction
2, 19	OUTPUTS	Bridge outputs driving speaker load differentially; rail-to-rail swing without bootstrap caps
4	STAND-BY	CMOS-compatible digital input; low = full shutdown (≤100 µA), high = active mode
5, 16	+VS	Main supply inputs; dual pins reduce IR drop and enhance current handling
8	SYNC	RC programming pin for turn-on/off delay timing; connects to R2 to set bias ramp rate
9	MUTE	Capacitor connection point (C3 to GND) setting mute/standby transition time
12	S-GND	Signal ground reference for input stage; isolated from power GND to minimize noise coupling
14, 15	INPUTS	Differential input pair; accepts single-ended signals with matched input impedances
17	CD	Open-collector clipping detector output; low during ≥10% THD for system-level distortion response

Key Features

Feature	Design Value
No external bootstrap capacitors	Rail-to-rail output swing achieved via internal charge pump-free complementary output stage
Internally fixed 30 dB gain	Eliminates gain-setting resistors and associated layout sensitivity or drift
Programmable turn-on/off delay	RC network on SYNC/MUTE pins enables controlled bias ramping to prevent pop/click
Integrated clipping detection	CD pin provides real-time analog distortion flag without external comparator circuitry
Full short-circuit protection	Withstands faults to GND, VS, and load cross-connection without latch-up or damage

Applications

Car Stereo Head Unit Output Stage

Compact Rear-Seat Entertainment Amplifier

Use Scenario: Primary audio output driver in OEM or aftermarket automotive head units powering front door speakers.

IC Role / Device Role / Timing Role: Bridge-mode Class AB power amplifier delivering 32 W into 3.2 Ω with integrated thermal and short-circuit protection.

Use Value: Eliminates need for external protection diodes and bootstrap components, reducing BOM count by ≥4 passive parts per channel.

Use Scenario: Audio boost amplifier in rear-seat entertainment systems with space-constrained PCB layouts.

IC Role / Device Role / Timing Role: High-efficiency bridge driver supporting 4 Ω loads with ≤0.06% THD at 1 W output.

Use Value: Slug-up thermal interface enables direct heatsinking in tight enclosures, sustaining 26 W continuous output without forced air.

Automotive Subwoofer Driver

Aftermarket DSP Integration Amplifier

Use Scenario: Low-frequency driver in compact under-seat subwoofer modules requiring high current delivery.

IC Role / Device Role / Timing Role: High-current bridge amplifier capable of 4.5 A repetitive peak output into highly inductive loads.

Use Value: Built-in protection against very inductive loads prevents oscillation or latch-up during bass transients.

Use Scenario: Analog output stage following digital signal processors in premium aftermarket audio systems.

IC Role / Device Role / Timing Role: Differential-input amplifier accepting balanced DSP outputs while rejecting common-mode noise.

Use Value: ≥65 dB CMRR at 1 kHz ensures clean signal transfer despite noisy vehicle ECU environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7388	4×41 W quad-channel vs. TDA7391PDUTR's 1×32 W single-channel; higher channel count but lower per-channel thermal margin	Targeted at multi-speaker systems requiring independent channel control; not suitable for high-power mono subwoofer drive	Select when system requires ≥4 amplified channels with shared heatsink; avoid for single-channel >30 W demand
STA516B	Digital input (I²S), Class D efficiency (~85%) vs. Class AB linearity; no analog input pins or clipping detection output	Designed for DSP-based architectures with digital audio buses; lacks analog diagnostic features like CD pin	Select for battery-sensitive designs needing >80% efficiency; avoid when analog diagnostics or legacy preamp compatibility required

Compared with TDA7391PDUTR, TDA7388 offers channel density at the cost of per-channel thermal headroom, while STA516B trades analog flexibility and built-in diagnostics for Class D efficiency-making TDA7391PDUTR optimal for high-fidelity mono boost stages where analog integration and fault visibility are critical.

Availability

TDA7391PDUTR is available at Aetrix Electronics and suitable for automotive head units, rear-seat entertainment systems, and compact subwoofer modules requiring stable component supply and long-lifecycle support.

Supply support for TDA7391PDUTR 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, power ICs, sensors, and analog products for automotive, industrial, and consumer markets.

The TDA7391PDUTR belongs to ST's automotive audio power amplifier product line, engineered specifically for high-reliability, high-power analog audio output stages in vehicle infotainment systems operating under harsh electrical and thermal conditions.

FAQ

What is the maximum safe supply voltage for continuous operation?

The TDA7391PDUTR has an absolute maximum DC supply voltage of 28 V, but its recommended operating supply voltage range is 8–18 V. Continuous operation above 18 V risks exceeding thermal limits and triggering shutdown, even if within absolute max ratings. For automotive use, it is rated for load dump transients up to 50 V for 50 ms, handled by internal protection circuitry-not sustained operation.

Does the TDA7391PDUTR require external compensation capacitors?

No external compensation capacitors are required. The device uses an internally compensated design with fixed 30 dB gain and stable operation into 3.2 Ω loads. The absence of SVR capacitors, bootstrap capacitors, and Boucherot cells is explicitly stated in the datasheet as a key feature-enabling minimal external component count and simplified layout.

How does the clipping detection (CD) pin function in practice?

The CD pin is an open-collector output that pulls low when output distortion reaches or exceeds 10% THD. It remains high otherwise. This allows direct connection to a microcontroller GPIO or comparator to trigger automatic gain reduction, LED indicators, or system-level diagnostics-without external sensing circuitry. The threshold is factory-trimmed and does not require calibration.

Can the TDA7391PDUTR drive 2 Ω loads?

No-the datasheet specifies guaranteed operation only down to 3.2 Ω (EIAJ-compliant) and 4 Ω. Driving 2 Ω loads exceeds safe current limits (4.5 A repetitive peak), risks thermal shutdown, and voids specified performance (e.g., distortion, power). ST does not characterize or guarantee functionality below 3.2 Ω, and doing so may cause premature failure under sustained conditions.

TDA7391PDUTR 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:: -

Qualification:: -

Supplier Device Package:: PowerSO-20

TDA7391PDUTR FAQ

1.How can I place an order for TDA7391PDUTR through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7391PDUTR 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 TDA7391PDUTR reliable?

The price and inventory of TDA7391PDUTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7391PDUTR is usually 5 days.

3.What payment methods are accepted for TDA7391PDUTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7391PDUTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7391PDUTR?

TDA7391PDUTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7391PDUTR 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 TDA7391PDUTR?

For technical support, including TDA7391PDUTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7391PDUTR requirements.

6.How does Aetrix verify that TDA7391PDUTR is sourced from the original manufacturer or authorized distributors?

All TDA7391PDUTR 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 TDA7391PDUTR meets industry standards.

7.What is the process for return or replacement of TDA7391PDUTR?

All TDA7391PDUTR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7391PDUTR, 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 TDA7391PDUTR part is unused and in its original packaging.

Return procedure for TDA7391PDUTR:

1.Submit a request within 90 days.

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

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