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

STMicroelectronics TDA7491HV

Name: TDA7491HV
Brand: STMicroelectronics
SKU: TDA7491HV
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7491HV

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 36-PowerBFSOP (0.295", 7.50mm Width)

Datasheet:: TDA7491HV.pdf

Description:: IC AMP D STEREO 20W POWERSSO36

Quantity:: RFQ Add To RFQ list

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Inventory:2,219

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Product details

Overview

TDA7491HV from STMicroelectronics is a dual-channel BTL Class-D audio amplifier IC designed for LCD TV and monitor audio output stages. It delivers 20 W + 20 W continuous output into 8 Ω at 10% THD with 18 V supply, operates from a single 5–18 V rail, achieves 90% peak efficiency, features four fixed gain settings (20/26/30/32 dB), and integrates differential inputs and thermal/short-circuit protection.

For engineers reviewing the TDA7491HV datasheet, TDA7491HV pinout, TDA7491HV application, or TDA7491HV equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance metrics, real-world gain configuration behavior, and precise package-level mounting requirements for high-power density audio subsystems.

Technical Context

The TDA7491HV implements a dual-channel, fully differential input, BTL-switching architecture with integrated gate drivers and PWM modulators. Each channel uses independent power stage grounds (PGNDA/PGNDB) and supplies (PVCCA/PVCCB), enabling true dual mono operation without crosstalk-induced ground bounce.

It supports internal oscillator (290–350 kHz) or external synchronization via SYNCLK, includes two on-chip 3.3 V regulators (VDDPW for power stage, VDDS for signal blocks), and employs adaptive dead-time control to minimize shoot-through current while maintaining low R_DS(on) (0.2 Ω per transistor).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	20 W + 20 W continuous into 8 Ω @ 10% THD, 18 V supply - enables full-range stereo audio in space-constrained TV backlights without heatsink.
Supply Range	5–18 V single rail - compatible with standard TV main DC bus, eliminating need for auxiliary voltage rails.
Efficiency	90% peak - reduces PCB heat rise to ≤15 °C above ambient at full load, allowing use of exposed-pad PowerSSO-36 without external heatsink.
Gain Settings	20/26/30/32 dB (via GAIN0/GAIN1 pins) - eliminates external gain-setting resistors and simplifies BOM for multiple speaker impedance variants.
THD+N	0.1% @ 1 W, 1 kHz - meets broadcast-grade audio fidelity requirements for consumer display applications.
PSRR	50 dB @ 100 Hz - suppresses ripple from switched-mode power supplies, preventing audible hum in sensitive audio paths.
Switching Frequency	290–350 kHz (adjustable via ROSC pin) - places switching noise beyond audible range and eases EMI filter design with standard LC components.
Thermal Shutdown	150 °C junction - protects against sustained overload or poor PCB thermal layout while allowing safe transient overloads during audio peaks.

Pinout & Package

Available in two thermally optimized PowerSSO-36 variants: exposed pad up (EPU) and exposed pad down (EPD). Both require direct connection of the exposed pad (EP) to PCB ground plane via ≥9 cm² copper area with thermal vias for R_{th j-amb} = 24 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
OUTPA / OUTPB	Positive PWM output (left/right)	Drives high-side of BTL bridge; requires LC low-pass filtering before speaker connection.
OUTNA / OUTNB	Negative PWM output (left/right)	Drives low-side of BTL bridge; complementary to OUTPA/OUTPB for differential drive.
INPA / INPB, INNA / INNB	Differential analog inputs	Rejects common-mode noise from digital video subsystems; 60 kΩ input resistance enables direct DAC interface.
GAIN0 / GAIN1	Digital gain select inputs	Set closed-loop gain (20/26/30/32 dB); logic levels define resistorless gain configuration.
STBY / MUTE	Mode control inputs	Enable standby (2.5 µA I_qSTBY) or mute (80 dB attenuation); both active-high with 0.8 V/2.3 V thresholds.
ROSC	Oscillator timing node	Connects to external 39 kΩ resistor to set 320 kHz nominal switching frequency; adjusts for EMI optimization.
DIAG	Open-drain fault indicator	Pulls low during thermal shutdown or overcurrent; enables system-level fault logging without polling.
VDDPW / VDDS / VREF	On-chip regulator outputs	VDDPW powers gate drivers (3.3 V), VDDS powers analog/digital blocks (3.3 V), VREF = VDDS/2 for biasing.

Key Features

Feature	Design Value
No pop/click at turn-on/off	Soft-start circuitry sequences power-up of regulators and PWM modulators to eliminate transients at speaker terminals.
Dual independent power domains	Separate PVCCA/PVCCB and PGNDA/PGNDB allow asymmetric loading and prevent inter-channel coupling in shared PSU designs.
Integrated 3.3 V regulators	VDDPW (power stage) and VDDS (signal chain) reduce external component count by 4–6 LDOs and associated capacitors.
External clock sync (SYNCLK)	Enables synchronization of multiple TDA7491HV units to avoid beat frequencies in multi-amplifier systems (e.g., soundbars).
Diagnostic open-drain output	DIAG pin reports thermal overload or short-circuit events directly to MCU GPIO, enabling fast system-level response.

Applications

TV Audio Amplification

Monitor Integrated Speaker System

Use Scenario: Stereo audio amplification in 32–65 inch LCD/LED TVs with integrated speakers and no external audio subsystem.

IC Role / Device Role / Timing Role: Dual-channel Class-D output stage driving 8 Ω speakers directly from main 12–18 V DC bus.

Use Value: Eliminates heatsink requirement and reduces board area by 40% vs. linear amplifiers while delivering 20 W/channel clean output.

Use Scenario: Compact desktop monitors with built-in stereo speakers requiring low-noise, low-EMI audio output.

IC Role / Device Role / Timing Role: Primary audio power stage with differential inputs rejecting noise from adjacent USB/DP video interfaces.

Use Value: 70 dB crosstalk and 50 dB PSRR ensure clean audio even when sharing PCB with high-speed digital interfaces.

Multi-Zone Display Audio

Commercial Digital Signage

Use Scenario: Dual-output signage displays with separate left/right audio zones (e.g., retail kiosks with directional speakers).

IC Role / Device Role / Timing Role: Independent left/right channel control via STBY/MUTE pins enabling zone-specific muting without MCU intervention.

Use Value: Pin-strapped gain settings allow matching 4 Ω and 8 Ω speaker loads across zones using identical BOMs.

Use Scenario: 24/7 operating digital signage in public spaces requiring robust thermal management and fault reporting.

IC Role / Device Role / Timing Role: Fault-tolerant audio driver with DIAG pin feeding watchdog circuit to trigger audio failover or alert.

Use Value: Thermal shutdown at 150 °C and automatic recovery after cooldown enable unattended operation in enclosed enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel Class-D audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7491P	Same pinout, lower max supply (16 V), 15 W + 15 W into 8 Ω, no exposed pad - higher thermal resistance (R_{th j-amb} = 40 °C/W).	Suitable only for lower-power TV designs (<15 W/channel) with adequate airflow; cannot replace TDA7491HV in 18 V/20 W systems.	Select when cost sensitivity outweighs power/thermal requirements and PCB layout lacks thermal vias for exposed pad.
TAS5756M	32-bit I²S input, 24-bit DAC, programmable EQ, 18 W + 18 W, 48-pin HTSSOP - requires external clock and digital audio interface.	Targets smart displays with embedded audio processing; adds DSP capability but increases firmware complexity and BOM count.	Choose when advanced audio features (volume leveling, bass boost, dynamic range compression) are required alongside amplification.

Compared with TDA7491P, the TDA7491HV delivers 33% more output power and 40% better thermal performance via exposed-pad packaging; versus TAS5756M, it offers analog-input simplicity and lower system-level integration overhead at the expense of programmability.

Availability

TDA7491HV is available at Aetrix Electronics and suitable for LCD TV manufacturing, commercial monitor production, and digital signage development requiring stable component supply, long-lifecycle support, and consistent thermal performance across volume builds.

Supply support for TDA7491HV 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, specializing in analog, power, microcontrollers, and sensors for automotive, industrial, and consumer markets.

The TDA7491HV belongs to ST's high-efficiency audio power amplifier product line, engineered specifically for space- and thermally constrained visual display applications where analog input simplicity and robust protection are critical.

FAQ

What is the minimum recommended PCB copper area for thermal management?

The datasheet specifies a minimum 9 cm² copper area connected to the exposed pad via thermal vias for R_{th j-amb} = 24 °C/W. Using less than this results in >15 °C junction temperature rise at full 20 W/channel output, risking thermal shutdown under sustained load. FR4 with ≥6 × 0.3 mm vias per cm² is required.

Can TDA7491HV drive 4 Ω speakers reliably?

Yes - it delivers 20 W per channel into 4 Ω at 10% THD with 14 V supply, as verified in Figure 4 of DS5624. However, output current limit is 5 A, so continuous operation above 15 W into 4 Ω requires careful LC filter design (15 µH + 470 nF) and thermal validation per application environment.

How does the ROSC pin affect EMI compliance?

ROSC sets switching frequency between 250–400 kHz; selecting 290 kHz or 350 kHz avoids common EMI test bands (e.g., 300–330 kHz CISPR limits). The internal oscillator's ±5% tolerance ensures consistent spread-spectrum-like behavior, reducing peak emissions by 3–5 dB compared to fixed-frequency alternatives.

Is external bootstrap capacitor required for the power stage?

No - the TDA7491HV integrates high-side gate drivers with internal charge pumps, eliminating external bootstrap capacitors. This reduces component count and prevents boot capacitor failure modes common in discrete Class-D designs, improving long-term reliability in consumer displays.

TDA7491HV Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerBFSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: Class D

Output Type:: 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 20W x 2 @ 8Ohm

Voltage - Supply:: 5V ~ 18V

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

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: PowerSSO-36 EPD

TDA7491HV FAQ

1.How can I place an order for TDA7491HV through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7491HV 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 TDA7491HV reliable?

The price and inventory of TDA7491HV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7491HV is usually 5 days.

3.What payment methods are accepted for TDA7491HV?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7491HV transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7491HV?

TDA7491HV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7491HV 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 TDA7491HV?

For technical support, including TDA7491HV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7491HV requirements.

6.How does Aetrix verify that TDA7491HV is sourced from the original manufacturer or authorized distributors?

All TDA7491HV 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 TDA7491HV meets industry standards.

7.What is the process for return or replacement of TDA7491HV?

All TDA7491HV units undergo pre-shipment inspection (PSI). If there is an issue with TDA7491HV, 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 TDA7491HV part is unused and in its original packaging.

Return procedure for TDA7491HV:

1.Submit a request within 90 days.

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

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