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

STMicroelectronics TDA7576B

Name: TDA7576B
Brand: STMicroelectronics
SKU: TDA7576B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7576B

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: Multiwatt-15 (Vertical, Bent and Staggered Leads)

Datasheet:: TDA7576B.pdf

Description:: IC AMP AB STER 45W MULTIWATT-15

Quantity:: RFQ Add To RFQ list

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Inventory:1,527

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Product details

Overview

TDA7576B from STMicroelectronics is a dual-bridge MOSFET audio power amplifier designed for 24 V battery systems in commercial vehicles. It delivers 2 × 20 W into 4 Ω at 24 V/1 kHz (10 % THD), integrates clip/offset/short-circuit diagnostics, and operates without external decoupling or bootstrap capacitors - enabling compact truck audio head units.

For engineers reviewing the TDA7576B datasheet, TDA7576B pinout, TDA7576B application, or TDA7576B equivalent, key selection criteria include rail-to-rail MOSFET output swing, HVCC half-supply buffer architecture, diagnostic pin behavior under thermal foldback, and compatibility with 24 V automotive supply transients up to 60 V load dump.

Technical Context

The TDA7576B uses a fully complementary P-channel/N-channel MOSFET output stage enabling rail-to-rail voltage swing and minimizing saturation losses. Its unique single-ended topology eliminates output DC-blocking capacitors by referencing both speaker terminals to an internally buffered HVCC (half-V_CC) node.

It implements three independent diagnostics: open-collector CD pin asserts low on clipping (THD ≥ 2 %), short circuit, or thermal warning (T_j ≈ 140 °C); OD pin asserts low on output DC offset > ±3 V; and thermal foldback begins at ~140 °C with full mute at ~160 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	2 × 20 W @ 4 Ω, 24 V, 1 kHz, 10 % THD - sufficient for dual midrange speakers in cabin audio
Supply Voltage Range	8–32 V operating, 60 V peak load dump tolerance - compatible with 24 V truck/bus battery systems
THD+N	0.05 % typ @ 4 W, 1 kHz - low distortion preserves vocal clarity in noisy vehicle environments
Crosstalk	50 dB @ 1 kHz, 4 W - prevents left/right channel bleed in stereo cabin playback
Quiescent Current	90–130 mA @ 28 V - enables low-power standby mode with <10 µA consumption
Diagnostic Pins	CD (clip/short/thermal) and OD (DC offset) open-collector outputs - enable fail-safe system monitoring without external logic
Thermal Protection	Thermal foldback starts at ~140 °C; mute at ~160 °C - maintains partial audio during overheating instead of hard shutdown

Pinout & Package

Package: Multiwatt15 (vertical, 15-pin through-hole), RoHS-compliant ECOPACK® variant. Thermal resistance junction-to-case is 2 °C/W - requires direct heatsink mounting via exposed metal tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (CD)	Clip/Diagnostic open-collector output	Drives low on clipping (THD ≥ 2 %), short circuit, or thermal warning - shared fault reporting
2 (OD)	Offset detector open-collector output	Drives low if output DC offset exceeds ±3 V - protects speakers from thermal damage
3 (IN2), 14 (IN1)	Differential audio inputs	High-impedance (55 kΩ) inputs accept line-level stereo signals; max 5 V range
6 (OUT2), 11 (OUT1)	Bridge-tied load outputs	MOSFET-driven outputs; each drives one speaker terminal - no external coupling caps needed
9 (HVCC)	Half-supply buffer output	Internally generated V_CC/2 reference - common node for speaker return paths, eliminating ground-loop hum
13 (STBY), 15 (PM)	Control inputs	STBY pin enables deep sleep (<10 µA); PM pin mutes output with 90 dB attenuation

Key Features

Feature	Design Value
No external decoupling capacitors	Eliminates two large electrolytics per channel - reduces PCB area and cost in space-constrained head units
Internally fixed gain (26 dB)	Removes need for external feedback resistors - simplifies layout and improves production consistency
Rail-to-rail MOSFET output stage	Maximizes voltage swing across 4 Ω loads - increases usable output power without raising supply voltage
60 V load dump protection	Withstands ISO 7637-2 Pulse 5a transients - meets commercial vehicle electrical system requirements
Integrated HVCC buffer	Provides stable half-supply reference for speaker common-mode - suppresses ground noise and enables capacitorless BTL operation

Applications

Truck Cabin Audio Head Unit

Bus Public Address System

Use Scenario: Stereo audio playback in heavy-duty truck cab with high ambient noise and wide temperature swings.

IC Role / Device Role / Timing Role: Dual-channel Class-AB MOSFET power amplifier driving 4 Ω midrange speakers directly from 24 V battery.

Use Value: 20 W/channel output sustains intelligible voice/music at highway noise levels; 60 V load dump rating ensures reliability during alternator regulation faults.

Use Scenario: Multi-zone PA amplification in city transit buses with centralized audio source and distributed speaker zones.

IC Role / Device Role / Timing Role: Dual-bridge amplifier powering two independent 4 Ω speaker zones from single 24 V bus.

Use Value: Integrated diagnostics (CD/OD pins) feed microcontroller for real-time fault logging; standby mode cuts quiescent current to <10 µA during overnight parking.

Off-Highway Vehicle Infotainment

Mobile Equipment Communication Console

Use Scenario: Audio interface in construction equipment cabs where EMI, vibration, and thermal cycling degrade conventional amplifiers.

IC Role / Device Role / Timing Role: High-reliability audio driver with thermal foldback and short-circuit protection for ruggedized displays.

Use Value: Thermal foldback (~140 °C) maintains partial audio during sustained high-power operation - avoids abrupt mute during critical operator alerts.

Use Scenario: Voice communication module in emergency response vehicles requiring clear intercom and siren tone playback.

IC Role / Device Role / Timing Role: Low-THD dual amplifier handling both narrowband comms and wideband siren waveforms simultaneously.

Use Value: 0.05 % THD at 4 W preserves speech fidelity; clip detection (2 % THD threshold) triggers automatic gain reduction before audible distortion occurs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7560	Same Multiwatt15 package but rated for 12 V systems (max 18 V); lower 2 × 15 W output @ 4 Ω	Lacks 60 V load dump rating and HVCC buffer - unsuitable for 24 V truck platforms	Select only for 12 V coach or RV applications where supply stability is guaranteed
TPA5052	36 V max supply, 2 × 25 W @ 4 Ω, but requires external bootstrap and decoupling capacitors	Higher efficiency (85 % vs 75 %) but larger BOM and board area due to 6 extra passive components	Prefer when thermal budget allows smaller heatsink and design tolerates added component count

Compared with TDA7576B, TDA7560 lacks 24 V system robustness and diagnostic integration, while TPA5052 trades higher power for increased external component dependency - making TDA7576B optimal for space-constrained, high-reliability 24 V commercial vehicle audio.

Availability

TDA7576B is available at Aetrix Electronics and suitable for truck cabin audio head units, bus public address systems, off-highway vehicle infotainment, and mobile equipment communication consoles requiring stable component supply across extended temperature and voltage ranges.

Supply support for TDA7576B 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-grade analog, power, and microcontroller solutions.

The TDA7576B belongs to ST's automotive audio power amplifier product line, engineered specifically for 24 V commercial vehicle platforms with emphasis on transient resilience, integrated diagnostics, and capacitorless output architecture.

FAQ

What is the purpose of the HVCC pin?

HVCC provides an internally buffered half-supply voltage reference used as the common-mode node for both speaker outputs. This eliminates the need for output DC-blocking capacitors and reduces ground-loop noise in vehicle audio systems. The pin sources/sinks current proportional to the difference between left and right channel outputs, requiring adequate PCB copper pour for thermal management.

How does the CD pin behave during thermal events?

The CD pin is an open-collector output that pulls low during thermal warning (~140 °C), clipping (THD ≥ 2 %), or output short circuits. During thermal foldback, it remains asserted low while audio gain is progressively reduced; it stays low until junction temperature falls below the hysteresis threshold (~130 °C), ensuring reliable fault latching without external circuitry.

Can TDA7576B drive 2 Ω loads?

No - the device is characterized and specified only for 4 Ω minimum loads. Driving 2 Ω loads exceeds safe operating area limits, risks thermal runaway due to increased power dissipation, and voids protection features including short-circuit detection. ST's datasheet explicitly prohibits operation below 4 Ω to ensure reliability in 24 V vehicle environments.

Is external compensation required for stability?

No - the TDA7576B features internally fixed compensation optimized for unity-gain stability with standard 4 Ω loudspeaker loads. No external RC networks or compensation capacitors are needed, reducing bill-of-materials and eliminating tuning steps during production. Stability is verified across temperature, supply voltage, and load variations per ST's production test flow.

TDA7576B Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: Multiwatt-15 (Vertical, Bent and Staggered Leads)

Packaging:: Tube

Product Status:: Active

Type:: Class AB

Output Type:: 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 45W x 2 @ 4Ohm

Voltage - Supply:: 8V ~ 32V

Features:: Mute, Short-Circuit and Thermal Protection

Mounting Type:: Through Hole

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

Grade:: -

Qualification:: -

Supplier Device Package:: Multiwatt-15

TDA7576B FAQ

1.How can I place an order for TDA7576B through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7576B 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 TDA7576B reliable?

The price and inventory of TDA7576B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7576B is usually 5 days.

3.What payment methods are accepted for TDA7576B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7576B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7576B?

TDA7576B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7576B 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 TDA7576B?

For technical support, including TDA7576B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7576B requirements.

6.How does Aetrix verify that TDA7576B is sourced from the original manufacturer or authorized distributors?

All TDA7576B 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 TDA7576B meets industry standards.

7.What is the process for return or replacement of TDA7576B?

All TDA7576B units undergo pre-shipment inspection (PSI). If there is an issue with TDA7576B, 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 TDA7576B part is unused and in its original packaging.

Return procedure for TDA7576B:

1.Submit a request within 90 days.

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

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