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

STMicroelectronics E-TDA7566

Name: E-TDA7566
Brand: STMicroelectronics
SKU: E-TDA7566
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-TDA7566

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: E-TDA7566.pdf

Description:: IC AMP AB QUAD 60W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:2,468

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Product details

Overview

E-TDA7566 from STMicroelectronics is a quad-channel Class AB automotive audio power amplifier in Flexiwatt25 package, delivering 4 × 40 W into 4 Ω at 14.4 V (10% THD), featuring integrated I²C-controlled diagnostics, independent front/rear soft mute/play, selectable 12 dB/26 dB gain, and clipping detection with 1%/10% threshold selection - deployed in OEM car radio head units for full-featured multi-zone audio output.

For engineers reviewing the E-TDA7566 datasheet, E-TDA7566 pinout, E-TDA7566 application, or E-TDA7566 equivalent, key selection criteria include its 4-channel bridge output architecture, real-time speaker fault reporting via I²C, thermal protection with 1 °C/W junction-to-case resistance, and dual-mode diagnostics (turn-on + permanent) for production-grade automotive audio system validation.

Technical Context

The E-TDA7566 implements a BCD-DMOS quad bridge output stage enabling low-distortion amplification (0.04% typ. THD at 1 W) and high efficiency across 2 Ω–4 Ω loads. Its diagnostic engine performs subsonic current-pulse-based turn-on checks (100 ms acquisition) and continuous permanent monitoring (1 ms interval) to detect short-to-GND, short-to-VS, open load, and speaker cross-short conditions per channel.

I²C interface supports full configuration: standby control, individual channel mute/play sequencing, gain switching, clip detector threshold selection, and readback of fault status registers (IB1/IB2/DB1–DB4). The device operates within 8–18 V supply range and integrates DC offset detection (2 V typical), SVR ≥ 60 dB (100 Hz–10 kHz), and 90 dB standby attenuation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 40 W max into 4 Ω @ 14.4 V, 1 kHz, 10% THD - enables loud, distortion-limited audio in compact car radio enclosures without forced cooling.
THD+N	0.04% typ. @ 1 W, 4 Ω - ensures clean mid-bass reproduction critical for OEM voice guidance and media playback fidelity.
Supply Range	8–18 V operating voltage - accommodates automotive battery transients and cold-crank (7.5 V min. startup threshold) without brownout.
I²C Speed	Up to 400 kHz clock frequency - allows fast configuration and real-time fault polling in microcontroller-driven infotainment systems.
Thermal Resistance	R_{th j-case} = 1 °C/W - supports sustained 4-channel operation up to 70 °C case temperature with standard heatsinking.
Clipping Detection	Selectable 1% or 10% THD threshold via IB1 bit - enables adaptive signal limiting for tweeter protection or dynamic range compression.
Standby Current	25–100 µA - meets automotive ISO 8859-3 quiescent power requirements for always-on head unit architectures.

Pinout & Package

Package: Flexiwatt25 (25-pin vertical-mount power package with integral heat sink tab; mechanical outline per Figure 28, Doc ID 9801 Rev 6).

Pin/Terminal	Circuit Role	Design Meaning
1, 25, 16, 10, 4, 20, 17, 18, 19, 21, 24, 23, 9, 8, 7, 5, 2, 3	Power Ground / PW_GND / S_GND / AC_GND	Dedicated ground returns isolate analog, digital, and power domains to suppress crosstalk and prevent ground bounce during high-current switching.
6, 11, 14, 15, 22	Channel Outputs (LF+, LF−, RF+, RF−, RR+, RR−, LR+, LR−)	Eight differential bridge outputs support four independent 2-way speaker channels with ±100 mA DC offset tolerance.
12, 13	I²C Data (DATA) and Clock (CLK)	Open-drain bidirectional interface compliant with standard I²C timing (400 kHz max); requires external 4.7 kΩ pull-up resistors.
26 (TAB)	Thermal Pad / High-Current Ground	Exposed metal tab serves as primary thermal path and low-inductance power return - must be soldered to PCB copper pour for R_{th j-case} compliance.

Key Features

Feature	Design Value
Per-channel diagnostics	Independent turn-on and permanent fault detection (short-to-GND/VS, open/shorted speaker) reported via I²C register DB1–DB4 - eliminates need for external sense circuitry.
Configurable gain	Software-selectable 12 dB or 26 dB voltage gain per channel - matches input sensitivity of diverse source modules (e.g., DSP vs. analog tuner).
Soft mute/play	Front/rear channel mute sequencing controlled via I²C - prevents pop/click artifacts during source switching in multi-zone audio systems.
DC offset protection	2 V typical offset detection during play mode - triggers shutdown before speaker damage from sustained DC bias on voice coil.
Clipping indicator	CD_OUT pin asserts logic-low when THD exceeds programmed threshold (1% or 10%) - enables real-time limiter feedback or LED status indication.

Applications

Automotive Head Unit

OEM Infotainment System

Use Scenario: Integrated 4×40 W amplifier in factory-installed car stereo with Bluetooth, navigation, and voice assistant.

IC Role / Device Role / Timing Role: Primary audio output driver with I²C-configured gain, mute timing, and speaker health monitoring - synchronized to MCU boot sequence and audio subsystem initialization.

Use Value: Eliminates discrete protection ICs and external mute controllers; reduces BOM count by 7 components while enabling automated speaker wiring verification at vehicle startup.

Use Scenario: Multi-zone audio distribution in premium sedan with front/rear seat entertainment and rear-seat display.

IC Role / Device Role / Timing Role: Quad-channel bridge amplifier with independent front/rear soft-play control - coordinated via CAN-FD gateway to synchronize audio onset with HVAC and display wake-up events.

Use Value: Enables staggered channel enable timing (≤50 ms delay between front/rear groups) to limit inrush current during system power-up, meeting OEM 10 A peak surge limits.

Aftermarket Radio Replacement

Commercial Vehicle Audio

Use Scenario: Drop-in replacement head unit for trucks and SUVs requiring robust 2 Ω load capability and thermal resilience.

IC Role / Device Role / Timing Role: High-power audio driver supporting 4 × 60 W into 2 Ω loads - thermally managed via Flexiwatt25 tab and monitored via I²C thermal register IB2.

Use Value: Delivers full rated power at ambient temperatures up to 85 °C without derating, validated for under-dash mounting in commercial fleet vehicles.

Use Scenario: Public address and intercom system in buses and coaches with emergency announcement override.

IC Role / Device Role / Timing Role: Fault-tolerant audio amplifier with automatic speaker open/short detection - integrated into PA controller firmware for pre-departure self-test.

Use Value: Reduces manual speaker continuity checks by 100%; detects broken wires or corroded connectors during daily vehicle inspection via I²C-read diagnostic flags.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7561	Lower max output (4 × 25 W @ 4 Ω), no I²C diagnostics, fixed 26 dB gain	Lacks real-time fault reporting and software-configurable mute/gain - suitable only for cost-sensitive non-diagnostic designs	Select when diagnostic features are unnecessary and thermal budget permits higher quiescent current (200 mA vs. 150 mA typ.)
STA559BW	Class D architecture, 4 × 50 W @ 4 Ω, integrated digital audio interface (I²S), no analog inputs	Requires external DAC and digital source; lacks analog input flexibility and DC offset detection	Prefer for new designs targeting >85% efficiency and digital audio processing pipelines - not drop-in compatible

Compared with TDA7561, E-TDA7566 adds I²C diagnostics and gain flexibility at modest efficiency trade-off; versus STA559BW, it retains analog input compatibility and DC fault protection essential for legacy head unit upgrades.

Availability

E-TDA7566 is available at Aetrix Electronics and suitable for automotive head units, OEM infotainment systems, aftermarket radio replacements, and commercial vehicle PA systems requiring stable component supply across extended product lifecycles.

Supply support for E-TDA7566 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 automotive-grade analog, power, and microcontroller solutions with AEC-Q100 qualified manufacturing.

E-TDA7566 belongs to ST's TDA7xxx automotive audio amplifier family, engineered specifically for high-fidelity, fault-resilient car radio applications demanding integrated diagnostics, thermal robustness, and I²C configurability.

FAQ

What is the maximum safe operating temperature for E-TDA7566?

The E-TDA7566 has a maximum junction temperature of 150 °C and a thermal resistance of 1 °C/W (junction-to-case). With proper heatsinking to maintain case temperature ≤70 °C, the device sustains full 4-channel 40 W output continuously. Derating begins above 70 °C case temperature per Figure 13 in the datasheet.

Does E-TDA7566 support 2 Ω speaker loads?

Yes - E-TDA7566 delivers up to 4 × 60 W into 2 Ω loads at 14.4 V with 10% THD, verified in Table 4 and Figure 6. It includes dedicated short-circuit protection thresholds for 2 Ω operation (Lsc = 0.5 Ω, Lnop = 1.65–45 Ω) and thermal foldback to prevent latch-up.

How does the turn-on diagnostic differ from permanent diagnostics?

Turn-on diagnostic runs once at power-up (standby exit) using a 100 ms subsonic pulse to check speaker wiring integrity before audio playback. Permanent diagnostics run continuously every 1 ms during operation to detect real-time faults like short circuits or DC offset - both report status via separate I²C registers (IB1/IB2 for turn-on, DB1–DB4 for permanent).

Can E-TDA7566 be used without I²C control?

Yes - E-TDA7566 operates in default analog mode with fixed 26 dB gain, hard mute via MUTE1/MUTE2 pins, and basic thermal/overcurrent protection. However, I²C is required to access diagnostics, soft mute/play, gain switching, and clipping threshold selection - all critical for production automotive deployment.

E-TDA7566 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 25-Flexiwatt, Formed Leads

Packaging:: Tube

Product Status:: Obsolete

Type:: Class AB

Output Type:: 4-Channel (Quad)

Max Output Power x Channels @ Load:: 60W x 4 @ 2Ohm

Voltage - Supply:: 8V ~ 18V

Features:: I2C, Mute, Short-Circuit and Thermal Protection, Standby

Mounting Type:: Through Hole

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: -

Supplier Device Package:: 25-Flexiwatt (Vertical)

E-TDA7566 FAQ

1.How can I place an order for E-TDA7566 through Aetrix?

Please submit a Request for Quotation (RFQ) for E-TDA7566 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-TDA7566 reliable?

The price and inventory of E-TDA7566 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-TDA7566 is usually 5 days.

3.What payment methods are accepted for E-TDA7566?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-TDA7566 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-TDA7566?

E-TDA7566 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-TDA7566 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-TDA7566?

For technical support, including E-TDA7566 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-TDA7566 requirements.

6.How does Aetrix verify that E-TDA7566 is sourced from the original manufacturer or authorized distributors?

All E-TDA7566 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-TDA7566 meets industry standards.

7.What is the process for return or replacement of E-TDA7566?

All E-TDA7566 units undergo pre-shipment inspection (PSI). If there is an issue with E-TDA7566, 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-TDA7566 part is unused and in its original packaging.

Return procedure for E-TDA7566:

1.Submit a request within 90 days.

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

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