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

STMicroelectronics TDA7561

Name: TDA7561
Brand: STMicroelectronics
SKU: TDA7561
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7561

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: TDA7561.pdf

Description:: IC AMP AB QUAD 60W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:336

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Product details

Overview

TDA7561 from STMicroelectronics is a quad-channel Class-AB bridge-tied-load (BTL) audio power amplifier in Flexiwatt25 package, designed for automotive head unit applications. It delivers 4 × 25 W into 4 Ω at 14.4 V/1 kHz/10% THD, supports I²C-controlled soft mute/play and gain selection (12 dB or 26 dB), and integrates real-time diagnostics for speaker fault detection including short-to-GND, short-to-V_S, open load, and DC offset.

For engineers reviewing the TDA7561 datasheet, TDA7561 pinout, TDA7561 application, or TDA7561 equivalent, this page provides verified functional context, validated pin roles, confirmed diagnostic behavior under I²C control, and precise thermal/power specifications for automotive audio system integration and fault-resilient design.

Technical Context

The TDA7561 implements a DMOS-based BTL output stage using Multipower BCD technology, enabling high efficiency and low distortion (<0.04% THD at 1 W–10 W). Its dual-mode operation-standard power amplifier mode and low-noise line-driver mode (12 dB gain)-is selected via I²C register configuration.

Diagnostics operate across three phases: turn-on pulse-based detection (inaudible subsonic test), permanent monitoring (1 ms sampling interval), and DC offset sensing (±2 V threshold). All fault states-including four independent short-circuit protections and clipping detection-are reported over the same I²C bus used for configuration.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 25 W @ 4 Ω, 14.4 V, 1 kHz, 10% THD - sufficient for full-range front/rear speaker drive in compact car radios
Max Output Power	4 × 60 W @ 2 Ω - enables high-SPL transient capability with 2 Ω stable operation
THD+N	0.02% typ. @ 12 dB gain, 0.1–5 V_RMS - ensures low-noise line-out functionality when configured as preamp driver
I²C Interface	Standard-mode (≤400 kHz), with dedicated diagnostics readback registers - allows microcontroller to poll per-channel fault status without interrupt overhead
Thermal Resistance	R_th(j-case) = 1 °C/W - mandates direct mechanical mounting to heatsink for sustained 85 W dissipation at T_case = 70 °C
Fault Detection	Turn-on diagnostic acquisition time = 100 ms typ.; permanent diagnostics sample every 1 ms - balances speed and acoustic transparency during startup and runtime
DC Offset Protection	Detects ±2 V output offset during play mode - prevents speaker damage from amplifier latch-up or bias failure

Pinout & Package

Package: Flexiwatt25 (vertical orientation), 25-pin single-in-line (SIL) thermally enhanced power package with exposed metal backside for heatsink attachment.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Power supply input	Primary 8–18 V DC rail; must be decoupled near pin with ≥1000 µF low-ESR capacitor for transient current demands
OUT1–OUT4	Bridge-tied-load outputs	Four independent BTL channels; each drives one speaker without external coupling capacitors
IN1–IN4	Differential input pairs	High-impedance (80–130 kΩ) inputs accepting line-level or preamp signals; support single-ended or differential drive
SCL / SDA	I²C serial interface	Enable full remote configuration: standby/mute control, gain selection, diagnostics enable, and fault register readback
SVR	Supply voltage rejection monitor	Internal node used during turn-on diagnostic to detect abnormal output impedance; not user-accessible
CLK / DATA	Legacy control interface (unused in standard config)	Deprecated parallel control pins; functional only if I²C disabled - not recommended for new designs

Key Features

Feature	Design Value
I²C-configurable gain	Switches between 12 dB (low-noise line output) and 26 dB (full-power speaker drive) - eliminates need for external gain-setting resistors
Per-channel diagnostics	Reports short-to-GND, short-to-V_S, open load, and short-across-speaker faults individually - enables targeted channel shutdown without muting entire system
Turn-on diagnostic pulse	Inaudible 100 ms subsonic test applied before amplifier biasing - prevents audible pop and verifies speaker integrity prior to playback
DC offset detection	Monitors output DC voltage during active play; flags >±2 V deviation - protects speakers from thermal damage due to amplifier DC fault
Independent soft mute/play	Front/rear channel groups controlled separately via I²C - supports fade effects and zone-specific audio routing in multi-zone head units

Applications

Automotive Head Unit

Multi-Zone Infotainment System

Use Scenario: Integrated AM/FM/DAB/Bluetooth receiver with 4-speaker cabin output.

IC Role / Device Role / Timing Role: Primary audio power driver delivering full-bandwidth analog amplification with embedded diagnostics for OEM compliance.

Use Value: Eliminates need for discrete fault-sensing circuitry; reduces BOM count by integrating protection logic and I²C telemetry in single quad amplifier.

Use Scenario: Front-seat entertainment system with rear-seat headphone jacks and independent volume control.

IC Role / Device Role / Timing Role: Dual-role device: BTL amplifier for front speakers + line-driver (12 dB gain) for rear headphone outputs.

Use Value: Single IC satisfies both high-power and low-noise analog signal chain requirements, reducing PCB area and inter-stage noise coupling.

Aftermarket Car Stereo

Diagnostic-Enabled Audio Module

Use Scenario: Compact DIN-sized stereo with Bluetooth streaming and USB playback.

IC Role / Device Role / Timing Role: Quad-channel output stage with I²C-managed soft-start and channel muting for clean UI transitions.

Use Value: Enables silent boot and seamless source switching via programmable mute timing (20–40 ms turn-on/off delay).

Use Scenario: Serviceable audio module with field-replaceable amplifier section and fault logging capability.

IC Role / Device Role / Timing Role: Diagnostics hub reporting real-time speaker health over CAN/I²C gateway to vehicle telematics unit.

Use Value: Provides actionable fault codes (e.g., "OUT3 short-to-GND") for predictive maintenance and warranty analytics without external ADC or logic.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7388	4 × 41 W @ 4 Ω, no integrated I²C diagnostics; uses analog control pins for mute/standby	Lacks per-channel fault reporting and turn-on diagnostic pulse - requires external monitoring circuitry for speaker integrity checks	Select when cost sensitivity outweighs diagnostic requirement and system MCU lacks I²C resources
STA559BW	4 × 70 W @ 2 Ω, digital input (I²S), integrated DSP, but no analog input or BTL diagnostics	Designed for digital-source systems only; no analog INx pins or DC offset detection - incompatible with legacy head unit signal chains	Select for new digital-audio architectures where DSP features (EQ, crossover) justify migration from analog signal path

Compared with TDA7388, TDA7561 adds I²C-based diagnostics and configurable gain without increasing footprint; compared with STA559BW, it retains full analog compatibility and speaker-protection intelligence at lower peak power, making it optimal for cost-constrained, diagnostics-required automotive analog audio platforms.

Availability

TDA7561 is available at Aetrix Electronics and suitable for automotive head units, infotainment control modules, and aftermarket stereo systems requiring stable component supply, long-lifecycle support, and production-grade thermal reliability.

Supply support for TDA7561 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, industrial, and power management ICs with vertical manufacturing capability.

The TDA7561 belongs to ST's TDA7xxx automotive audio amplifier family, engineered specifically for EMI-robust, thermally efficient, and diagnostics-rich car radio implementations where speaker protection and software-controllable audio routing are mandatory.

FAQ

What is the maximum safe operating supply voltage for TDA7561?

The absolute maximum DC supply voltage (V_S) is 28 V, but continuous operation above 18 V is not recommended. The device is rated for 8–18 V nominal operation; exceeding 18 V risks thermal runaway under load and violates the specified electrical characteristics. Peak transients up to 50 V are allowed only for ≤50 ms per ISO 7637-2 Pulse 1/2b testing.

Can TDA7561 drive 1 Ω loads?

No - the TDA7561 is characterized and protected for stable operation down to 2 Ω. Driving 1 Ω loads exceeds its short-circuit current rating (6 A repetitive, 8 A non-repetitive) and thermal limits, triggering immediate shutdown. ST specifies minimum load as 2 Ω for all channels; use of lower impedances voids warranty and risks permanent damage.

How does the turn-on diagnostic avoid audible artifacts?

The turn-on diagnostic applies a subsonic (≤20 Hz), low-amplitude current pulse for 100 ms while outputs remain in high-impedance standby - no audio signal is present. The pulse magnitude and duration are calibrated to stay below human hearing threshold and speaker excursion limits, ensuring zero audible pop or thump during system startup.

Is the I²C address fixed or configurable?

The TDA7561 has a fixed 7-bit I²C slave address of 0x2C (write) / 0x2D (read); no hardware address pins or software-configurable address bits exist. Multiple devices on the same bus require external multiplexing (e.g., PCA9548A) or sequential addressing via enable pin sequencing - not supported natively.

TDA7561 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 25-Flexiwatt, Formed Leads

Packaging:: Tube

Product Status:: Active

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:: -

Qualification:: -

Supplier Device Package:: 25-Flexiwatt (Vertical)

TDA7561 FAQ

1.How can I place an order for TDA7561 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7561 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 TDA7561 reliable?

The price and inventory of TDA7561 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7561 is usually 5 days.

3.What payment methods are accepted for TDA7561?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7561 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7561?

TDA7561 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7561 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 TDA7561?

For technical support, including TDA7561 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7561 requirements.

6.How does Aetrix verify that TDA7561 is sourced from the original manufacturer or authorized distributors?

All TDA7561 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 TDA7561 meets industry standards.

7.What is the process for return or replacement of TDA7561?

All TDA7561 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7561, 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 TDA7561 part is unused and in its original packaging.

Return procedure for TDA7561:

1.Submit a request within 90 days.

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

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