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Home > Products > Integrated Circuits (ICs) > Audio Special Purpose

STMicroelectronics TDA7409DTR

Name: TDA7409DTR
Brand: STMicroelectronics
SKU: TDA7409DTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7409DTR

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: TDA7409DTR.pdf

Description:: IC AUDIO SIGNAL PROCESSOR 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TDA7409DTR from STMicroelectronics is a car radio–specific stereo audio signal processor with integrated I²C-controlled bass/treble/LOUDNESS filters, soft-step volume, four independent speaker attenuators, subwoofer stereo output, and internal beep generator. It supports 4 single-ended stereo inputs, offers 100 dB volume range with zero-crossing mute, and delivers <0.01% THD+N at 1 VRMS output in automotive infotainment systems.

For engineers reviewing the TDA7409DTR datasheet, TDA7409DTR pinout, TDA7409DTR application, or TDA7409DTR equivalent, key selection criteria include programmable 2nd-order bass (60–200 Hz, Q=1.0–2.0) and treble (10–17.5 kHz) filters, 4-step soft-mute timing (0.48–170 ms), I²C bus interface up to 500 kbit/s, and SO20 package compatibility with automotive thermal requirements (−40°C to +85°C).

Technical Context

The TDA7409DTR implements a BICMOS-based analog signal path with AutoZero offset cancellation before the mixing stage, eliminating DC drift from input gain stages without external AC coupling. Its digital control architecture uses an 8-bit I²C interface with subaddressing to configure 11 functional blocks-including input multiplexer, loudness, volume, bass, treble, speaker/subwoofer attenuators, and soft-mute-via dedicated data bytes.

All filter sections (bass, treble, loudness) are fully programmable 2nd-order responses with independent center frequency, Q factor, and gain settings; bass supports DC-mode for shifted f_C and Q; loudness offers flat, low-boost, or low+high-boost shapes; and soft-step volume uses four selectable switch times (0.68–5.04 ms) to suppress click artifacts during level changes.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	7.5–10.5 V - compatible with automotive battery rail (9 V nominal); supports cold-crank down to 7.5 V.
THD+N	0.005% typ. - ultra-low distortion ensures high-fidelity audio reproduction in OEM head units.
Signal-to-Noise Ratio	106 dB (A-weighted, 2 VRMS) - enables wide dynamic range for premium audio processing.
I²C Bus Speed	Up to 500 kbit/s - allows fast configuration updates during source switching or user interaction.
Bass Center Frequency	60 / 80 / 100 / 200 Hz - discrete selection enables precise tailoring to vehicle cabin acoustics.
Soft-Mute Attenuation	80–100 dB - full muting without residual leakage, critical for hands-free call transitions.
Speaker Attenuation Range	−53 dB to +50 dB - fine 1 dB steps support balanced multi-zone speaker tuning.
Operating Temperature	−40°C to +85°C - qualified for under-dash automotive environments per AEC-Q100 Class 3.

Pinout & Package

Package: SO20 (Small Outline, 20-pin, 0.65 mm pitch), JEDEC MS-013AC, thermal resistance R_{th j-pins} = 85 °C/W - suitable for convection-cooled automotive PCB layouts without heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
1 (SE1L)	Stereo Input Left Channel 1	Single-ended analog input for primary audio source (e.g., FM tuner left).
2 (SE1R)	Stereo Input Right Channel 1	Single-ended analog input paired with SE1L; supports 100 kΩ input impedance.
3 (SE2L)	Stereo Input Left Channel 2	Secondary input for AM tuner or auxiliary left channel; shares same gain/selector logic.
4 (SE2R)	Stereo Input Right Channel 2	Paired right input for SE2L; enables seamless source switching via I²C.
5 (SE3L)	Stereo Input Left Channel 3	Third input for CD player or Bluetooth left; configurable gain from −1 dB to +20 dB.
6 (SE3R)	Stereo Input Right Channel 3	Right counterpart to SE3L; supports auto-zero calibration on input change.
7 (SE4L)	Stereo Input Left Channel 4	Fourth input for navigation voice or rear-seat entertainment left channel.
8 (SE4R)	Stereo Input Right Channel 4	Right counterpart to SE4L; all four inputs share common I²C-selectable gain.
9 (GND)	Analog Ground Reference	Common return for all analog signal paths; must be star-connected to minimize crosstalk.
10 (SCL)	I²C Clock Input	Open-drain input synchronized to master clock; supports 500 kbit/s max for real-time control.
11 (SDA)	I²C Data Input/Output	Bi-directional open-drain line; requires external pull-up; handles subaddress/data byte protocol.
12 (SWR)	Subwoofer Right Output	Single-ended buffered output; programmable attenuation (−53 dB to +50 dB) and mute.
13 (SWL)	Subwoofer Left Output	Independent left subwoofer output; identical attenuation/mute control as SWR.
14 (OUTRR)	Rear Right Speaker Output	Dedicated output with 1 dB step attenuator; zero-crossing mute prevents pop noise.
15 (OUTLR)	Rear Left Speaker Output	Paired rear output; supports independent fader balance and loudness compensation.
16 (OUTRF)	Front Right Speaker Output	High-drive output (2 kΩ load, 30–100 Ω Z_OUT) for front-stage amplification.
17 (OUTLF)	Front Left Speaker Output	Primary front output; clips at 2.6 VRMS (d = 0.3%) for clean headroom.
18 (MUTE)	Hardware Mute Control	Active-low digital input; triggers immediate mute or initiates soft-mute sequence.
19 (VS)	Power Supply Input	9 V nominal supply; internal regulation powers analog/digital blocks; ESD-protected per MIL-STD-883.
20 (CREF)	Reference Capacitor Terminal	Connects 100 nF capacitor to stabilize internal voltage reference for ADC/DAC accuracy.

Key Features

Feature	Design Value
AutoZero Offset Cancellation	0.5 mV residual offset; eliminates DC drift without external coupling caps, reducing BOM cost and board space.
Programmable Loudness Curve	Three center frequencies (400/800/2.4 kHz) + low/high boost modes - adapts perceived loudness across cabin volumes and frequencies.
Four-Step Soft-Mute Timing	Selectable delays (0.48/0.96/30.7/123 ms) - matches human auditory masking for seamless call handover or source fade.
Internal Beep Generator	Three fixed tones (781 Hz, 1.56 kHz, 1.8 kHz) - provides UI feedback without external oscillator or MCU GPIO overhead.
Zero-Crossing Volume Switching	Four soft-step times (0.68–5.04 ms) - suppresses transient clicks during volume changes, critical for premium UX.
Dedicated Subwoofer Stereo Path	Independent left/right attenuators with 50 dB range - enables precise bass management for dual-sub configurations.

Applications

OEM Automotive Head Unit

Aftermarket Car Stereo

Use Scenario: Integrated infotainment system in mid-tier passenger vehicles with FM/AM/CD/Bluetooth sources and 4-zone speaker layout.

IC Role / Device Role / Timing Role: Central audio processor handling input routing, tone correction, loudness compensation, and speaker-level attenuation before power amp stage.

Use Value: Enables factory-tuned acoustic profiles via I²C-programmable filters and fader/mixer controls, reducing calibration time and test iterations.

Use Scenario: Compact plug-and-play stereo replacement unit supporting multiple aux inputs and subwoofer output.

IC Role / Device Role / Timing Role: Audio signal conditioner providing soft-mute for hands-free calls, beep feedback for button presses, and bass/treble tuning.

Use Value: Eliminates need for external DSP or microcontroller by integrating tone control, mixing, and mute sequencing in one SO20 IC.

Commercial Vehicle Infotainment

Marine Audio System

Use Scenario: Ruggedized cab audio system in trucks/buses with extended temperature operation and vibration resilience.

IC Role / Device Role / Timing Role: High-reliability audio front-end with ESD-hardened pins, −40°C to +85°C operation, and stable AutoZero under electrical noise.

Use Value: Maintains consistent audio fidelity despite alternator ripple (SVRR = 60 dB) and wide supply variation (7.5–10.5 V).

Use Scenario: Waterproof marine stereo with corrosion-resistant PCB layout and subwoofer integration for deck speakers.

IC Role / Device Role / Timing Role: Signal processor delivering waterproof-grade loudness compensation and independent subwoofer attenuation.

Use Value: Supports salt-humidity–robust design via SO20 package and internal reference stability (CREF capacitor decoupling).

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo audio processor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7413DTR	Successor IC with enhanced I²C address flexibility, lower THD (0.003%), and extended loudness f_C range (200–3.2 kHz); same SO20 footprint.	Supports newer automotive platforms requiring wider loudness adaptation and faster I²C response.	Choose for new designs needing improved SNR and broader loudness tuning; pin-compatible but requires firmware update for subaddress mapping.
STA559BW	Digital-input (I²S) Class-D amplifier with integrated DSP; lacks analog inputs and soft-step volume; higher integration but no subwoofer stereo output.	Targeted at digital-source–only systems (e.g., Android Auto) where analog input multiplexing is unnecessary.	Prefer when migrating to all-digital audio architecture; not drop-in due to missing analog input stage and different control interface.

Compared with TDA7409DTR, TDA7413DTR offers superior audio fidelity and expanded loudness tuning while maintaining mechanical and electrical compatibility, whereas STA559BW shifts to digital-domain processing and eliminates analog input flexibility-making it unsuitable for legacy analog-source upgrades.

Availability

TDA7409DTR is available at Aetrix Electronics and suitable for OEM automotive head units, aftermarket stereo replacements, commercial vehicle infotainment, and marine audio systems requiring stable component supply across extended lifecycle demands.

Supply support for TDA7409DTR 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 over 40 years of analog signal processing expertise.

The TDA7409DTR belongs to ST's legacy car radio audio processor family, designed specifically to replace discrete op-amp/filter solutions with a single-chip, I²C-configurable analog signal path optimized for cost-sensitive, high-reliability automotive audio.

FAQ

What is the maximum allowable supply voltage for TDA7409DTR?

The absolute maximum supply voltage is 10.5 V, with recommended operating range 7.5–10.5 V. Exceeding 10.5 V risks permanent damage to internal BICMOS circuitry. The device includes built-in overvoltage protection and ESD hardening per MIL-STD-883, but sustained operation above 10.5 V voids reliability guarantees and may degrade long-term performance.

Does TDA7409DTR support simultaneous bass and treble adjustment?

Yes - bass and treble filters operate independently and concurrently. Each has its own dedicated I²C subaddress (0x04 for bass, 0x05 for treble), allowing real-time co-adjustment without interference. Both use 2nd-order topology with programmable center frequency, Q factor, and gain; bass supports DC-mode for shifted response, while treble offers four center frequencies from 10 kHz to 17.5 kHz.

How does the AutoZero function interact with I²C programming?

AutoZero activates automatically upon loading Data Byte 0 (Input Selector/Gain), taking ≤0.3 ms to cancel input-stage offsets. To prevent unintended muting during background I²C updates, the AutoZero-Remain mode (I² bit in subaddress byte) holds the last calibration value - enabling register writes without re-triggering offset cancellation or output muting.

Can TDA7409DTR drive headphones directly?

No - TDA7409DTR outputs are line-level (2.6 VRMS clipping, 30–100 Ω Z_OUT) intended for connection to external power amplifiers or active speakers. Its speaker outputs lack headphone-specific current drive capability, short-circuit protection, or DC-blocking capacitors. Direct headphone connection would result in insufficient volume, potential distortion, and risk of damaging sensitive earpieces.

TDA7409DTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Audio Signal Processor

Applications:: Audio

Number of Channels:: 2

Interface:: I2C

Voltage - Supply:: 7.5V ~ 10.5V

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

Specifications:: -

Mounting Type:: Surface Mount

Grade:: Automotive

TDA7409DTR FAQ

1.How can I place an order for TDA7409DTR through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7409DTR 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 TDA7409DTR reliable?

The price and inventory of TDA7409DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7409DTR is usually 5 days.

3.What payment methods are accepted for TDA7409DTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7409DTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7409DTR?

TDA7409DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7409DTR 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 TDA7409DTR?

For technical support, including TDA7409DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7409DTR requirements.

6.How does Aetrix verify that TDA7409DTR is sourced from the original manufacturer or authorized distributors?

All TDA7409DTR 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 TDA7409DTR meets industry standards.

7.What is the process for return or replacement of TDA7409DTR?

All TDA7409DTR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7409DTR, 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 TDA7409DTR part is unused and in its original packaging.

Return procedure for TDA7409DTR:

1.Submit a request within 90 days.

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

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