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

STMicroelectronics E-TDA7409D

Name: E-TDA7409D
Brand: STMicroelectronics
SKU: E-TDA7409D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-TDA7409D

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

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

Datasheet:: E-TDA7409D.pdf

Description:: IC AUDIO SIGNAL PROCESSOR 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

E-TDA7409D from STMicroelectronics is a car radio–specific stereo audio signal processor IC featuring integrated bass/treble/LOUDNESS filters, soft-step volume control, four independent speaker outputs, and subwoofer stereo output. It supports I²C digital programming of all filter characteristics, delivers 106 dB SNR, <0.01% THD+N at 1 V_RMS, and operates from 7.5–10.5 V supply in automotive temperature range (−40 to +85 °C).

For engineers reviewing the E-TDA7409D datasheet, E-TDA7409D pinout, E-TDA7409D application, or E-TDA7409D equivalent, key selection considerations include its programmable 2nd-order bass (60/80/100/200 Hz center, Q = 1.0–2.0) and treble (10/12.5/15/17.5 kHz) filters, 100 dB volume range with zero-crossing mute, internal beep generator (781 Hz / 1.56 kHz / 1.8 kHz), and SO20 package compatibility with legacy ST car-audio designs.

Technical Context

The TDA7409 implements a fully analog BICMOS signal path with digitally programmable I²C-controlled filter coefficients, enabling real-time reconfiguration of bass, treble, loudness, and speaker-level attenuation without external components. Its AutoZero circuit eliminates DC offset before the mixing stage, reducing audible clicks during source switching.

Filter architecture uses second-order topology for both bass and treble stages, with independent center frequency (4-step selection), quality factor (4-step Q), and DC-gain (0–15 dB in 1 dB steps) control. Loudness compensation offers three programmable center frequencies (400/800/2.4 kHz) and dual-boost modes (low-only or low+high), synchronized to perceived loudness curves at low listening levels.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	7.5–10.5 V - compatible with automotive battery rail including cold-crank dips and load-dump transients
SNR	106 dB (A-weighted, 2 V_RMS output) - enables high-fidelity reproduction in noisy vehicle cabins
Bass Center Freq	60/80/100/200 Hz - selectable per application to match speaker resonance and cabin acoustics
Treble Center Freq	10/12.5/15/17.5 kHz - optimized for tweeter response tailoring and high-frequency clarity
Volume Range	100 dB (1 dB steps) with soft-step timing (0.68–5.04 ms) - eliminates click/pop during level changes
I²C Speed	500 kbit/s max - supports fast configuration updates during source transitions or UI interactions
Soft Mute Attenuation	≥80 dB with S-curve timing (0.48–170 ms options) - prevents transient thumps during mute/unmute

Pinout & Package

SO20 surface-mount package (13.0 × 7.6 mm, 1.27 mm pitch), thermally rated to 85 °C/W junction-to-pins, suitable for automotive PCB layouts with thermal relief pads.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 7 (SE1L–SE4R)	Stereo input channels	Four single-ended stereo inputs with 0–20 dB programmable gain and auto-zero offset cancellation
9, 11, 12, 13 (OUTLF–OUTRR)	Speaker outputs	Four independent speaker drivers with 50 dB attenuation range, mute, and zero-crossing control
15, 16 (SWL/SWR)	Subwoofer outputs	Stereo single-ended subwoofer outputs matching main speaker attenuator resolution and timing
17, 18 (SCL/SDA)	I²C interface	Standard bidirectional I²C bus (500 kbit/s) for full digital configuration of all audio parameters
2, 20 (MUTE/VS)	Hardware mute & supply	Active-low direct mute pin; 7.5–10.5 V supply input with internal 20 mA regulation
4, 6, 8, 10, 14, 19 (GND/VREF/CREF/MONO/FADER)	Analog reference & control	GND return; internal 4.5 V VREF bias; CREF capacitor for filter stability; mono/fader routing control

Key Features

Feature	Design Value
Programmable loudness compensation	Three center frequencies (400/800/2.4 kHz) with low- or low+high boost - matches human ear sensitivity at low volumes
Internal beep generator	Three fixed frequencies (781 Hz / 1.56 kHz / 1.8 kHz) with 250–500 mV_RMS output - eliminates need for external tone generator
4-step mixing stage	Configurable mix ratio (0/–3.5/–6/–12 dB) between main source and beep/rear input - enables hands-free call blending
AutoZero offset cancellation	Resets input-stage DC offset every time input selector register is written (<0.3 ms duration) - prevents pop on source change
SoftStep volume timing	Four user-selectable step durations (0.68/1.26/2.52/5.04 ms) - eliminates audible artifacts during volume ramping

Applications

FM/AM Radio Head Unit

CD/MP3 Source Processor

Use Scenario: Integrated audio processing in OEM or aftermarket car radios with multiple analog sources.

IC Role / Device Role / Timing Role: Central audio signal processor handling input multiplexing, equalization, loudness, and speaker-level control.

Use Value: Eliminates discrete op-amps, filters, and DACs; reduces BOM count by >12 components while enabling software-tunable EQ.

Use Scenario: Audio front-end for CD changers, USB audio, or Bluetooth A2DP receivers in vehicle infotainment systems.

IC Role / Device Role / Timing Role: Post-DAC analog conditioning stage applying source-specific EQ, volume ramping, and speaker balancing.

Use Value: Maintains consistent loudness across media types via programmable loudness curve; supports seamless source switching with AutoZero.

Hands-Free Call Integration

Subwoofer Signal Path

Use Scenario: Blending microphone audio into main audio stream during Bluetooth HFP calls.

IC Role / Device Role / Timing Role: Mixing stage combining rear-channel input (phone) with main left/right signals under I²C control.

Use Value: Enables adjustable mix ratio (–12 to 0 dB) without external summing amplifiers; preserves original source fidelity.

Use Scenario: Dedicated low-frequency enhancement path feeding active subwoofers in premium car audio systems.

IC Role / Device Role / Timing Role: Stereo subwoofer output channel with independent 50 dB attenuation and zero-crossing mute.

Use Value: Matches phase and timing of main speakers via shared SoftStep and mute timing; avoids subwoofer "thump" on power-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7313	Lower SNR (96 dB), no subwoofer outputs, fixed 100 Hz bass center only, no internal beep	Limited to basic radio processing; lacks loudness compensation and multi-source mixing	Select when cost sensitivity outweighs feature requirements and subwoofer support is unnecessary
TDA7719	Higher integration (integrated ADC/DAC), 24-bit processing, but requires external clock and has no AutoZero	Targets digital head units with DSP; not pin-compatible and demands more complex firmware	Select for new digital architectures needing higher resolution; avoid for analog-only upgrades

Compared with TDA7313 and TDA7719, E-TDA7409D uniquely balances legacy analog compatibility, comprehensive loudness/bass/treble tuning, and integrated subwoofer control-making it optimal for mid-tier automotive audio upgrades requiring minimal hardware changes.

Availability

E-TDA7409D is available at Aetrix Electronics and suitable for FM/AM radio head units, CD/MP3 source processors, hands-free call integration, and subwoofer signal path applications requiring stable component supply in automotive-grade environments.

Supply support for E-TDA7409D 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 ISO/TS 16949-certified manufacturing.

E-TDA7409D belongs to ST's legacy car audio signal processor product line, designed specifically for analog-centric automotive infotainment systems requiring high-SNR, low-distortion, and software-configurable audio conditioning without DSP overhead.

FAQ

What is the maximum operating supply voltage for E-TDA7409D?

The absolute maximum supply voltage is 10.5 V, with recommended operation between 7.5 V and 10.5 V. Exceeding 10.5 V risks permanent damage. The device includes built-in overvoltage protection and thermal shutdown, but sustained operation above 10.5 V voids warranty and may degrade long-term reliability in automotive environments.

Does E-TDA7409D support I²C clock stretching?

No, E-TDA7409D does not support I²C clock stretching. Its I²C interface is slave-only with fixed 500 kbit/s maximum speed and no hold-acknowledge capability. Host controllers must adhere to strict timing windows during write cycles, especially during AutoZero-triggering register writes (e.g., Input Selector byte), where delays longer than 100 µs may cause missed initialization.

Can the internal beep generator be disabled independently of other functions?

Yes-the internal beep generator is controlled by bit D0 in the "Others" subaddress (0x0B). Setting this bit to '0' disables beep output while preserving all other functions including mixing, loudness, and volume control. Beep remains isolated from audio paths; disabling it introduces no latency or signal path disruption.

How is zero-crossing detection implemented for mute and volume steps?

Zero-crossing detection uses an internal comparator monitoring output differential swing against a ±20 mV threshold. When enabled (via SoftStep or SoftMute registers), muting or attenuation occurs only when the signal crosses near 0 V, minimizing transient energy. Detection is per-channel and synchronized across all four speaker outputs and subwoofer paths to ensure phase-coherent silence.

E-TDA7409D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

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

E-TDA7409D FAQ

1.How can I place an order for E-TDA7409D through Aetrix?

Please submit a Request for Quotation (RFQ) for E-TDA7409D 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-TDA7409D reliable?

The price and inventory of E-TDA7409D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-TDA7409D is usually 5 days.

3.What payment methods are accepted for E-TDA7409D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-TDA7409D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-TDA7409D?

E-TDA7409D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-TDA7409D 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-TDA7409D?

For technical support, including E-TDA7409D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-TDA7409D requirements.

6.How does Aetrix verify that E-TDA7409D is sourced from the original manufacturer or authorized distributors?

All E-TDA7409D 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-TDA7409D meets industry standards.

7.What is the process for return or replacement of E-TDA7409D?

All E-TDA7409D units undergo pre-shipment inspection (PSI). If there is an issue with E-TDA7409D, 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-TDA7409D part is unused and in its original packaging.

Return procedure for E-TDA7409D:

1.Submit a request within 90 days.

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

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