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

STMicroelectronics TDA7429S

Name: TDA7429S
Brand: STMicroelectronics
SKU: TDA7429S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7429S

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

Package:: 42-SDIP (0.600", 15.24mm)

Datasheet:: TDA7429S.pdf

Description:: IC AUDIO TONE PROCESSOR 42SDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TDA7429S from STMicroelectronics is a digitally controlled audio processor IC for stereo and surround-sound signal conditioning in TV and Hi-Fi systems. It provides programmable bass/middle/treble tone control (±14 dB, 2 dB steps), 3 stereo inputs, 4 independent speaker attenuators (0–79 dB, 1 dB steps), and three surround modes (Music, Movie, Simulated) via I²C interface. It operates from 7–10.2 V supply and delivers <0.1% THD at 1 Vrms input.

For engineers reviewing the TDA7429S datasheet, TDA7429S pinout, TDA7429S application, or TDA7429S equivalent, this device serves as a fully integrated analog audio signal processor with digital configuration-ideal for volume, tone, balance, surround matrix, and speaker-level management in cost-sensitive consumer audio platforms requiring serial bus control and low-noise performance.

Technical Context

The TDA7429S implements a programmable analog signal path using bipolar/CMOS technology, combining resistor networks, operational amplifiers, and digitally controlled analog switches to achieve precise DC-coupled gain/attenuation without stepping artifacts. Its surround matrix uses four configurable phase shifters (RPS1–RPS4) with 16 selectable impedance values per shifter to generate spatial effects.

All functions-including input selection, tone controls, speaker attenuation, mute, and surround mode-are configured via a standard I²C bus (SDA/SCL) operating at up to 400 kHz, supporting both incremental and non-incremental write protocols with 8-bit subaddressing across 10 functional registers.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	7–10.2 V - Supports standard 9 V rail; 10.2 V max ensures headroom for transient peaks
THD+N	0.01–0.1 % - Measured at 1 kHz, 1 Vrms; enables high-fidelity output without audible distortion
Signal-to-Noise Ratio	106 dB - Achieved with mute off and flat response; critical for quiet background audio reproduction
Tone Control Range	±14 dB (bass/middle/treble) - 2 dB step resolution allows precise tonal shaping per band
Speaker Attenuation	0–79 dB (L/R/rear/aux) - 1 dB step resolution supports fine-grained channel balancing and level matching
I²C Interface	Standard-mode (100 kHz) & fast-mode (400 kHz) - Enables real-time configuration without CPU overhead
Channel Separation	90 dB - Ensures minimal crosstalk between left/right paths at 1 kHz for accurate stereo imaging

Pinout & Package

Package: SDIP42 (42-pin shrink dual in-line package, 0.600" width, 0.100" pitch).

Pin/Terminal	Circuit Role	Design Meaning
AUXOUT_L	Left auxiliary output	Post-processed signal for external recording or secondary zone; DC-coupled, 50 Ω output impedance
AUXOUT_R	Right auxiliary output	Independent right-channel auxiliary output with identical electrical specs to AUXOUT_L
L_IN1–L_IN4	Left input channels	Four differential-capable left inputs; selected via I²C-controlled multiplexer (IN1–IN4)
R_IN1–R_IN4	Right input channels	Corresponding right inputs synchronized with L_INx; supports source switching without signal interruption
L_OUT / R_OUT	Main left/right outputs	Primary amplified outputs driving speakers directly; 25–85 Ω output resistance, ±2.5 Vrms clipping
MONITOR_L / MONITOR_R	Monitor outputs	Dedicated buffered outputs for diagnostics or headphone amp stage; 4.5 V DC bias, 0.1 % THD
REARIN / REAROUT	Rear channel interface	Enables 4-channel surround; REARIN accepts rear signal, REAROUT delivers processed rear output
VAR_L / VAR_R	Volume control reference	Analog voltage inputs (2.2 µF coupling) setting master left/right attenuation via internal 30 kΩ potentiometer emulation
BASS_LI / BASS_LO	Left bass input/output	Direct access to bass band signal path; allows external EQ or feedback loop insertion
MIDDLE_LI / MIDDLE_LO	Left midrange input/output	Mid-band signal tap point; supports parallel processing or external midrange enhancement
TREBLE_L / TREBLE_R	Treble band outputs	High-frequency band outputs; 5.6 nF coupling, 79 dB control range, optimized for tweeter drive
SCL / SDA	I²C serial interface	Open-drain bidirectional bus lines; require external 2.2–10 kΩ pull-up resistors to VS
PS1–PS4	Phase shifter programming	Resistor network pins configuring surround matrix phase shifts (90 Hz, 400 Hz, 4 kHz, 400 Hz bands)
LP / LP1 / HP1 / HP2	Filter network terminals	External passive filter nodes for low-pass (LP/LP1) and high-pass (HP1/HP2) tuning of tone stages
CREF	Reference capacitor node	Connects 100 nF capacitor to stabilize internal bias; critical for DC offset control and noise immunity
DIG_GND / AGND	Digital/analog ground	Separate ground returns minimize digital switching noise coupling into analog signal paths

Key Features

Feature	Design Value
Three surround sound modes	Music (4 fixed responses), Movie (256 programmable), Simulated (256)-enables OEM differentiation without hardware change
Independent speaker mute	Dedicated mute per channel (L/R/rear/aux); achieves >100 dB attenuation without pop/click
Input attenuation control	0–31.5 dB range in 0.5 dB steps; supports dynamic range compression and input level normalization
DC-coupled signal path	No coupling capacitors required in main path; eliminates low-frequency phase shift and size/cost of large electrolytics
Low-noise bipolar/CMOS process	Combines precision analog performance (106 dB SNR) with digital configurability and low power (10–26 mA)

Applications

Home Theater AV Receiver

Smart TV Audio Processor

Use Scenario: Integrated surround decoding and speaker management in compact AV receivers with ≤5.1 channel support.

IC Role / Device Role / Timing Role: Central audio signal conditioner handling input switching, tone correction, surround matrix generation, and speaker-level attenuation.

Use Value: Replaces discrete op-amp + switch + potentiometer designs; reduces BOM count by >12 components while enabling firmware-upgradable audio profiles.

Use Scenario: Main audio processor in 4K UHD smart TVs requiring HDMI ARC-compatible analog output and virtual surround enhancement.

IC Role / Device Role / Timing Role: Real-time tone/surround processing of decoded PCM streams before DAC conversion and speaker driver stage.

Use Value: Delivers 90 dB channel separation and <0.1% THD at full volume-meeting broadcast loudness standards (EBU R128) without external calibration.

Hi-Fi Stereo Amplifier

Audio Distribution System

Use Scenario: High-fidelity stereo preamplifier with remote-controllable tone, balance, and input selection for audiophile-grade systems.

IC Role / Device Role / Timing Role: Analog front-end processor managing volume, bass/middle/treble, left/right balance, and mute-all via IR or Bluetooth MCU interface.

Use Value: Provides 106 dB SNR and DC-coupled outputs-eliminating infrasonic roll-off and preserving sub-20 Hz extension for full-range speaker systems.

Use Scenario: Multi-zone audio controller distributing synchronized stereo signals to 4 independent rooms with independent level/tone control.

IC Role / Device Role / Timing Role: Zone-specific signal conditioner receiving shared digital audio and applying per-zone attenuation, tone, and mute via I²C daisy-chain.

Use Value: Enables simultaneous control of 4 zones using single I²C bus; 79 dB speaker attenuation range supports 20+ dB inter-zone level isolation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7429T	TQFP44 package (10×10 mm), same electrical specs and register map; differs only in pinout and thermal resistance (85 °C/W vs SDIP42's higher R_th)	Preferred for space-constrained PCB layouts; requires rework of decoupling and filter component placement	Select when board area is limited and thermal management via heatsink or airflow is feasible.
CS4272-CZZ	24-bit stereo DAC + DSP (not analog processor); lacks surround matrix, speaker attenuation, and analog tone controls; requires external op-amps	Used in digital-first architectures where audio is processed in FPGA/DSP before conversion; no analog signal path flexibility	Choose only if system already includes high-performance digital audio processing and needs DAC integration-not as drop-in replacement.

Compared with TDA7429T, the TDA7429S offers identical functionality in SDIP42 for through-hole or legacy wave-solder assembly, while CS4272-CZZ represents a fundamentally different architecture-requiring full signal chain redesign and forfeiting analog tone/surround capabilities.

Availability

TDA7429S is available at Aetrix Electronics and suitable for home theater receivers, smart TV audio subsystems, Hi-Fi preamplifiers, and multi-zone audio distribution systems requiring stable component supply and long-term production continuity.

Supply support for TDA7429S 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, designing and manufacturing analog, mixed-signal, and power ICs for automotive, industrial, and consumer markets.

The TDA7429S belongs to ST's legacy audio processor family targeting cost-optimized consumer audio equipment, emphasizing analog fidelity, serial configurability, and minimal external component count for TV and stereo applications.

FAQ

What is the maximum input signal level the TDA7429S can handle without clipping?

The TDA7429S supports up to 2.5 Vrms input signal level (V_CL) at 0.3% THD, verified per Table 5 test conditions. This corresponds to ~7.1 V_PP peak-to-peak for sine waves. Exceeding this causes hard clipping; design margin should include 3–6 dB headroom for transients.

Does the TDA7429S require external clocking for I²C operation?

No external clock is required-the TDA7429S uses its internal oscillator for I²C timing. The SCL line is driven solely by the master device (e.g., MCU), and the TDA7429S synchronizes to incoming SCL edges. Pull-up resistors on SDA/SCL (2.2–10 kΩ to VS) are mandatory.

Can the surround modes be customized beyond the 256 predefined responses?

No-Music mode offers only 4 factory-programmed responses, while Movie and Simulated modes each provide exactly 256 fixed phase-shifter configurations (via PS1–PS4 resistor selections). No user-defined coefficients or firmware upload capability exists; all settings are selected via I²C register writes.

How is DC offset managed at the L_OUT/R_OUT pins?

DC offset is minimized via internal biasing referenced to CREF (100 nF capacitor node) and matched transistor pairs in the bipolar/CMOS process. Typical output DC voltage is 3.8 V (L_OUT) and 4.5 V (MONITOR outputs), with <3 mV variation between adjacent attenuation steps-ensuring no audible thump during volume changes.

TDA7429S Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 42-SDIP (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Function:: Audio Tone Processor

Applications:: Consumer Audio

Number of Channels:: 2

Interface:: I2C

Voltage - Supply:: 7V ~ 10.2V

Operating Temperature:: 0°C ~ 70°C (TA)

Specifications:: 0.5dB

Mounting Type:: Through Hole

Grade:: -

TDA7429S FAQ

1.How can I place an order for TDA7429S through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7429S 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 TDA7429S reliable?

The price and inventory of TDA7429S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7429S is usually 5 days.

3.What payment methods are accepted for TDA7429S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7429S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7429S?

TDA7429S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7429S 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 TDA7429S?

For technical support, including TDA7429S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7429S requirements.

6.How does Aetrix verify that TDA7429S is sourced from the original manufacturer or authorized distributors?

All TDA7429S 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 TDA7429S meets industry standards.

7.What is the process for return or replacement of TDA7429S?

All TDA7429S units undergo pre-shipment inspection (PSI). If there is an issue with TDA7429S, 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 TDA7429S part is unused and in its original packaging.

Return procedure for TDA7429S:

1.Submit a request within 90 days.

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

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