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

STMicroelectronics TDA7303

Name: TDA7303
Brand: STMicroelectronics
SKU: TDA7303
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7303

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: TDA7303.pdf

Description:: IC AUDIO TONE PROCESSOR 28SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,425

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Product details

Overview

TDA7303 from STMicroelectronics is a digital-controlled stereo audio processor IC designed for volume, tone (bass/treble), balance (L/R), and fader (front/rear) processing in automotive and portable audio systems. It features 3 stereo inputs with selectable gain (0–11.25 dB in 3.75 dB steps), 1.25 dB-step volume control (−78.75 to 0 dB), independent 4-channel speaker attenuation, loudness compensation, and I²C serial interface operation at up to 400 kbit/s.

For engineers reviewing the TDA7303 datasheet, TDA7303 pinout, TDA7303 application, or TDA7303 equivalent, this device serves as a fully programmable analog signal path conditioner-enabling precise gain staging, dynamic loudness correction, and channel-specific attenuation without external microcontroller GPIO overhead.

Technical Context

The TDA7303 integrates bipolar/CMOS process technology to achieve low distortion (0.01% THD at 1 kHz, 1 Vrms), high signal-to-noise ratio (106 dB), and low DC stepping. Its analog signal path uses resistor networks and op-amps under digital control, with all functions-including input selection, gain, volume, bass/treble, and speaker-level fader-configured via I²C subaddressed registers.

It implements four independent speaker attenuators (LF/RF/LR/RR) with mute capability (100 dB attenuation), loudness function tied to volume setting and external capacitor (C_CLOUD = 100 nF), and tone controls offering ±14 dB boost/cut in 2 dB steps with externally adjustable center frequency and Q via feedback resistors and capacitors.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	6–10 V - Supports standard automotive battery range (9 V nominal) with 8–11 mA quiescent current.
Volume Control Range	−78.75 to 0 dB in 1.25 dB steps - Enables fine-grained attenuation matching human loudness perception across listening levels.
Bass/Treble Control	±14 dB in 2 dB steps - Programmable first-order shelving filters with external RC network defining center frequency and slope.
Speaker Attenuation	0–40 dB per channel in 1.25 dB steps + mute - Allows independent front/rear and left/right fader/balance without analog potentiometers.
I²C Interface Speed	Up to 400 kbit/s - Compatible with standard-mode I²C controllers; supports subaddressed register writes for multi-function configuration.
Total Harmonic Distortion	0.01% at 1 kHz, 1 Vrms - Ensures clean audio output even at full-scale signal handling (2.5 Vrms clipping).
Input Gain Selection	0, 3.75, 7.5, or 11.25 dB per input - Optimizes SNR when interfacing with line-level (2 Vrms) or low-output (250 mV) sources like Bluetooth modules or DACs.

Pinout & Package

Package: SO-28 (Small Outline, 28-pin, 300 mil width), ECOPACK® compliant, with thermal resistance R_{th j-pins} = 85 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 13–15	Stereo Input Channels (L1/R1, L2/R2, L3/R3)	Three differential-capacitor-coupled stereo inputs; each pair shares common-mode reference via AGND.
4, 28	Mute Control Inputs (MUTE_L, MUTE_R)	Digital logic inputs enabling simultaneous 100 dB attenuation on left/right outputs; active-high.
6, 7, 16, 17	Analog Audio Outputs (OUT_R, OUT_L, BOUT_R, BOUT_L)	Buffered line-level outputs (2 kΩ load capable); BOUT pins provide bass-boosted signals for external passive crossovers.
10, 11, 12, 19, 20, 21	External Tone Network Terminals (R1, R2, R3, C11–C17)	Connect to discrete RC components defining bass center frequency (~50–150 Hz) and treble center frequency (~5–10 kHz).
22, 23, 24, 25, 26, 27	Speaker Attenuator Outputs (LF, RF, LR, RR, BIN_L, BIN_R)	Four dedicated buffered outputs for front/rear left/right speakers; BIN pins carry bass-injected signals for subwoofer routing.
29 (not present), SCL/SDA (pins 26/27)	I²C Serial Interface (SCL, SDA)	Open-drain bidirectional bus lines requiring external 4.7 kΩ pull-ups to VS; support multi-drop configuration with fixed 0x44 address.

Key Features

Feature	Design Value
Loudness Compensation	Automatically applies frequency-dependent boost (peaking at ~100 Hz and ~5 kHz) scaled to volume setting, using external 100 nF capacitor for time constant tuning.
Input Gain Programmability	Selectable per-input gain (0/3.75/7.5/11.25 dB) enables optimal dynamic range matching between high-output CD players and low-output Bluetooth receivers.
Independent Speaker Fader	Four digitally controlled attenuators (LF/RF/LR/RR) allow real-time front-to-rear balance adjustment without analog trimming or relay switching.
Low-Noise Analog Path	2.5 µV input-referred noise (20–20 kHz) and 106 dB SNR ensure minimal degradation of source material in high-fidelity car audio head units.
Robust I²C Register Mapping	Subaddressed 8-bit command structure (e.g., 0x00 = volume, 0x06 = bass, 0x07 = treble) simplifies firmware integration and avoids register collision in multi-device buses.

Applications

Car Radio Head Unit

Aftermarket Stereo Receiver

Use Scenario: Integrated audio processor in OEM or aftermarket car radio controlling source mixing, loudness, and speaker distribution.

IC Role / Device Role / Timing Role: Central analog signal conditioner managing input selection, gain staging, tone shaping, and 4-channel fader logic via I²C from MCU.

Use Value: Eliminates need for discrete op-amp networks and mechanical potentiometers, reducing BOM count and improving long-term calibration stability.

Use Scenario: High-fidelity portable stereo system with Bluetooth, USB, and auxiliary inputs requiring consistent loudness across volume settings.

IC Role / Device Role / Timing Role: Digital-configurable analog front-end providing adaptive bass/treble and input gain optimization based on source type.

Use Value: Enables automatic loudness compensation that follows ISO 226 equal-loudness contours, preserving perceived clarity at low listening volumes.

Hi-Fi Docking Station

Multi-Zone Audio Controller

Use Scenario: Compact desktop docking station for smartphones/tablets delivering enhanced bass response and balanced stereo imaging.

IC Role / Device Role / Timing Role: Tone and volume processor interfacing directly with DAC output and driving line-level amplifiers with programmable bass injection.

Use Value: Provides ±14 dB bass/treble control with external RC tuning, allowing end-user customization of tonal balance without hardware changes.

Use Scenario: Multi-room audio system distributing stereo content to front, rear, and subwoofer zones with independent level control.

IC Role / Device Role / Timing Role: 4-channel speaker attenuator generating LF/RF/LR/RR outputs with synchronized mute and fader commands over shared I²C bus.

Use Value: Delivers precise inter-channel level matching (±0.5 dB tracking error) and 100 dB mute isolation-critical for zone-based volume synchronization.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7313	Successor IC with identical pinout, extended I²C address range (0x44/0x45), and improved THD (0.008%) but no loudness function.	Lacks integrated loudness compensation; requires external circuitry or MCU-based emulation for low-volume enhancement.	Choose for higher fidelity where loudness is handled in software or omitted entirely.
CS4272-CZZ	Audio codec with integrated ADC/DAC, 24-bit resolution, and DSP-based tone control-but no analog input multiplexer or speaker-level fader outputs.	Requires external analog front-end for legacy line inputs; lacks dedicated speaker attenuator buffers and bass-injection outputs.	Choose when digital audio path (I²S/PCM) dominates and analog signal conditioning is secondary.

Compared with TDA7303, TDA7313 offers tighter distortion performance and dual-I²C addressing but removes loudness; CS4272-CZZ provides superior resolution and digital flexibility but shifts signal conditioning burden to external components and firmware.

Availability

TDA7303 is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket stereo receivers, and portable Hi-Fi docking stations requiring stable component supply and long-lifecycle support.

Supply support for TDA7303 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 consumer ICs with strong analog and power portfolio depth.

The TDA7303 belongs to ST's automotive-grade audio processor family, engineered specifically for cost-sensitive, high-SNR car radio and portable audio applications demanding analog precision and digital configurability.

FAQ

What is the maximum input signal level the TDA7303 can handle without clipping?

The TDA7303 supports up to 2 Vrms input signal handling (V_CL) at 1 kHz with ≤0.3% distortion. Clipping occurs at 2.5 Vrms under typical conditions (VS = 9 V, RL = 2 kΩ). Input gain settings (0–11.25 dB) must be selected to prevent overload when interfacing with high-output sources such as CD players or DACs.

How is loudness compensation implemented and configured?

Loudness compensation is analog and voltage-controlled, activated by setting the LOUD bit in the audio switch register. Its frequency response and intensity depend on an external 100 nF capacitor (C_CLOUD) connected to pin 12. The boost profile scales automatically with volume attenuation, peaking at ~100 Hz and ~5 kHz per ISO 226 curves.

Can the TDA7303 drive headphones directly?

No-the TDA7303 outputs are line-level (2 kΩ load capable, 2.5 Vrms max) and lack headphone driver capability (no 32 Ω or 16 Ω output stage). It must interface with external headphone amplifiers or power stages. Its BIN(L)/BIN(R) outputs provide bass-enhanced signals intended for subwoofer amplifiers, not direct transducer drive.

What I²C address does the TDA7303 use and how is it set?

The TDA7303 uses a fixed 7-bit I²C address of 0x44 (1000100b), with the R/W bit making the full byte 0x88 for write operations. No hardware address pins exist-addressing is hardwired. The device acknowledges only this address and ignores all others, ensuring reliable communication in multi-peripheral I²C systems.

TDA7303 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Last Time Buy

Function:: Audio Tone Processor

Applications:: Audio

Number of Channels:: 2

Interface:: I2C

Voltage - Supply:: 6V ~ 10V

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

Specifications:: 1.25dB

Mounting Type:: Surface Mount

Grade:: Automotive

TDA7303 FAQ

1.How can I place an order for TDA7303 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7303 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 TDA7303 reliable?

The price and inventory of TDA7303 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7303 is usually 5 days.

3.What payment methods are accepted for TDA7303?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7303 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7303?

TDA7303 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7303 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 TDA7303?

For technical support, including TDA7303 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7303 requirements.

6.How does Aetrix verify that TDA7303 is sourced from the original manufacturer or authorized distributors?

All TDA7303 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 TDA7303 meets industry standards.

7.What is the process for return or replacement of TDA7303?

All TDA7303 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7303, 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 TDA7303 part is unused and in its original packaging.

Return procedure for TDA7303:

1.Submit a request within 90 days.

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

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