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STMicroelectronics TDA7303TR
- Part No.:
- TDA7303TR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TDA7303TR.pdf
- Description:
- IC AUDIO TONE PROCESSOR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,381
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Product details
Overview
TDA7303TR 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. Used in car radio head units for dynamic loudness adaptation at low listening levels.
For engineers reviewing the TDA7303TR datasheet, TDA7303TR pinout, TDA7303TR application, or TDA7303TR equivalent, key selection criteria include its SO-28 package compatibility, bipolar/CMOS low-distortion architecture (0.01% THD), 106 dB signal-to-noise ratio, 100 dB mute attenuation, and programmable I²C address (0x44) for multi-device bus integration.
Technical Context
The TDA7303TR integrates analog signal conditioning (resistor-switch networks + op-amps) with digital I²C control logic to implement real-time stereo audio processing without external DSP. Its input multiplexer selects among three stereo sources while applying gain scaling before routing to shared tone/volume/fader blocks.
All audio path functions-including bass (±14 dB, 2 dB steps), treble (±14 dB, 2 dB steps), speaker attenuators (−38.75 to 0 dB, 1.25 dB steps), and loudness curve (voltage-dependent, capacitor-tuned)-are configured via 8-bit register writes. The device operates from 6–10 V supply and draws 8–11 mA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 6–10 V - Supports automotive battery range (cold crank to load dump) without external regulators. |
| Volume Control Range | −78.75 to 0 dB in 1.25 dB steps - Enables precise acoustic calibration across 63 discrete attenuation levels. |
| Bass/Treble Range | ±14 dB in 2 dB steps - Provides sufficient tonal shaping for cabin acoustics compensation in vehicles. |
| Speaker Attenuation | −38.75 to 0 dB per channel (LF/RF/LR/RR) - Implements full front-rear and left-right fader/balance functionality. |
| THD+N | 0.01% @ 1 kHz, 1 Vrms - Ensures high-fidelity output with minimal harmonic corruption in midband. |
| Signal-to-Noise Ratio | 106 dB - Achieves studio-grade dynamic range suitable for premium car audio amplification stages. |
| Mute Attenuation | 100 dB - Guarantees complete audio silencing during system transitions or fault conditions. |
| I²C Clock Speed | Up to 400 kbit/s - Compatible with standard Fast-mode I²C microcontrollers without timing margin concerns. |
Pinout & Package
Package: SO-28 (Small Outline, 28-pin, 300 mil width), ECOPACK® compliant, surface-mount. Pin pitch: 1.27 mm, body dimensions: 17.9 × 10.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 13–15 | Stereo Input Channels | Pins 1–3: L1/R1, L2/R2, L3/R3 - Three independent stereo inputs with internal 2.2 µF AC coupling and selectable gain. |
| 4, 28 | I²C Interface | Pin 4 = SDA (bidirectional data), Pin 28 = SCL (clock) - Require external pull-up resistors to VS for bus operation. |
| 6, 7, 16–18, 20–24 | Audio Outputs | Pins 6/7 = OUT(R)/OUT(L); 16–18 = BOUT(L)/BIN(L)/LOUD(L); 20–24 = BOUT(R)/BIN(R)/LOUD(R)/SPKR ATT outputs - Drive external power amp inputs or passive networks. |
| 8, 9, 10, 11 | Gain/Bass/Treble Tuning | Pins 8 (CREF), 9–11 (R1–R3) - Set loudness corner frequency and bass/treble Q/resonance via external RC components. |
| 12, 19, 25–27 | Control & Reference | Pin 12 = LOUD(L), Pin 19 = BASS, Pin 25 = VOL+LOUD, Pin 26–27 = SPKR ATT control - Analog control nodes for optional manual override or feedback. |
| 5, 22 | Ground | Pin 5 = AGND (analog ground), Pin 22 = DIGGND (digital ground) - Must be separated and joined at single point to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| 3-Input Stereo Multiplexer | Selects among L1/R1, L2/R2, L3/R3 with per-input gain adjustment (0–11.25 dB), enabling flexible source switching in multi-media head units. |
| Loudness Compensation | Programmable loudness curve (via CLOUD capacitor) that boosts bass/treble at low volume settings to match human ear sensitivity (Fletcher-Munson effect). |
| Independent Speaker Attenuation | Four dedicated channels (LF/RF/LR/RR) with 1.25 dB resolution and mute capability - eliminates need for external relay or analog switch networks. |
| Bipolar/CMOS Process | Combines low-noise analog front-end (2.5 µV input noise) with robust digital control - achieves <0.01% THD and 106 dB SNR simultaneously. |
| I²C Address Flexibility | Fixed 7-bit address 0x44 (1000100b), allowing daisy-chaining with other ST audio processors on same bus without address conflict. |
Applications
| Automotive Infotainment Head Unit | Aftermarket Car Stereo Receiver |
|---|---|
|
Use Scenario: Central audio processor in OEM or Tier-1 head unit managing AM/FM, Bluetooth, USB, and AUX inputs. IC Role / Device Role / Timing Role: Volume/tone/fader controller interfacing between DSP or microcontroller and analog power amplifier stage. Use Value: Reduces BOM count by integrating 3-input mux, 4-channel fader, loudness, and tone controls into single SO-28 IC - simplifies PCB layout and calibration. |
Use Scenario: Core audio conditioning IC in plug-and-play aftermarket stereo supporting multiple input sources and speaker configurations. IC Role / Device Role / Timing Role: Analog signal router and equalizer with I²C-configurable gain and attenuation - enables user-adjustable fader/balance via front-panel encoder. Use Value: Delivers 100 dB mute isolation and ±14 dB tone control to meet THX Mobile certification requirements for spectral accuracy and dynamic range. |
| Portable High-Fidelity Audio Dock | Marine Audio System Processor |
|
Use Scenario: Audio hub in premium Bluetooth dock for smartphones/tablets, handling line-in, optical, and wireless inputs. IC Role / Device Role / Timing Role: Input selector and loudness-compensated volume controller feeding Class D amplifier - maintains perceived loudness across playback volumes. Use Value: 1.25 dB volume steps and 106 dB SNR preserve detail in quiet passages; SO-28 package supports compact dual-layer PCB design. |
Use Scenario: Signal conditioner in marine-rated audio system exposed to salt, humidity, and wide temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust analog audio processor with 6–10 V operation and thermal resistance ≤85 °C/W - sustains performance under engine-bay proximity. Use Value: 100 nF external CLOUD capacitor enables customizable loudness curve for open-deck acoustic environments where bass roll-off is pronounced. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7313TR | Successor IC with identical SO-28 footprint but adds 5-band EQ, soft mute, and enhanced I²C error handling; higher supply current (13 mA). | Requires firmware update for new register map; supports advanced tuning in premium OEM systems where 3-band tone is insufficient. | Choose when future-proofing for multi-band EQ or needing improved bus robustness in noisy vehicle EMI environments. |
| CS4272-CQZ | 24-bit stereo DAC + analog mixer (not pure analog processor); requires external clock and digital audio interface (I²S); no built-in loudness function. | Used in digital-first architectures where audio is processed digitally prior to conversion - lacks analog input mux and gain control. | Choose only if system already employs digital audio transport and external DAC is acceptable; not a drop-in replacement. |
Compared with TDA7303TR, TDA7313TR offers expanded feature set at minor cost and power penalty, while CS4272-CQZ shifts architecture to digital domain - making TDA7303TR optimal for cost-sensitive analog-centric designs requiring loudness and fader in one chip.
Availability
TDA7303TR is available at Aetrix Electronics and suitable for automotive infotainment, aftermarket stereo receivers, and marine audio systems requiring stable component supply and long-lifecycle support.
Supply support for TDA7303TR 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 analog, power, and automotive ICs with strong IP in audio signal processing and automotive-grade reliability.
The TDA7303TR belongs to ST's automotive audio processor product line, engineered specifically for cost-effective, high-SNR analog signal conditioning in resource-constrained head units and portable audio systems.
FAQ
What is the maximum input signal level the TDA7303TR can handle without clipping?
The TDA7303TR supports up to 2 VRMS input signal level (VCL) at 1 kHz with 0.3% distortion, verified under typical conditions (VS = 9 V, RL = 10 kΩ). Input resistance is 50 kΩ per channel, and internal clipping protection activates above this threshold to prevent output saturation.
Does the TDA7303TR require external passive components for basic operation?
Yes - essential external components include: four 2.2 µF AC-coupling capacitors on input pins (1–3, 13–15), 100 nF CLOUD capacitor on pin 12 for loudness, and pull-up resistors (typically 4.7 kΩ) on SDA (pin 4) and SCL (pin 28). Bass/treble center frequency tuning also requires external R/C networks on pins 8–11.
Can the TDA7303TR operate from a 5 V supply?
No - the absolute minimum supply voltage is 6 V, and recommended operating range is 6–10 V per datasheet Table 3. Operation below 6 V risks undefined behavior in analog biasing and I²C interface logic; it is not rated for 5 V systems and lacks 5 V tolerant I/O.
How is loudness compensation implemented and can it be disabled?
Loudness is implemented via an external 100 nF capacitor on pin 12 (CLOUD) and internal voltage-dependent gain boost circuitry that increases bass/treble at low volume settings. It is enabled/disabled by writing bit 7 of the audio switch register (0 = ON, 1 = OFF), allowing full software control without hardware modification.
TDA7303TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TDA7303TR FAQ
1.How can I place an order for TDA7303TR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7303TR 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 TDA7303TR reliable?
The price and inventory of TDA7303TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7303TR is usually 5 days.
3.What payment methods are accepted for TDA7303TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7303TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7303TR?
TDA7303TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7303TR 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 TDA7303TR?
For technical support, including TDA7303TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7303TR requirements.
6.How does Aetrix verify that TDA7303TR is sourced from the original manufacturer or authorized distributors?
All TDA7303TR 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 TDA7303TR meets industry standards.
7.What is the process for return or replacement of TDA7303TR?
All TDA7303TR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7303TR, 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 TDA7303TR part is unused and in its original packaging.
Return procedure for TDA7303TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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