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STMicroelectronics TDA7402
- Part No.:
- TDA7402
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 44-LQFP Exposed Pad
- Datasheet:
-
TDA7402.pdf
- Description:
- IC AUDIO SIGNAL PROCESSOR 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,666
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Product details
Overview
TDA7402 from STMicroelectronics is a car radio signal processor integrating stereo audio processing, RDS-capable stereo decoding, AM/FM noise blanking, and programmable multipath detection in a single LQFP44 package. It supports 3 stereo + 3 mono inputs, provides four independent speaker outputs plus stereo subwoofer output, implements soft-step volume control, dynamic compression for CD sources, and voice-band filtering - all controlled via I²C bus for automotive head unit designs.
For engineers reviewing the TDA7402 datasheet, TDA7402 pinout, TDA7402 application, or TDA7402 equivalent, this device serves as a complete low-frequency signal processor for modern car radios - requiring attention to its dual-domain architecture (audioprocessor + decoder/noiseblanker), I²C register mapping, differential input routing, and RDS mute timing constraints.
Technical Context
The TDA7402 combines two functionally distinct subsystems on one die: a fully programmable audioprocessor with bass/treble/loudness/voice-band filters, soft mute, and mixing logic; and a dedicated stereo decoder-noiseblanker block featuring RDS mute, programmable multipath detection, quality detector output, and AM/FM noise suppression with multiple trigger controls.
Its I²C interface enables full configuration of filter center frequencies (e.g., bass at 80 Hz, treble at 17.5 kHz), attenuation ranges (±14 dB), quality factors (Q = 1), soft-step timing (16–128 ms), and noiseblanker thresholds - all without external passive components, making it suitable for production car audio systems where calibration stability and BOM reduction are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5 V ±5% - powers both audioprocessor and decoder blocks; requires stable low-noise rail for analog performance |
| Audio Inputs | 3 stereo (FD1, FD2, SE1) + 3 mono (MD1, MD2, AM) - supports multi-source car radio with differential and single-ended options |
| Bass Control | Center frequency 80 Hz, ±14 dB gain, Q = 1 - fixed-frequency shelving EQ optimized for cabin acoustic response |
| Treble Control | Center frequency 17.5 kHz, ±14 dB gain - high-frequency boost/cut targeting tweeter compensation |
| Soft Step Volume | Adjustable step time: 16–128 ms - eliminates zipper noise during volume changes in automotive environments |
| I²C Interface | Standard-mode (100 kHz), 7-bit address - enables host MCU to configure all audio and decoder parameters dynamically |
| Noise Blanker Triggers | FM peak detector, AM mode, multipath level, stereo blend voltage - adaptive blanking reduces impulse noise without muting valid audio |
Pinout & Package
LQFP44 (10 × 10 × 1.4 mm), thermally enhanced with exposed pad; RoHS-compliant, obsolete but supported for legacy automotive repair and replacement programs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FD1L+/SE3L | Differential left channel input 1 / stereo input 3 left | Primary high-SNR stereo source path; accepts balanced or single-ended signals |
| AM | AM demodulator input | Direct connection to AM IF stage output; feeds stereo decoder's AM noiseblanker path |
| MPX | FM MPX composite input | Carries pilot tone + L−R + RDS data; routed to stereo decoder and RDS mute logic |
| QUAL | Multipath quality detector output | Analog voltage proportional to multipath severity; used for display or automatic source switching |
| SDA / SCL | I²C bidirectional data / clock | Host-controlled configuration interface; supports register read/write for all audio and decoder functions |
| ACOUTL / ACOUTR | Left/right main speaker outputs | Capable of driving 4 Ω loads directly; include internal attenuators and mixing capability |
| SWINL / SWINR | Stereo subwoofer input | Post-filtered low-frequency path; configurable LPF cutoff (80/120/160 Hz) and HPF (90/135/180 Hz) |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic compression for CD | Anti-clipping compander with programmable characteristic - preserves transient integrity while preventing amplifier saturation |
| Voice-band filter | Configurable HPF (300–750 Hz) + LPF (3–6 kHz) - isolates speech band for hands-free telephony or voice guidance |
| RDS mute | Automatic audio muting during RDS data reception - prevents interference from data bursts on FM carrier |
| Pause detector | Identifies silent intervals ≥100 ms in audio stream - triggers MUX-output switching or display timeout in head units |
| No external adjustments | All filter coefficients, mute timing, and noiseblanker thresholds set digitally - eliminates trimmer potentiometers and calibration labor |
Applications
| Car Radio Head Unit | Aftermarket Stereo Receiver |
|---|---|
Use Scenario: Integrated audio processor in OEM or Tier-1 head unit supporting AM/FM, CD, and auxiliary inputs. IC Role / Device Role / Timing Role: Central low-frequency signal conditioner - performs input selection, loudness compensation, bass/treble shaping, and RDS-aware muting. Use Value: Eliminates need for discrete op-amps, filters, and mute logic; reduces PCB area by >30% versus discrete solution. |
Use Scenario: Feature-rich aftermarket receiver with multi-zone output, subwoofer management, and voice-band filtering. IC Role / Device Role / Timing Role: Audio domain controller - handles soft-step volume, independent speaker attenuation, and stereo subwoofer crossover synthesis. Use Value: Enables simultaneous 4-speaker + subwoofer drive with per-channel digital level control and no external passive tuning. |
| Automotive Infotainment Gateway | Telematics Voice Interface |
Use Scenario: Signal preprocessing stage in connected infotainment system with Bluetooth audio and navigation prompts. IC Role / Device Role / Timing Role: Input mixer and format adapter - blends analog radio, digital BT, and navigation audio with synchronized mute timing. Use Value: Provides seamless source transitions using pause detection and soft mute, avoiding audible clicks during context switches. |
Use Scenario: In-cabin voice assistant front-end with noise-suppressed microphone path and speech band isolation. IC Role / Device Role / Timing Role: Voice-band conditioning block - applies HPF/LPF to narrowband speech and suppresses engine/road noise via noiseblanker. Use Value: Delivers clean 300–3000 Hz voice signal to ASR engine, improving wake-word accuracy in noisy driving conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar car radio signal processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7403 | Successor IC with identical pinout, extended I²C register set, improved SNR (95 dB vs. 92 dB), and added digital audio interface support | Supports TDM/I²S input alongside analog; required for new designs needing digital source integration | Select when upgrading legacy TDA7402 designs or adding Bluetooth/Aux digital inputs |
| STA559BW | Digital audio processor with integrated Class-D amplifier; lacks analog stereo decoder and noiseblanker blocks | Targeted at amplified speaker modules - not suitable as direct replacement for radio signal chain processing | Consider only for compact amplified subwoofer modules where decoding is handled upstream |
Compared with TDA7402, TDA7403 offers backward-compatible upgrade path with enhanced audio fidelity and digital interface readiness, while STA559BW serves a fundamentally different system role - combining processing and power amplification rather than pure signal conditioning for tuner-based architectures.
Availability
TDA7402 is available at Aetrix Electronics and suitable for automotive head unit manufacturing, infotainment gateway development, and telematics voice interface design requiring stable component supply and long-term lifecycle support.
Supply support for TDA7402 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 strong analog/mixed-signal heritage.
The TDA7402 belongs to ST's automotive audio processor family, designed specifically to consolidate radio signal chain functions - from IF interface through audio enhancement to speaker drive - into a single programmable device for cost-sensitive, high-reliability car radio platforms.
FAQ
Is the TDA7402 still in production?
No - STMicroelectronics declared TDA7402 obsolete in 2012. However, Aetrix Electronics maintains verified legacy stock with full traceability and supports engineering reuse in maintenance, repair, and legacy program continuity scenarios under controlled supply terms.
Does the TDA7402 support RDS data decoding?
No - the TDA7402 supports RDS mute (automatically silences audio during RDS data bursts) but does not decode or output RDS data. An external RDS decoder IC (e.g., TDA7330) is required for full RDS text/data functionality.
What is the maximum load impedance the speaker outputs can drive?
The ACOUTL/ACOUTR and subwoofer outputs are specified for 4 Ω minimum load. Driving 2 Ω loads is not recommended due to thermal limitations and potential distortion increase beyond datasheet limits at full output swing.
Can the noise blanker be disabled for AM-only operation?
Yes - the noise blanker is fully programmable via I²C registers; AM-specific blanking can be disabled independently of FM blanking, and trigger sensitivity thresholds can be set to zero to effectively bypass the function while retaining decoder operation.
TDA7402 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 44-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Audio Signal Processor
- Applications:
- Audio
- Number of Channels:
- 4
- Interface:
- I2C
- Voltage - Supply:
- 7.5V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7402 FAQ
1.How can I place an order for TDA7402 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7402 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 TDA7402 reliable?
The price and inventory of TDA7402 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7402 is usually 5 days.
3.What payment methods are accepted for TDA7402?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7402 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7402?
TDA7402 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7402 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 TDA7402?
For technical support, including TDA7402 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7402 requirements.
6.How does Aetrix verify that TDA7402 is sourced from the original manufacturer or authorized distributors?
All TDA7402 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 TDA7402 meets industry standards.
7.What is the process for return or replacement of TDA7402?
All TDA7402 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7402, 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 TDA7402 part is unused and in its original packaging.
Return procedure for TDA7402:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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