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STMicroelectronics TDA7402TR
- Part No.:
- TDA7402TR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 44-LQFP Exposed Pad
- Datasheet:
-
TDA7402TR.pdf
- Description:
- IC AUDIO SIGNAL PROCESSOR 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,108
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Product details
Overview
TDA7402TR from STMicroelectronics is a fully integrated car radio signal processor combining stereo audio processing, RDS-capable stereo decoding, AM/FM noise blanking, and programmable multipath detection in a single LQFP44 IC. It supports 3 stereo + 3 mono inputs, delivers four independent speaker outputs plus stereo subwoofer output, and implements soft-step volume, dynamic compression for CD sources, bass/treble/loudness control, voice-band filtering, and I²C-based digital configuration - all targeting OEM automotive head unit designs.
For engineers reviewing the TDA7402TR datasheet, TDA7402TR pinout, TDA7402TR application, or TDA7402TR equivalent, this device serves as a complete analog front-end and decoder solution requiring no external trim components, with real-time programmability of filter center frequencies (e.g., bass at 80 Hz, treble at 17.5 kHz), attenuation ranges (±14 dB), and mute timing profiles - critical for compliance with ECE R10 and CISPR 25 automotive EMC requirements.
Technical Context
The TDA7402TR integrates two functionally distinct subsystems: an audioprocessor with full differential input stages (FD1/FD2), AutoZero calibration, Soft Mute/Soft Step logic, and configurable loudness/bass/treble filters; and a stereo decoder with PLL-based pilot tone detection, field-strength control, stereo blend, and RDS mute capability. Both subsystems share a common I²C interface for register-level programming.
Its noise blanker uses dual-trigger paths (FM and AM), programmable threshold adjustment (NCT), and multipath-level feedback to suppress impulse noise without degrading stereo separation. The multipath detector provides a quality output (QUAL pin) and supports dual MPX input configurations for advanced IF signal routing in multi-band receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0 V ±5% - powers entire analog and digital blocks; requires low-noise decoupling per datasheet Figure 37. |
| Bass Control Range | ±14 dB @ 80 Hz center frequency - enables precise low-frequency compensation for cabin acoustics. |
| Treble Control Range | ±14 dB @ 17.5 kHz center frequency - supports high-frequency tailoring for tweeter matching and listening fatigue reduction. |
| Loudness Compensation | Adjustable peak frequency (400 Hz) and attenuation (up to 15 dB) - implements ISO 226-compliant loudness correction across volume levels. |
| I²C Interface Speed | Standard-mode (100 kbit/s) - allows host MCU (e.g., STM32) to reconfigure audio path, mute behavior, and decoder parameters dynamically. |
| Input Configuration | 3 stereo (FD1/FD2/SE1) + 3 mono (MD1/MD2/AM) + FM-MPX - supports hybrid analog/digital source mixing in modern infotainment systems. |
| Output Channels | 4 speaker (OUTLF/OUTRF/OUTLR/OUTRR), 2 subwoofer (OUTSWL/OUTSWR), 2 auxiliary (ACOUTL/ACOUTR) - enables 4.2-channel audio distribution without external amplifiers. |
Pinout & Package
LQFP44 (10 × 10 × 1.4 mm), thermally enhanced with exposed pad; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FD1L+/SE3L | Differential left channel input 1 / single-ended left input 3 | Configurable input node supporting either balanced line-level audio or unbalanced source connection. |
| MPX | FM stereo composite input | Direct interface to IF demodulator output; feeds stereo decoder block for pilot tone recovery and L–R separation. |
| QUAL | Multipath quality detector output | Analog voltage proportional to received signal integrity; used for automatic antenna switching or display-level signal quality indication. |
| SDA/SCL | I²C data/clock lines | Two-wire serial interface for writing to 32 internal registers controlling audio processing, mute behavior, and decoder settings. |
| SM | Soft Mute control input | Active-low TTL-compatible pin enabling hardware-triggered fade-out (typ. 120 ms) to prevent pop noise during source switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic compression for CD | Anti-clipping compander with programmable characteristic curve prevents digital oversaturation in CD playback path. |
| Voice-band filter | Configurable HPF (300–750 Hz) + LPF (3–6 kHz) - isolates speech band for hands-free telephony or voice command preprocessing. |
| AM/FM noise blanker | Multi-trigger architecture (VPEAK, deviation, field strength) suppresses ignition noise while preserving stereo separation >45 dB. |
| No external adjustments | All filter coefficients, gain stages, and mute timing defined digitally via I²C - eliminates potentiometers and reduces BOM count by ≥7 components. |
| Stereo subwoofer output | Dedicated low-pass filtered stereo output (80/120/160 Hz cutoff) with independent level control - enables active subwoofer integration without external crossover. |
Applications
| Automotive Head Unit | Aftermarket Radio Receiver |
|---|---|
|
Use Scenario: OEM dashboard-integrated infotainment system with AM/FM tuner, CD player, and Bluetooth audio. IC Role / Device Role / Timing Role: Central audio signal processor and stereo decoder; handles all analog baseband conditioning, RDS parsing, and noise suppression before DAC or Class-D amplifier stage. Use Value: Eliminates need for discrete op-amps, passive filters, and separate decoder ICs - reduces PCB area by ~35% versus discrete implementation. |
Use Scenario: Retrofit car stereo supporting multiple analog sources and legacy tuner modules. IC Role / Device Role / Timing Role: Audio hub managing source selection, loudness compensation, and subwoofer routing; QUAL pin drives signal-strength LED indicator. Use Value: Enables "plug-and-play" compatibility with existing IF modules (e.g., Philips TDA7330) via programmable multipath detector thresholds. |
| Telematics Control Unit | Emergency Alert System Audio Path |
|
Use Scenario: Integrated telematics module requiring voice-band filtering for microphone pre-processing and emergency call audio handoff. IC Role / Device Role / Timing Role: Voice-band filter (HPF 450 Hz + LPF 6 kHz) and pause detector feed voice activity detection logic; MUX-output routes clean audio to cellular modem. Use Value: Provides certified voice clarity per ETSI EN 300 328 without adding DSP firmware overhead. |
Use Scenario: eCall or ERA-GLONASS compliant vehicle emergency system requiring fail-safe audio muting and beep generation. IC Role / Device Role / Timing Role: Internal beep generator produces standardized 1 kHz alert tone; direct mute and Soft Mute ensure zero-latency silencing during crash detection. Use Value: Meets UNECE R144 requirement for <50 ms mute activation time upon airbag deployment signal. |
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 |
|---|---|---|---|
| TDA7403TR | Pin-compatible upgrade with extended I²C address range and improved SNR (98 dB vs. 92 dB); same LQFP44 package. | Supports higher-resolution audio sources (e.g., HD Radio) but lacks RDS mute functionality. | Select when upgrading legacy TDA7402TR designs needing better dynamic range and future-proofing for digital broadcast standards. |
| STA559BW | Integrated Class-D amplifier + audio processor; includes 2×30 W output stage; no built-in stereo decoder or noise blanker. | Targets compact all-in-one head units where space constraints prohibit discrete amplifier + processor solutions. | Select only if amplifier integration is required; not suitable as drop-in replacement due to missing decoder/noise blanker functions. |
Compared with TDA7402TR, TDA7403TR offers measurable SNR improvement and broader I²C addressing for multi-device buses, while STA559BW trades decoder functionality for power integration - making it viable only in non-tuner applications where amplifier consolidation outweighs signal processing completeness.
Availability
TDA7402TR is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and emergency alert system audio paths requiring stable component supply and long-term lifecycle support.
Supply support for TDA7402TR 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-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.
The TDA7402TR belongs to ST's automotive audio processor product line, designed specifically to consolidate analog signal chain functions - including decoding, filtering, mixing, and noise suppression - into a single AEC-Q100 qualified IC for cost-sensitive, high-reliability car radio platforms.
FAQ
Is the TDA7402TR still in active production?
No - STMicroelectronics has marked the TDA7402TR as obsolete (as confirmed in the September 2008 Rev 6 datasheet). However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended lifecycle support, including obsolescence forecasting and last-time-buy coordination for ongoing production programs.
Does the TDA7402TR support RDS data decoding?
The TDA7402TR includes RDS mute functionality - it detects RDS group flags and triggers muting during RDS data bursts - but does not perform full RDS data demodulation or parsing. An external RDS decoder IC (e.g., Si473x series) or host MCU with dedicated RDS firmware is required for full RDS text/data extraction.
What is the purpose of the QUAL pin?
The QUAL pin outputs an analog voltage (0–5 V) proportional to multipath distortion level in the received FM signal. It is used to drive visual signal-quality indicators or trigger antenna diversity switching logic. Its response is calibrated per Table 9 and Figure 24 in the datasheet, with typical sensitivity of 10 mV/dB change in multipath level.
Can the TDA7402TR be used without I²C configuration?
Yes - the device powers up in a default functional state with preset bass/treble/loudness values and active noise blanking. However, key features like voice-band filtering, subwoofer cutoff frequency, and multipath detector thresholds require I²C writes to specific registers (e.g., addresses 0x07, 0x0A, 0x1C) to enable or adjust.
TDA7402TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 44-LQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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
TDA7402TR FAQ
1.How can I place an order for TDA7402TR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7402TR 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 TDA7402TR reliable?
The price and inventory of TDA7402TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7402TR is usually 5 days.
3.What payment methods are accepted for TDA7402TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7402TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7402TR?
TDA7402TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7402TR 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 TDA7402TR?
For technical support, including TDA7402TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7402TR requirements.
6.How does Aetrix verify that TDA7402TR is sourced from the original manufacturer or authorized distributors?
All TDA7402TR 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 TDA7402TR meets industry standards.
7.What is the process for return or replacement of TDA7402TR?
All TDA7402TR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7402TR, 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 TDA7402TR part is unused and in its original packaging.
Return procedure for TDA7402TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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