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STMicroelectronics TDA7461ND
- Part No.:
- TDA7461ND
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TDA7461ND.pdf
- Description:
- IC AUDIO SIGNAL PROCESSOR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,619
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Product details
Overview
TDA7461ND from STMicroelectronics is a fully integrated car radio signal processor IC combining audio processing, stereo decoding, noise blanking, and multipath detection in a single SO-28 package. It features programmable bass/treble (±14 dB, 2nd-order), 79 dB volume range, soft-mute with four time constants, and I²C-controlled configuration - enabling complete front-end signal conditioning for analog FM/AM/CD/cassette radio systems without external passive components.
For engineers reviewing the TDA7461ND datasheet, TDA7461ND pinout, TDA7461ND application, or TDA7461ND equivalent, this device serves as a legacy but production-supported solution for cost-sensitive automotive infotainment head units requiring high-channel-count analog audio routing, stereo blend control, pilot tone detection, and real-time interference suppression in noisy RF environments.
Technical Context
The TDA7461ND implements a switched-capacitor architecture with BiCMOS process technology, eliminating need for external capacitors or trims while delivering low distortion (<0.01% THD+N) and low output noise (9–15 µV RMS). Its stereo decoder includes PLL-based pilot tone recovery, de-emphasis, field-strength control, and stereo blend adjustment - all digitally configurable via I²C.
The audio processor integrates a 10-input programmable multiplexer (CD, cassette, AM, phone, MPX), loudness compensation (400 Hz center, ±15 dB), second-order bass (80 Hz) and treble (17.5 kHz) filters, and four independent speaker attenuators (50 dB range, 1 dB steps) - supporting full left/right/front/rear channel management in multi-speaker car audio systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7.5–10 V - supports direct connection to automotive battery rail with built-in ripple rejection (45 dB @ 1 kHz). |
| Supply Current | 25–35 mA @ 9 V - enables low-power operation in always-on radio modules without thermal derating. |
| THD+N | <0.01% - ensures high-fidelity audio reproduction across full 20 Hz–20 kHz bandwidth with flat filter response. |
| Output Noise | 9–15 µV RMS (20 Hz–20 kHz) - eliminates audible hiss in pre-amplifier stage before external power amplifiers. |
| Volume Control Range | −79 dB to +20 dB in 1 dB steps - provides precise gain staging for mixed-source inputs (FM, CD, cassette) with soft-step transition. |
| Stereo Separation | 80–100 dB - maintains channel integrity during stereo blend and multipath correction operations. |
| Multipath Detection | Dedicated MPIN/MPOUT pins with internal detector - enables real-time FM signal quality monitoring and automatic station retuning logic. |
Pinout & Package
Package: SO-28 (Small Outline, 300 mil width), RoHS-compliant, ECOPACK® option available. Pin pitch: 1.27 mm. Thermal resistance: 85 °C/W (junction-to-pins).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ACINL | Left speaker-stage analog input | Differential-capable input for CD/cassette left channel; 100 kΩ input impedance minimizes source loading. |
| 11 MPX | FM multiplex input | Accepts 19 kHz pilot + 38 kHz DSB-SC stereo composite signal for internal demodulation and decoding. |
| 14 MPOUT | Multipath detector output | Open-drain digital flag indicating multipath interference severity - used for microcontroller-triggered station search. |
| 18 SCL / 19 SDA | I²C bus interface | Bi-directional serial control lines supporting standard-mode (100 kHz) and fast-mode (400 kHz) configuration of all audio/decoder parameters. |
| 25 OUTLF / 22 OUTRR | Front/rear speaker outputs | Four dedicated buffered outputs (LF, RF, LR, RR) drive external Class AB/D amplifiers directly; DC-coupled, ±2.6 VRMS clipping level. |
| 26 CREF | Reference capacitor connection | Connects external 100 nF capacitor to stabilize internal switched-capacitor clock and filter tuning accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| No external passive components required | Switched-capacitor architecture eliminates need for external resistors/capacitors - reduces BOM count and PCB area by >30% vs discrete solutions. |
| Fully programmable stereo decoder | I²C-configurable pilot tone detection, de-emphasis time constant (50/75 µs), high-cut slope, and stereo blend ratio - enables regional broadcast standard compliance. |
| Noise blanker with adaptive threshold | Auto-adjusting trigger threshold based on peak envelope (VPEAK) and FM deviation - suppresses ignition noise bursts without affecting audio fidelity. |
| Soft mute with four time constants | Selectable mute delay (0.48 ms to 600 ms) and attenuation depth (60–100 dB) - prevents click/pop during station switching or mute activation. |
| Independent 4-channel speaker control | 1 dB resolution attenuation per channel (LF/RF/LR/RR) up to 50 dB - enables precise cabin acoustic tuning without external DACs or op-amps. |
Applications
| OEM Automotive Radio Head Units | Aftermarket Car Stereo Receivers |
|---|---|
Use Scenario: Integrated analog front-end for mid-tier vehicle infotainment systems supporting FM/AM, CD, and cassette playback. IC Role / Device Role / Timing Role: Central signal processor handling all baseband audio routing, stereo decoding, noise suppression, and speaker-level pre-conditioning before power amplification. Use Value: Reduces system component count by consolidating audio processor, stereo decoder, and multipath detector into one IC - lowering total cost and improving reliability in vibration-prone environments. |
Use Scenario: Feature-rich aftermarket receiver with multi-source support, loudness compensation, and customizable EQ for diverse speaker configurations. IC Role / Device Role / Timing Role: Programmable audio hub managing input selection, volume/bass/treble scaling, soft-mute sequencing, and rear-channel blending via I²C host MCU. Use Value: Enables rapid firmware-based feature differentiation (e.g., bass boost profiles, noise blanker sensitivity) without hardware changes - accelerating product variants. |
| FM Radio Modules for Telematics | Legacy Broadcast Audio Processors |
Use Scenario: Compact FM tuner module embedded in telematics control units requiring robust reception under multipath conditions (urban canyons, tunnels). IC Role / Device Role / Timing Role: Real-time multipath detector feeding status to host MCU for adaptive antenna switching or frequency re-scan decisions. Use Value: Provides deterministic multipath flag (MPOUT) with sub-millisecond latency - enabling faster station lock recovery than software-based DSP approaches. |
Use Scenario: Drop-in replacement for aging radio processors in service parts inventory or repair depots maintaining legacy vehicle platforms. IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade path for TDA7313/TDA7318-based designs needing enhanced noise immunity and stereo decoding fidelity. Use Value: Maintains identical SO-28 footprint and I²C register map - allowing minimal PCB rework and firmware reuse across multiple vehicle generations. |
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 |
|---|---|---|---|
| TDA7318 | Fixed-function audio processor only; no stereo decoder, multipath detector, or noise blanker - requires external decoder IC. | Limited to mono/stereo preamp tasks; cannot replace full TDA7461ND functionality in FM radio systems. | Select only if design uses separate stereo decoder (e.g., TDA7330) and does not require integrated multipath/noise suppression. |
| STA559BW | Digital audio processor with integrated Class-D amplifier; lacks analog MPX input, pilot tone PLL, and multipath detection circuitry. | Targeted at digital-input (I²S) systems; incompatible with analog FM front-end signal chain requirements. | Choose only for new designs migrating to digital audio sources and abandoning analog FM/AM tuner architectures. |
Compared with TDA7318 and STA559BW, the TDA7461ND uniquely combines analog FM signal processing, stereo decoding, and interference mitigation in one IC - making it irreplaceable for cost-optimized, analog-tuner-based automotive radios where integration density and RF robustness are critical.
Availability
TDA7461ND is available at Aetrix Electronics and suitable for OEM automotive radio head units, aftermarket stereo receivers, FM telematics modules, and legacy broadcast audio processor replacements requiring stable component supply and long-term manufacturing continuity.
Supply support for TDA7461ND 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 TDA7461ND belongs to ST's automotive audio processor product line, engineered specifically for analog FM/AM radio signal conditioning in vehicles - emphasizing RF noise resilience, thermal stability over −40°C to +85°C, and seamless integration with microcontroller-based radio control systems.
FAQ
Is the TDA7461ND still in production despite being marked "Not for New Design"?
Yes. STMicroelectronics continues manufacturing the TDA7461ND for existing programs and service parts. It remains available through authorized distributors and Aetrix Electronics with full traceability and guaranteed minimum order quantities for legacy program support.
What is the function of the CREF pin, and what capacitor value is required?
The CREF pin connects to an external 100 nF ceramic capacitor (X7R, 10% tolerance) that sets the internal clock frequency for all switched-capacitor filters. This capacitor stabilizes bass/treble/loudness center frequencies and ensures consistent filter Q-factor across temperature and voltage variations.
Can the TDA7461ND decode HD Radio or digital satellite radio signals?
No. The TDA7461ND processes only analog FM stereo (MPX), AM, CD, and cassette signals. It lacks digital demodulation blocks, OFDM decoders, or MPEG audio engines required for HD Radio, SiriusXM, or DAB - it is strictly an analog broadcast signal processor.
Does the noise blanker affect audio quality during normal operation?
No. The noise blanker activates only during transient RF interference events (e.g., ignition spikes). Its adaptive threshold and fast recovery (<100 µs) ensure zero audible artifacts during clean signal conditions - verified by THD+N measurements showing no degradation at rated output levels.
TDA7461ND Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Audio Signal Processor
- Applications:
- Audio
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 7.5V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7461ND FAQ
1.How can I place an order for TDA7461ND through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7461ND 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 TDA7461ND reliable?
The price and inventory of TDA7461ND are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7461ND is usually 5 days.
3.What payment methods are accepted for TDA7461ND?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7461ND transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7461ND?
TDA7461ND orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7461ND 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 TDA7461ND?
For technical support, including TDA7461ND datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7461ND requirements.
6.How does Aetrix verify that TDA7461ND is sourced from the original manufacturer or authorized distributors?
All TDA7461ND 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 TDA7461ND meets industry standards.
7.What is the process for return or replacement of TDA7461ND?
All TDA7461ND units undergo pre-shipment inspection (PSI). If there is an issue with TDA7461ND, 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 TDA7461ND part is unused and in its original packaging.
Return procedure for TDA7461ND:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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