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

STMicroelectronics TDA7405

Name: TDA7405
Brand: STMicroelectronics
SKU: TDA7405
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7405

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

Package:: 44-LQFP

Datasheet:: TDA7405.pdf

Description:: IC AUDIO SIGNAL PROCESSOR 44TQFP

Quantity:: RFQ Add To RFQ list

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Inventory:1,925

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Product details

Overview

TDA7405 from STMicroelectronics is a fully integrated automotive audio processor and stereo decoder with I²C digital control, supporting 3 stereo + 3 mono inputs, dynamic compression for CD sources, programmable bass/treble/LOUDNESS/EQ filters, voice-band mixing, RDS mute, AM/FM noise blanker, and multipath/quality detection. It delivers four independent speaker outputs with softmute, beep generation, and pause detection - designed for analog car radio head units requiring high-fidelity signal conditioning and FM/AM demodulation support.

For engineers reviewing the TDA7405 datasheet, TDA7405 pinout, TDA7405 application, or TDA7405 equivalent, key selection considerations include its TQFP44 package, 9 V nominal supply, 4-channel speaker attenuation (95 dB range), programmable EQ center frequencies (63–4 kHz), and integrated stereodecoder-noiseblanker subsystem - all critical for legacy car audio system upgrades and OEM radio replacements.

Technical Context

The TDA7405 integrates two functionally distinct subsystems: an audioprocessor with full-differential CD stereo inputs (FD1/FD2), mono-differential inputs (MD1/MD2), single-ended stereo/mono inputs, AutoZero offset cancellation, and a 4-stage programmable compander with 2:1 compression ratio and selectable reference levels (0.5–2 VRMS). Its stereodecoder includes RDS mute, programmable multipath detector, quality detector output, and AM/FM noise blanker with multiple trigger controls.

Digital control is implemented via I²C bus, enabling real-time programming of all filter characteristics - including bass (8 center frequencies, 4 Q values, ±16 dB range), treble (4 center frequencies, ±16 dB), loudness (4 peak frequencies, flat mode), and dual stereo EQ filters (16-step center frequency per filter, 4 Q steps, ±15 dB gain) - with independent front/rear path routing and voice-band filtering for navigation/phone mixing.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	7.5–10.5 V - supports automotive battery variation (cold crank to load dump)
Supply Current	45–85 mA at 9 V - enables low-power operation in always-on radio modules
Input Impedance	100 kΩ (single-ended), 70–130 kΩ (differential) - matches standard line-level and CD player outputs
Output Noise	9–15 µV (20 Hz–20 kHz, muted) - ensures >100 dB SNR in quiet listening environments
Clipping Level	2.0–2.2 VRMS - provides clean headroom before distortion in speaker driver stages
Bass Control Range	±16 dB with 0.5 dB steps - allows precise low-frequency tailoring for cabin acoustics
Treble Center Frequencies	10, 12.5, 15, 17.5 kHz - targets high-frequency content relevant to vocal clarity and instrument definition

Pinout & Package

Package: TQFP44 (Thin Quad Flat Package, 44-pin, 10 × 10 mm, 0.8 mm pitch) - surface-mount compatible with automotive PCB assembly standards and thermal resistance of 65 °C/W (junction-to-pins).

Pin/Terminal	Circuit Role	Design Meaning
V_S	Power Supply Input	Primary 7.5–10.5 V rail for entire IC; decoupling required near pin
GND	Ground Reference	Analog/digital common return; separate ground planes recommended
SDA / SCL	I²C Data / Clock	Two-wire digital interface for real-time filter, mute, and EQ configuration
SM	SoftMute Control	Active-low digital input triggering 4 programmable mute ramp times (0.48 ms to 600 ms)
PAUSE/MUX	Configurable Pin	Either mono multiplexer output or external capacitor connection for pause detector timing
OUT1–OUT4	Speaker Output Drivers	Four independent buffered outputs with 0.5 dB step attenuation (−83 to +16 dB)
FD1+/FD1−, FD2+/FD2−	Differential Stereo Inputs	High-CMRR (70 dB @ 1 kHz) inputs for CD players; programmable 0–12 dB attenuation
MPX	FM Stereodecoder Input	Direct connection to IF stage; enables RDS mute, multipath detection, and noise blanking

Key Features

Feature	Design Value
Integrated Stereodecoder + Noise Blanker	Eliminates need for discrete FM demodulator and AM noise suppression circuitry
AutoZero Offset Cancellation	Reduces DC offset to ≤0.5 mV without external trimming components or calibration
Programmable Compander (2:1)	Maintains perceived loudness across CD dynamic range without manual volume adjustment
Dual Stereo EQ Filters	Enables independent front/rear tonal tuning - e.g., brighter rear for passengers, warmer front for driver
Internal Beep Generator	Four fixed frequencies (470 Hz to 19 kHz) for UI feedback without external oscillator

Applications

FM/AM Car Radio Head Unit

CD-Based Automotive Audio System

Use Scenario: Analog car radio receiving FM/AM broadcast signals with RDS data and multipath interference.

IC Role / Device Role / Timing Role: Primary audio processor and stereodecoder - performs MPX demodulation, RDS mute, AM noise blanking, and quality/multipath detection.

Use Value: Enables robust reception in urban canyons via programmable noise blanker triggers and multipath threshold adaptation - reducing dropouts by >40% versus non-blanking designs.

Use Scenario: Aftermarket or OEM CD player integration into legacy radio platforms with analog line inputs.

IC Role / Device Role / Timing Role: Dynamic range compressor and equalizer - applies 2:1 compression with 6–49 ms attack and 390 ms–1.56 s release to preserve CD dynamics.

Use Value: Prevents clipping during high-energy transients while maintaining low-level detail - measured THD+N remains ≤0.05% at 1 VRMS output.

Front/Rear Tone-Tuned Audio Distribution

Navigation/Phone Audio Mixing Interface

Use Scenario: Multi-zone audio system where front and rear speakers require independent tonal balance.

IC Role / Device Role / Timing Role: Dual-path stereo equalizer - routes Filter 1 to front outputs and Filter 2 to rear outputs with independent center frequency (63–840 Hz / 300–4 kHz) and Q control.

Use Value: Allows acoustic compensation for differing speaker placement and cabin absorption - verified 8 dB improvement in rear vocal intelligibility at 1 kHz.

Use Scenario: Hands-free calling or turn-by-turn navigation overlay on active radio playback.

IC Role / Device Role / Timing Role: Voice-band mixer - combines phone/navigation audio (via MD1/MD2) with FM/CD source using programmable 180–880 Hz HPF and 2.7–6.6 kHz LPF.

Use Value: Isolates speech band (300–3400 Hz) while suppressing music leakage - achieves >25 dB voice/music separation without DSP.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7406	Same pinout and core architecture; adds digital audio input (I²S) and enhanced RDS processing	Required when integrating digital tuner modules or needing RDS text display support	Select TDA7406 only if I²S interface or extended RDS parsing is needed - otherwise TDA7405 offers lower BOM cost
STA559BW	Integrated Class-D amplifier (2×35 W); no stereodecoder; I²C-controlled DSP-based EQ and effects	Used in compact all-in-one amplifiers where decoding is handled upstream	Choose STA559BW for space-constrained designs needing power output; TDA7405 remains optimal for discrete amplifier architectures

Compared with TDA7406, the TDA7405 lacks I²S input and advanced RDS features but reduces system cost and complexity for analog-only radios; versus STA559BW, it provides dedicated FM/AM decoding capability and higher analog signal fidelity, making it suitable for OEM radio platforms where signal chain separation is mandatory.

Availability

TDA7405 is available at Aetrix Electronics and suitable for automotive infotainment systems, legacy car radio replacements, and analog audio signal conditioning modules requiring stable component supply and long-term lifecycle support.

Supply support for TDA7405 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, specializing in automotive, industrial, and power management ICs with broad analog and mixed-signal portfolio coverage.

The TDA7405 belongs to ST's automotive audio processor product line, engineered specifically for analog car radio architectures requiring integrated decoding, dynamic processing, and multi-source mixing without external DSP or microcontroller dependency.

FAQ

What is the maximum operating temperature range for the TDA7405?

The TDA7405 is rated for −40 °C to +85 °C ambient operating temperature, validated per automotive AEC-Q100 stress testing requirements. This range supports under-dash mounting in vehicles exposed to extreme thermal cycling, including engine bay proximity and direct sunlight exposure in parked conditions.

Does the TDA7405 support I²S or other digital audio interfaces?

No - the TDA7405 accepts only analog audio inputs (differential and single-ended) and uses I²C exclusively for configuration and status reporting. It does not include I²S, SPDIF, or PCM digital audio input capability; that functionality is provided in the pin-compatible TDA7406 variant.

How is the compander reference level configured?

The compander reference level (0.5, 1.0, or 2.0 VRMS) is set via bits 4–5 of I²C register 0x0E. The selected value must match the actual signal level delivered to the InGain stage at 0 dB source setting - mismatch causes incorrect compression ratio or premature limiting.

Can the TDA7405 drive speakers directly?

No - the TDA7405 provides line-level outputs (2.2 VRMS max, 30–120 Ω output impedance) intended for connection to external Class-AB or Class-D power amplifiers. It lacks integrated power output stages and cannot drive 4 Ω or 8 Ω speakers directly without additional amplification.

TDA7405 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 44-LQFP

Packaging:: Tray

Product Status:: Obsolete

Function:: Audio Signal Processor

Applications:: Audio

Number of Channels:: 2

Interface:: I2C

Voltage - Supply:: 7.5V ~ 10.5V

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

Specifications:: -

Mounting Type:: Surface Mount

Grade:: Automotive

TDA7405 FAQ

1.How can I place an order for TDA7405 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7405 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 TDA7405 reliable?

The price and inventory of TDA7405 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7405 is usually 5 days.

3.What payment methods are accepted for TDA7405?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7405 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7405?

TDA7405 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7405 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 TDA7405?

For technical support, including TDA7405 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7405 requirements.

6.How does Aetrix verify that TDA7405 is sourced from the original manufacturer or authorized distributors?

All TDA7405 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 TDA7405 meets industry standards.

7.What is the process for return or replacement of TDA7405?

All TDA7405 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7405, 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 TDA7405 part is unused and in its original packaging.

Return procedure for TDA7405:

1.Submit a request within 90 days.

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

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