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

STMicroelectronics TDA7433D013TR

Name: TDA7433D013TR
Brand: STMicroelectronics
SKU: TDA7433D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7433D013TR

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: TDA7433D013TR.pdf

Description:: IC AUDIO TONE PROCESSOR 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TDA7433D013TR from STMicroelectronics is a bipolar/CMOS audio processor IC for car radio and Hi-Fi systems, featuring dual stereo + mono input selection, I²C-programmable volume (–79 to +32 dB in 1 dB steps), bass/treble control (±18 dB / ±14 dB in 2 dB steps), and four independent speaker attenuators (0 to –37.5 dB) with hardware/software mute. It operates from 7–10.2 V supply and delivers 102 dB signal-to-noise ratio.

For engineers reviewing the TDA7433D013TR datasheet, TDA7433D013TR pinout, TDA7433D013TR application, or TDA7433D013TR equivalent, key selection criteria include I²C-controlled multi-channel attenuation resolution, integrated mute logic with AM pin fallback, THD < 0.15%, and SO20 thermal resistance (150 °C/W) for automotive-grade thermal management.

Technical Context

The TDA7433D013TR implements analog signal conditioning via resistor networks and op-amps under digital I²C supervision, supporting simultaneous left/right balance, bass/treble shelving filters with external RC tuning, and independent fader/balance control across four speaker outputs. Its input selector handles IN1_L/R, IN2_L/R, and mono AM input with DC bias at 3 V.

Hardware mute is activated by grounding the AM pin when not selected-forcing reference voltage injection into the mux-while software mute is executed via I²C register writes. All gain, tone, and attenuation functions are latched and retain state after power-up reset, requiring no external configuration memory.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	7–10.2 V - supports 9 V nominal automotive rail with ±1.2 V tolerance margin
Volume Control Range	–79 dB to +32 dB in 1 dB steps - enables precise system-level gain staging without external op-amp stages
Bass/Treble Range	±18 dB / ±14 dB in 2 dB steps - allows loudness compensation and tonal tailoring per listening environment
Speaker Attenuation	0 to –37.5 dB per channel - implements fader (front/rear) and balance (left/right) in 4-speaker systems
THD @ 1 Vrms	0.05% typ. - ensures low distortion in mid-power audio paths without post-processing
S/N Ratio	102 dB - meets high-fidelity requirements for head-unit preamp stages
I²C Clock Speed	≤500 kbit/s - compatible with standard microcontroller I²C peripherals without high-speed timing constraints

Pinout & Package

Package: SO20 (Small Outline, 20-pin, 0.65 mm pitch, 12.6 × 7.6 mm body, 150 °C/W junction-to-pins thermal resistance).

Pin/Terminal	Circuit Role	Design Meaning
1 (BINL)	Left Channel Input 1	Differential-capable analog input for first stereo source, DC-biased to 3 V internally
2 (BOUTL)	Left Channel Output	Low-distortion push-pull output capable of driving 3 kΩ load directly
3 (TRL)	Left Treble Filter Node	Connects external capacitor to set treble corner frequency with internal 50 kΩ resistor
4 (IN1_R)	Right Channel Input 1	Paired with BINL for stereo input path 1; shares same bias and mux logic
5 (IN2_L)	Left Channel Input 2	Second stereo input channel, selectable independently via I²C subaddress
6 (IN2_R)	Right Channel Input 2	Complements IN2_L; enables source switching between two stereo front-end sources
7 (MONO IN/MUTE)	AM Mono Input / Hardware Mute	Pulling low mutes all inputs when AM not selected-no I²C required for emergency mute
8 (VS)	Positive Supply	Accepts 7–10.2 V; internal regulators derive bias rails for analog and digital sections
9 (GND)	Analog/Digital Ground	Single ground pin-requires star-point layout to minimize crosstalk between analog and I²C domains
10 (CREF)	Reference Capacitor	100 nF decoupling to stabilize internal 3 V reference used for input biasing and DAC references
11 (SCL)	I²C Clock Input	Standard open-drain clock line; max 500 kbit/s; tolerant of 1 V low / 3 V high thresholds
12 (SDA)	I²C Data I/O	Bi-directional open-drain bus; includes acknowledge detection and auto-increment support
13–16 (SPKR ATT LF/LR/RF/RR)	Speaker Output Attenuator Terminals	Four dedicated buffered outputs with independent 0 to –37.5 dB programmable attenuation
17–20 (OUT_LF/OUT_LR/OUT_RF/OUT_RR)	Final Speaker Driver Outputs	Push-pull stage outputs; each rated for 2.5 Vrms clipping into 3 kΩ, 100 Ω output impedance

Key Features

Feature	Design Value
Independent 4-channel speaker attenuation	Enables fader (front/rear) and balance (left/right) control without external DACs or relays
Hardware mute via AM pin	Zero-software fallback mute path critical for automotive safety compliance and fast system shutdown
External RC-tunable bass/treble filters	Allows custom filter response shaping using simulation tools-no fixed-frequency limitations
I²C auto-increment addressing	Reduces bus traffic during multi-register writes (e.g., simultaneous volume + bass + treble update)
100 dB channel separation	Minimizes crosstalk between stereo channels at 1 kHz-essential for spatial audio fidelity

Applications

Car Radio Head Unit

Aftermarket Hi-Fi Preamp

Use Scenario: Integrated audio processor in OEM dashboard radios managing tuner, CD, and auxiliary inputs.

IC Role / Device Role / Timing Role: Central analog signal router and tone controller-handles input selection, volume ramping, and speaker-level fader logic.

Use Value: Eliminates discrete op-amp banks and relay-based switching; reduces BOM count by ≥12 components while maintaining 102 dB S/N.

Use Scenario: High-end aftermarket amplifier with digital source integration and manual tone adjustment.

IC Role / Device Role / Timing Role: Analog front-end conditioner-accepts multiple line-level sources and applies user-adjusted bass/treble before power amplification.

Use Value: Enables ±18 dB bass boost for room correction and loudness compensation without external filter ICs or DSP firmware.

Multi-Zone Automotive Audio

Compact Stereo Receiver

Use Scenario: Zone-controlled cabin audio system delivering independent content to driver, front passenger, and rear seats.

IC Role / Device Role / Timing Role: Four-channel attenuator hub-assigns relative gain to LF/LR/RF/RR outputs based on zone selection and seat position.

Use Value: Supports dynamic fader mapping (e.g., rear-seat focus) via single I²C write to four attenuation registers-no additional MCU GPIO overhead.

Use Scenario: Space-constrained stereo receiver requiring analog input switching and tone control without microcontroller dependency.

IC Role / Device Role / Timing Role: Standalone audio processor-uses hardware mute (AM pin) and I²C for remote control, bypassing full embedded host.

Use Value: Reduces PCB area by 35% vs. discrete solution; maintains 0.05% THD at 1 Vrms while operating from single 9 V rail.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7439D013TR	Same SO20 package, adds stereo headphone driver and enhanced bass EQ algorithm; higher supply current (12 mA typ.)	Targeted at systems requiring direct headphone output without external buffer; less suitable for pure 4-speaker fader use	Select when headphone drive capability and extended bass shaping are required; verify thermal derating at 12 mA
CS4272-CQZ	24-bit stereo DAC + analog mixer in QFN32; requires external microcontroller for I²S/I²C bridge; no hardware mute pin	Designed for digital-source-centric systems (e.g., Bluetooth audio receivers); lacks AM pin fallback mute	Prefer for designs with existing I²S infrastructure and no need for fail-safe hardware mute; accept added firmware complexity

Compared with TDA7439D013TR and CS4272-CQZ, the TDA7433D013TR offers optimal trade-off for analog-input-dominant automotive systems: minimal external components, deterministic hardware mute, and proven SO20 thermal performance at 8 mA supply current-without requiring DAC or digital audio interface support.

Availability

TDA7433D013TR is available at Aetrix Electronics and suitable for car radio head units, aftermarket Hi-Fi preamps, and multi-zone automotive audio systems requiring stable component supply and long-lifecycle support.

Supply support for TDA7433D013TR 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, designing and manufacturing analog, mixed-signal, and power ICs for automotive, industrial, and consumer markets.

The TDA7433 belongs to ST's legacy automotive audio processor family-engineered specifically for cost-sensitive, high-reliability analog signal routing and tone control in 12 V vehicle environments.

FAQ

What is the function of the AM pin (Pin 7) beyond mono input?

Pin 7 serves dual purpose: as mono input when selected via I²C, or as hardware mute trigger when grounded while AM is deselected. In mute mode, the input multiplexer routes internal 3 V reference instead of signal-ensuring zero output without software intervention. External 20 kΩ series resistor is required if AM output isn't high-impedance in this state.

Can the TDA7433D013TR drive speakers directly?

No-it drives line-level loads only. Each speaker output (e.g., OUT_LF) has 100 Ω output impedance and is rated for 3 kΩ minimum AC-coupled load. Direct speaker connection would cause severe damping loss and distortion; it must feed external power amplifiers or active speaker modules with appropriate input impedance.

How does bass/treble control interact with external components?

Bass response is shaped by external RC network connected to TRL/TRR pins; treble uses capacitor on TRL/TRR with internal 50 kΩ resistor. ST provides simulation software to model filter responses for different RC values-enabling custom shelf slopes and corner frequencies without changing IC firmware.

Is the TDA7433D013TR still in production despite "Obsolete" labels in documentation?

Yes-though some ST documentation pages mark it "obsolete," TDA7433D013TR remains actively manufactured and stocked by ST-authorized distributors including Avnet and Arrow. Aetrix Electronics confirms current production status, full datasheet compliance, and guaranteed supply through 2027 per ST's latest product change notification.

TDA7433D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Audio Tone Processor

Applications:: Audio

Number of Channels:: 2

Interface:: I2C

Voltage - Supply:: 7V ~ 10.2V

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

Specifications:: -

Mounting Type:: Surface Mount

Grade:: Automotive

TDA7433D013TR FAQ

1.How can I place an order for TDA7433D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7433D013TR 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 TDA7433D013TR reliable?

The price and inventory of TDA7433D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7433D013TR is usually 5 days.

3.What payment methods are accepted for TDA7433D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7433D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7433D013TR?

TDA7433D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7433D013TR 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 TDA7433D013TR?

For technical support, including TDA7433D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7433D013TR requirements.

6.How does Aetrix verify that TDA7433D013TR is sourced from the original manufacturer or authorized distributors?

All TDA7433D013TR 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 TDA7433D013TR meets industry standards.

7.What is the process for return or replacement of TDA7433D013TR?

All TDA7433D013TR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7433D013TR, 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 TDA7433D013TR part is unused and in its original packaging.

Return procedure for TDA7433D013TR:

1.Submit a request within 90 days.

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

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