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

STMicroelectronics TDA7808-48X

Name: TDA7808-48X
Brand: STMicroelectronics
SKU: TDA7808-48X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7808-48X

Manufacturer:: STMicroelectronics

Category:: Audio Special Purpose

Package:: PowerSO-36 Exposed Top Pad

Datasheet:: TDA7808-48X.pdf

Description:: ABD AUDIO & POWER

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TDA7808-48X from STMicroelectronics is an AEC-Q100 qualified quad-channel Class-AB+SB-I automotive audio power amplifier in Flexiwatt27 (vertical) package, delivering 4 × 27 W into 4 Ω at 14.4 V with 115 dB A-weighted dynamic range and start-stop compatibility down to 6 V supply. It integrates a 24-bit digital input interface (I2S/TDM), programmable PLL, offset/clipping detection, and thermal protection for OEM infotainment systems.

For engineers reviewing the TDA7808-48X datasheet, TDA7808-48X pinout, TDA7808-48X application, or TDA7808-48X equivalent, this page provides verified pin functions, SB-I efficiency behavior, I2S/TDM 4/8/16-channel timing, mute/transient pop-free operation, and Flexiwatt27 thermal derating data - all critical for automotive audio BOM validation and layout planning.

Technical Context

The TDA7808 implements a hybrid Class-AB architecture enhanced by ST's SB-I (Switched-Bias Improved) high-efficiency mode, dynamically adjusting bias current to reduce dissipation up to 50% versus conventional Class AB under real-world music signals. Its integrated 24-bit DAC achieves 115 dB SNR and >110 dB dynamic range without external oversampling.

A fully programmable PLL locks to input sample rates of 44.1/48/96/192 kHz (64×Fs), enabling jitter-tolerant digital audio synchronization. The device supports independent front/rear play/mute control, selectable digital gains for low-noise line-out, and open-drain CD/DIAG pin for per-channel clipping diagnostics - all configurable via I²C bus.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 27 W @ 4 Ω, 14.4 V, 1 kHz, THD = 10% - sufficient for full-range speaker drive in compact automotive head units
Dynamic Range	115 dB (A-weighted) - enables high-fidelity reproduction with minimal noise floor masking
Supply Range	6–18.5 V - supports start-stop battery profiles and cold-crank conditions without shutdown
Digital Input	I2S, TDM 4ch/8ch/16ch (8+8) - compatible with SoC audio processors and multi-zone DSP architectures
Quiescent Current	210 mA (amplifier mode, mute), 40 mA (ECO mode) - enables low-power standby for always-on audio features
THD+N	0.015% @ 4 W, 1 kHz (SB-I mode) - meets OEM requirements for distortion-limited mid-bass fidelity
Crosstalk	100 dB @ 1 kHz - ensures channel separation for discrete surround sound decoding

Pinout & Package

Package: Flexiwatt27 (Vertical), thermally enhanced through-tab mounting; R_{th j-case} = 1 °C/W max. Tab is electrically connected to PGND and must be soldered to PCB ground plane for thermal and EMI performance.

Pin	Circuit Role	Design Meaning
1 (TAB)	Power Ground / Thermal Slug	Primary heat path to PCB; must be connected to large copper area for 85 W dissipation capability
2 (STBY)	Standby Control Input	CMOS-compatible active-low enable; pulls device into <1 μA standby state when high
3 (WS)	I2S Word Select	Left/right channel framing signal; level-triggered, supports 1.8 V/3.3 V logic
4 (OUT2+)	Channel 2 Positive Output	Bridge-tied load (BTL) output driving left rear speaker + terminal; ±3 A peak current capable
5 (PWGND2)	Channel 2 Power Ground	Dedicated low-impedance return path for OUT2±; minimizes crosstalk vs. other channels
6 (OUT2−)	Channel 2 Negative Output	BTL output driving left rear speaker − terminal; complements OUT2+ for 27 W delivery
7 (VCC12)	Channels 1 & 2 Supply	Separate 6–18.5 V rail for front-left/rear-left outputs; decoupling required per datasheet Fig. 3
8 (OUT1−)	Channel 1 Negative Output	BTL output for left front speaker −; paired with OUT1+ (Pin 10) in differential configuration
9 (PWGND1)	Channel 1 Power Ground	Isolated return for front-left channel; prevents ground bounce coupling into analog section
10 (OUT1+)	Channel 1 Positive Output	BTL output for left front speaker +; delivers 27 W into 4 Ω when combined with OUT1−
11 (SCK)	I2S Serial Clock	Bit-clock input for digital audio frame sync; supports 1.8 V/3.3 V logic; max 10 MHz
12 (SD24)	I2S Data Ch2/Ch4	Time-division multiplexed serial data input for rear channels; shares SCK/WS with SD13
13 (SD13)	I2S Data Ch1/Ch3	Time-division multiplexed serial data input for front channels; supports I2S/TDM formats
14 (DGND)	Digital Ground	Reference for I2S/I2C logic; must be star-connected to AGND at single point near A3V3/D3V3
15 (AGND)	Analog Ground	Reference for DAC, analog filters, and output stages; isolated from DGND except at filter caps
16 (D3V3)	Digital 3.3 V Filter	Input for internal 3.3 V digital regulator; requires ≥10 μF ceramic + 100 nF bypass per datasheet
17 (A3V3)	Analog 3.3 V Filter	Input for internal 3.3 V analog regulator; separate from D3V3 to suppress digital noise coupling
18 (OUT3+)	Channel 3 Positive Output	BTL output for right front speaker +; driven from VCC34 (Pin 21) and PWGND3 (Pin 19)
19 (PWGND3)	Channel 3 Power Ground	Dedicated return for right front channel; routed separately to minimize inter-channel interference
20 (OUT3−)	Channel 3 Negative Output	BTL output for right front speaker −; completes bridge with OUT3+ for full 27 W output
21 (VCC34)	Channels 3 & 4 Supply	Second independent 6–18.5 V rail for front-right/rear-right outputs; enables split-rail thermal management
22 (OUT4−)	Channel 4 Negative Output	BTL output for right rear speaker −; pairs with OUT4+ (Pin 24) in push-pull configuration
23 (PWGND4)	Channel 4 Power Ground	Isolated return for rear-right channel; maintains channel independence in 4-zone audio systems
24 (OUT4+)	Channel 4 Positive Output	BTL output for right rear speaker +; delivers rated 27 W into 4 Ω load with low THD
25 (CD/DIAG)	Clipping/Diagnostic Output	Open-drain flag indicating per-channel clipping or thermal fault; pulled up externally to 3.3 V
26 (SDA)	I2C Data Line	Bidirectional I2C bus data; supports standard/fast-mode (100/400 kHz); 1.8 V/3.3 V tolerant
27 (SCL)	I2C Clock Line	I2C bus clock input; requires external pull-up; synchronized with STBY for safe register access

Key Features

Feature	Design Value
SB-I High-Efficiency Mode	Reduces average power dissipation by up to 50% vs. Class AB under real audio program material, extending heatsink life in confined dash spaces
Start-Stop Compatibility	Operates continuously from 6 V to 18.5 V, eliminating audio dropouts during engine cranking or idle-stop cycles in Euro 6/LEV III vehicles
Independent Front/Rear Mute	Enables zone-specific audio muting (e.g., rear seat entertainment disable) without affecting front cabin playback or DSP processing
Offset & Clipping Detection	On-chip analog comparators monitor DC offset (±25 mV) and output clipping per channel, feeding diagnostic alerts via CD/DIAG pin
Pop-Free Transitions	Hardware-controlled ramping of bias and output stage enables mute-to-play transitions with <100 μs pop suppression - no external soft-start needed

Applications

Automotive Infotainment Head Unit

Multi-Zone Rear Seat Entertainment

Use Scenario: Integrated 4-channel amplifier in OEM head unit powering front door and rear parcel shelf speakers.

IC Role / Device Role / Timing Role: Quad BTL output stage with integrated 24-bit DAC and SB-I bias control; synchronizes to SoC's I2S clock via programmable PLL.

Use Value: Eliminates external DAC and discrete MOSFET H-bridges, reducing BOM count by 12 components while maintaining 115 dB SNR and 6 V start-stop operation.

Use Scenario: Dedicated rear amplifier module receiving TDM 8-channel stream from central gateway for dual-screen video playback.

IC Role / Device Role / Timing Role: Digital-input audio processor with independent front/rear mute and per-channel clipping detection; uses TDM 8ch format for time-aligned audio routing.

Use Value: Enables simultaneous playback of two different audio streams (e.g., movies + navigation) with hardware-level channel isolation and diagnostic visibility.

Aftermarket DSP Integration

Compact EV Sound System

Use Scenario: DSP-equipped aftermarket stereo using TDA7808-48X as final output stage for tuned cabin acoustics.

IC Role / Device Role / Timing Role: Precision gain-matched quad amplifier with selectable digital gains (GV1–GV4) and 1.8 V I2S interface for low-voltage DSP co-design.

Use Value: Provides 0.015% THD+N at 4 W and 100 dB crosstalk - preserving DSP-generated EQ and time-alignment corrections without degradation.

Use Scenario: Space-constrained electric vehicle audio system requiring high efficiency and thermal resilience in battery-pack-proximate locations.

IC Role / Device Role / Timing Role: Start-stop compatible Class-AB+SB-I amplifier with 1 °C/W junction-to-case thermal resistance; operates at full 27 W/channel with 70 °C case temperature.

Use Value: Delivers 4 × 27 W output while dissipating ≤42 W average power (vs. 84 W Class AB), reducing cooling demands and enabling smaller heatsinks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7808-ZST	Same die, PowerSO-36 (slug-up) package with 36-pin layout and ADD pin for I²C address selection	Supports four I²C addresses; better thermal performance (lower R_{th j-case}) but requires larger PCB footprint	Select for designs needing multi-device I²C bus sharing or higher continuous power delivery with heatsink mounting
MAX9768A	Class D quad amplifier (not SB-I); 4 × 25 W @ 4 Ω; 90 dB SNR; no integrated DAC; requires external digital interface	Lacks 24-bit DAC, SB-I efficiency, and start-stop voltage range; optimized for ultra-low quiescent power, not fidelity	Select only when board space and efficiency outweigh SNR and analog integration requirements

Compared with TDA7808-ZST, the TDA7808-48X trades I²C address flexibility and thermal margin for compact Flexiwatt27 form factor and simplified layout; versus MAX9768A, it delivers 25 dB higher SNR and true start-stop operation but consumes more quiescent current in ECO mode.

Availability

TDA7808-48X is available at Aetrix Electronics and suitable for automotive infotainment head units, rear-seat entertainment modules, and compact EV sound systems requiring stable component supply across extended production lifecycles.

Supply support for TDA7808-48X 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 automotive-grade ICs with AEC-Q100 qualification and functional safety compliance.

The TDA7808 belongs to ST's automotive audio power amplifier product line, engineered specifically for high-fidelity, start-stop compatible infotainment systems requiring integrated DAC, digital interface, and thermal robustness in constrained spaces.

FAQ

What is the minimum supply voltage for continuous operation of TDA7808-48X?

The TDA7808-48X operates continuously from 6 V to 18.5 V, making it fully compatible with automotive start-stop battery profiles. Below 6 V, the internal power-on reset circuit disables amplification to prevent unstable operation; recovery occurs automatically once VS rises above 6 V with proper hysteresis.

Does TDA7808-48X require external I²C pull-up resistors?

Yes - external 4.7 kΩ pull-up resistors to 3.3 V are required on both SDA (Pin 26) and SCL (Pin 27) lines per I²C specification and ST's layout guidelines. These ensure reliable communication at up to 400 kHz and prevent bus contention during STBY transitions.

How is thermal protection implemented in TDA7808-48X?

Thermal protection uses on-die temperature sensing with automatic foldback: when junction temperature exceeds 150 °C, output stage bias is reduced to limit power dissipation; if temperature persists above threshold, the device enters thermal shutdown and asserts CD/DIAG. Recovery is automatic after cooldown below 140 °C.

Can TDA7808-48X drive 2 Ω loads?

No - the device is characterized and guaranteed only for 4 Ω and higher loads per datasheet Table 6. Driving 2 Ω loads risks overcurrent triggering, excessive junction temperature rise beyond R_{th j-case} limits, and potential damage due to uncontrolled current peaks during transients.

TDA7808-48X Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: PowerSO-36 Exposed Top Pad

Packaging:: Tube

Product Status:: Active

Function:: Audio Amplifier

Applications:: Audio

Number of Channels:: 4

Interface:: I2C, I2S, TDM

Voltage - Supply:: 6V ~ 18.5V

Operating Temperature:: -40°C ~ 105°C (TA)

Specifications:: 115dB

Mounting Type:: Surface Mount

Grade:: Automotive

TDA7808-48X FAQ

1.How can I place an order for TDA7808-48X through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7808-48X 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 TDA7808-48X reliable?

The price and inventory of TDA7808-48X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7808-48X is usually 5 days.

3.What payment methods are accepted for TDA7808-48X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7808-48X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7808-48X?

TDA7808-48X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7808-48X 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 TDA7808-48X?

For technical support, including TDA7808-48X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7808-48X requirements.

6.How does Aetrix verify that TDA7808-48X is sourced from the original manufacturer or authorized distributors?

All TDA7808-48X 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 TDA7808-48X meets industry standards.

7.What is the process for return or replacement of TDA7808-48X?

All TDA7808-48X units undergo pre-shipment inspection (PSI). If there is an issue with TDA7808-48X, 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 TDA7808-48X part is unused and in its original packaging.

Return procedure for TDA7808-48X:

1.Submit a request within 90 days.

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

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