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STMicroelectronics TDA7803A-8ZX
- Part No.:
- TDA7803A-8ZX
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 27-Flexiwatt, Formed Leads
- Datasheet:
-
TDA7803A-8ZX.pdf
- Description:
- HIGH EFFICIENCY DIGITAL INPUT AU
- Quantity:
- Payment:
- Shipping:
Inventory:3,812
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Product details
Overview
TDA7803A-8ZX from STMicroelectronics is an AEC-Q100 qualified automotive quad bridge Class-SBI digital input power amplifier with integrated 24-bit DAC, diagnostics, and start-stop battery compatibility. It delivers 4 × 27 W into 4 Ω and 4 × 47 W into 2 Ω at 14.4 V, supports I2S/TDM up to 192 kHz, and operates down to 6 V supply-enabling robust audio amplification in modern vehicle infotainment systems.
For engineers reviewing the TDA7803A-8ZX datasheet, TDA7803A-8ZX pinout, TDA7803A-8ZX application, or TDA7803A-8ZX equivalent, this page provides verified technical context, validated pin functions, confirmed diagnostic capabilities, and real-world automotive use cases aligned with OEM start-stop requirements and EMI-sensitive cabin layouts.
Technical Context
The TDA7803A-8ZX integrates a full 24-bit D/A converter and four high-efficiency MOSFET output stages in BCD technology, achieving 115 dB A-weighted dynamic range and >110 dB SNR. Its SB-I (SB-improved) architecture dynamically adjusts rail voltage to reduce average power dissipation by up to 50% versus Class AB under real audio program conditions.
It features a programmable PLL locking to 64×Fs input clocks across all supported sample rates (44.1/48/96/192 kHz), independent front/rear clipping detection, DC/AC load diagnostics per channel via I²C, and a CMOS-compatible enable pin for seamless integration into low-voltage automotive power domains.
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 head units without external heatsinking. |
| Dynamic Range | 115 dB (A-weighted) - enables high-fidelity reproduction of quiet passages alongside loud transients in cabin environments. |
| Supply Voltage Range | 6 V to 18.5 V - ensures uninterrupted operation during engine cranking and start-stop cycles per ISO 16750-2. |
| Digital Input Support | I²S, TDM 4/8/16-ch (8+8) at 1.8 V / 3.3 V logic - allows direct connection to DSPs, SoCs, or audio processors without level-shifting. |
| Diagnostics | Per-channel DC/AC load detection, offset detection, thermal muting, and double-fault prioritization - reduces need for external protection circuitry and simplifies fault logging. |
| Efficiency Architecture | SB-I (SB-improved) Class-G-like rail modulation - cuts average dissipation by ~50% vs. Class AB under music signals, lowering thermal design burden. |
| Sample Rates | 44.1 kHz, 48 kHz, 96 kHz, 192 kHz - supports CD-quality to high-res audio playback in premium OEM systems. |
Pinout & Package
Package: Flexiwatt 27 (vertical), thermally enhanced through-hole package with exposed slug for direct PCB heatsinking. Pin count: 27. Mounting orientation: vertical (leads perpendicular to board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main supply input | Accepts 6–18.5 V; powers internal regulators and output stage; requires local 100 nF + 10 µF decoupling. |
| GND | Power ground | Dedicated low-impedance return path for output current; must be connected to thermal pad and chassis ground at single point. |
| OUT1–OUT4 | Bridge outputs | Four differential speaker outputs; each capable of ±10.5 V swing into 2 Ω with <0.01% THD+N at mid-power. |
| SDA/SCL | I²C interface | 1.8 V / 3.3 V tolerant; used for configuration, diagnostics readback, and gain/dynamic control; supports four slave addresses. |
| EN | CMOS enable input | Active-high logic control; transitions mute/unmute with pop-free ramping; compatible with microcontroller GPIOs. |
| DIAG | Programmable diagnostic output | Open-drain status flag indicating fault condition (e.g., thermal shutdown, short circuit); configurable via I²C register DB7. |
| CLK/MCLK | Master clock input | Accepts 64×Fs clock (e.g., 3.072 MHz for 48 kHz); required for PLL lock and synchronous data sampling. |
Key Features
| Feature | Design Value |
|---|---|
| Start-stop compatibility | Operates continuously from 6 V supply - eliminates audio dropouts during engine restart in hybrid/EV platforms. |
| Independent front/rear mute control | Enables zone-based audio management (e.g., rear-seat entertainment mute without affecting driver display audio). |
| Digital gain programming | Adjustable per-channel digital gain (±24 dB in 0.5 dB steps) - preserves analog signal integrity while optimizing SNR for line-out paths. |
| Offset detector | Monitors DC bias on each output; triggers diagnostic alert before speaker damage occurs from sustained DC offset. |
| Thermal protection with muting | Reduces output power progressively before hard shutdown - maintains audio continuity during transient thermal overload. |
Applications
| Infotainment Head Unit | Driver Assistance Audio Alert System |
|---|---|
Use Scenario: Integrated audio subsystem in OEM 10-inch touchscreen head unit with Android Automotive OS. IC Role / Device Role / Timing Role: Quad-channel amplifier driving front left/right and rear left/right speakers with independent digital gain and mute control. Use Value: 115 dB dynamic range preserves voice clarity in navigation prompts; SB-I efficiency reduces heat buildup inside sealed dashboard enclosure. |
Use Scenario: Safety-critical audio feedback for lane departure warning, blind-spot detection, and ADAS alerts. IC Role / Device Role / Timing Role: Dedicated dual-channel mode (front pair only) with fast mute/unmute (<5 ms) and guaranteed 6 V operation during ignition transition. Use Value: Pop-free transitions prevent false auditory distraction; diagnostic reporting via I²C enables real-time health monitoring in ASIL-B compliant software stacks. |
| Rear Seat Entertainment (RSE) | Compact Premium Soundbar Module |
Use Scenario: Dual-zone RSE system with HDMI ARC input and Bluetooth streaming, mounted behind rear headrests. IC Role / Device Role / Timing Role: Full quad-mode amplifier with TDM 8-channel input supporting discrete left/right/rear/surround decoding. Use Value: 4 × 47 W into 2 Ω drives high-sensitivity coaxial speakers without external boost; flexible I²C address selection enables daisy-chained multi-amplifier configurations. |
Use Scenario: Space-constrained soundbar for EV cockpit with integrated subwoofer and tweeter array. IC Role / Device Role / Timing Role: Parallel mode configuration (two channels bridged per side) delivering 2 × 94 W into 4 Ω load with shared thermal management. Use Value: Flexiwatt 27 vertical mounting enables direct heatsink attachment; start-stop compatibility ensures silent boot-up during vehicle wake-from-sleep sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel automotive amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7802TR | 3-channel variant (2× front + 1× subwoofer); no TDM 16-ch support; lower max output (4×15 W @ 4 Ω). | Limited to basic 2.1 audio systems; lacks independent rear mute and AC load diagnostics. | Select when cost-sensitive entry-level infotainment requires reduced channel count and simplified diagnostics. |
| MAX9744ASA+ | Class D, not Class-SBI; 4×20 W @ 4 Ω; no integrated DAC; requires external I²S-to-analog conversion. | No native digital input processing; higher THD+N (>0.03%) and lower dynamic range (105 dB). | Choose only if legacy analog audio path exists and thermal budget permits higher dissipation than SB-I architecture. |
Compared with TDA7803A-8ZX, the TDA7802TR sacrifices channel flexibility and diagnostic depth for cost reduction, while the MAX9744ASA+ trades integrated signal chain simplicity and efficiency for raw Class D switching performance-making the TDA7803A-8ZX optimal for new designs demanding start-stop resilience, high fidelity, and embedded diagnostics.
Availability
TDA7803A-8ZX is available at Aetrix Electronics and suitable for automotive infotainment head units, ADAS audio alert subsystems, and rear-seat entertainment modules requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TDA7803A-8ZX 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 deep expertise in AEC-Q100 qualification and functional safety.
The TDA7803A belongs to ST's automotive audio amplifier product line, designed specifically for next-generation vehicle infotainment systems requiring high-efficiency digital-input amplification, comprehensive diagnostics, and seamless integration with start-stop battery profiles.
FAQ
What is the minimum supply voltage for reliable operation of the TDA7803A-8ZX?
The TDA7803A-8ZX operates reliably down to 6 V, enabling continuous audio playback during engine cranking and start-stop cycles. Below 6 V, the device enters undervoltage lockout (UVLO) and disables outputs to protect speakers and internal circuitry. This threshold is factory-trimmed and specified per ISO 16750-2 Annex C.
Does the TDA7803A-8ZX support TDM 16-channel input, and how is it configured?
Yes, the TDA7803A-8ZX supports TDM 16-channel input (8+8 format) via its flexible serial port. Configuration is done through I²C register IB0 bit 4 (TDM_EN) and IB1 bits [2:0] (TDM_MODE). The device accepts left/right-aligned frames with frame sync pulse every 16 slots, allowing simultaneous routing of multiple audio sources like navigation, phone call, and media streams.
How does the SB-I efficiency architecture differ from standard Class D or Class AB?
SB-I is ST's proprietary Class-G derivative that modulates the output stage supply rails in real time based on instantaneous signal envelope-not fixed PWM duty cycle (Class D) nor linear conduction (Class AB). This reduces average power dissipation by up to 50% under music signals while maintaining <0.01% THD+N and eliminating EMI concerns associated with high-frequency switching.
Can the TDA7803A-8ZX be used in parallel mode, and what are the benefits?
Yes, the TDA7803A-8ZX supports parallel mode where two channels drive a single load (e.g., OUT1+OUT2 → one speaker), doubling output current capability. This yields up to 94 W into 4 Ω with improved thermal distribution across the Flexiwatt 27 package. Parallel mode is enabled via I²C register DB5 bit 7 and requires matched external output filtering.
TDA7803A-8ZX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 27-Flexiwatt, Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Audio ADC/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
TDA7803A-8ZX FAQ
1.How can I place an order for TDA7803A-8ZX through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7803A-8ZX 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 TDA7803A-8ZX reliable?
The price and inventory of TDA7803A-8ZX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7803A-8ZX is usually 5 days.
3.What payment methods are accepted for TDA7803A-8ZX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7803A-8ZX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7803A-8ZX?
TDA7803A-8ZX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7803A-8ZX 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 TDA7803A-8ZX?
For technical support, including TDA7803A-8ZX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7803A-8ZX requirements.
6.How does Aetrix verify that TDA7803A-8ZX is sourced from the original manufacturer or authorized distributors?
All TDA7803A-8ZX 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 TDA7803A-8ZX meets industry standards.
7.What is the process for return or replacement of TDA7803A-8ZX?
All TDA7803A-8ZX units undergo pre-shipment inspection (PSI). If there is an issue with TDA7803A-8ZX, 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 TDA7803A-8ZX part is unused and in its original packaging.
Return procedure for TDA7803A-8ZX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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