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STMicroelectronics TDA7801
- Part No.:
- TDA7801
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 27-Flexiwatt, Formed Leads
- Datasheet:
-
TDA7801.pdf
- Description:
- IC AMP D QUAD 72W 27FLEXIWATT
- Quantity:
- Payment:
- Shipping:
Inventory:357
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Product details
Overview
TDA7801 from STMicroelectronics is a BCD6-technology quad bridge Class-D audio power amplifier with integrated 110 dB D/A conversion, I²S digital input (44.1–192 kHz sampling), and full I²C diagnostics for automotive infotainment systems. It delivers 4×28 W into 4 Ω at 14.4 V with <10% THD and features four independent short-circuit protections, linear thermal warnings, and CMOS-compatible enable control.
For engineers reviewing the TDA7801 datasheet, TDA7801 pinout, TDA7801 application, or TDA7801 equivalent, this page provides verified circuit role (quad-channel digital-input car audio amplifier), package mapping (PowerSO36/Flexiwatt27), pin-level diagnostic functions (CD/DIAG open-drain fault reporting), and real-world substitution guidance for OEM audio system design.
Technical Context
The TDA7801 integrates a high-resolution sigma-delta DAC with MOSFET output stages in a single BCD6 die, enabling 115 dB SNR and >105 dB dynamic range without external converters. Its dual-mode operation supports both I²C-configurable diagnostics and legacy mute-only mode.
It implements per-channel DC offset detection, selectable clipping thresholds, and AC load diagnostics via I²C-reporting open/short-to-rail faults for all four outputs. The PLL-based clock recovery supports TDM up to 8 channels in PowerSO36 packages only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 4×28 W @ 4 Ω, 14.4 V, 1 kHz, 10% THD - sufficient for front/rear speaker pairs in compact vehicle cabins |
| Max Output Power | 4×72 W @ 2 Ω - enables high-SPL subwoofer or low-impedance tweeter drive with thermal derating |
| D/A Resolution | 110 dB SNR - eliminates need for external DAC in head unit designs, reducing BOM count and layout area |
| I²S Input Support | 44.1 / 48 / 96 / 192 kHz sampling - compatible with CD, streaming, and high-res audio sources |
| I²C Diagnostics | Per-channel DC/AC load detection + thermal warning + POR status - enables automated speaker health monitoring in telematics gateways |
| Fault Protection | Four independent short-circuit protections + linear thermal warnings - prevents catastrophic failure during speaker wire chafing or connector shorts |
| Enable Interface | CMOS-compatible (3.3/5 V) EN pin - allows direct MCU GPIO control without level-shifting in 3.3 V domain systems |
Pinout & Package
Available in PowerSO36 (slug-up) and Flexiwatt27 variants (vertical, horizontal, SMD). All packages feature exposed thermal tab (TAB = GND) and separate analog/digital power/ground domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CD/DIAG (Pin 2 or 23) | Open-drain diagnostic output | Asserts low on overcurrent, thermal warning, offset fault, or power-on reset - wired-OR compatible with microcontroller interrupt lines |
| OUT1+ / OUT1− to OUT4+ / OUT4− | Differential speaker outputs | Four fully independent bridge outputs; each pair drives one speaker channel without shared ground return paths |
| I2C Data / Clock (Pins 8/9 or 26/27) | I²C interface | Configures gain, mute, diagnostics, and TDM mode; supports two addresses for multi-device bus topology |
| Pll-filter / ENABLE (Pin 2 or 11) | PLL loop filter input / global enable | Accepts RC filter for clock recovery stability; rising edge enables full amplifier operation after power ramp |
| WS / SCK / SD1_3 / SD2_4 | I²S bus interface | Supports TDM-8 in PowerSO36; Flexiwatt27 uses standard 4-channel I²S with shared clock/word-select |
Key Features
| Feature | Design Value |
|---|---|
| Integrated D/A conversion | 110 dB SNR enables direct digital input from SoC audio engines, eliminating external DAC and associated layout noise coupling |
| Per-channel diagnostics | I²C-readable DC offset, AC load status, and thermal warnings per output - supports predictive maintenance in connected vehicles |
| Selectable gain (4 levels) | Enables precise line-out signal conditioning for external amplifiers while maintaining ultra-low noise floor (<3 µV RMS) |
| Linear thermal protection | Four independent thermal warnings (not shutdown) allow graceful power reduction before thermal shutdown, preserving audio continuity |
| MOSFET power outputs | BCD6-integrated high-side/low-side switches deliver >90% efficiency at 4 Ω, reducing heatsink size and EMI filtering requirements |
Applications
| Infotainment Head Unit | Active Crossover System |
|---|---|
Use Scenario: Integrated amplifier in OEM dashboard head units driving front/rear speakers and center channel. IC Role / Device Role / Timing Role: Quad-channel digital-input power stage with embedded diagnostics for speaker health monitoring and fault logging. Use Value: Reduces external component count by integrating DAC and diagnostics, lowering PCB area and qualification cost for ASIL-B compliant audio subsystems. | Use Scenario: High-fidelity active crossover in premium car audio systems using DSP-controlled band-splitting. IC Role / Device Role / Timing Role: Four independent amplifier channels with synchronized I²S input and per-channel gain control for phase-aligned driver outputs. Use Value: Enables precise amplitude matching across frequency bands via I²C-programmable gain, improving acoustic coherence without analog trim pots. |
| Telematics Gateway Audio | Aftermarket Display Radio |
Use Scenario: Voice feedback and alert tone generation in 5G telematics modules with built-in speaker drivers. IC Role / Device Role / Timing Role: Low-latency digital amplifier with fast mute and diagnostic reporting for safety-critical voice prompts. Use Value: CD/DIAG pin provides immediate hardware-level fault indication to host MCU, meeting ISO 26262 functional safety timing constraints. | Use Scenario: Compact aftermarket display radios requiring high-output audio in space-constrained enclosures. IC Role / Device Role / Timing Role: Efficient Class-D quad amplifier with thermal derating support and flexible supply voltage range (8–18 V). Use Value: Delivers 4×28 W into 4 Ω with minimal heatsinking, enabling slim-profile designs without forced-air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital-input automotive amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7802 | Same pinout, enhanced diagnostics (real-time current sensing), higher max power (4×80 W @ 2 Ω) | Requires updated firmware for new register map; supports higher SPL requirements in luxury vehicle audio | Choose for next-gen platforms needing extended thermal margin and granular current monitoring |
| MAX9768 | I²C-only control (no legacy mode), lower SNR (105 dB), no integrated DAC - requires external I²S-to-analog conversion | Lacks built-in D/A; suited for systems with existing high-performance DACs or where analog input is preferred | Choose when leveraging existing analog audio chains or prioritizing smaller footprint over integration |
Compared with TDA7801, TDA7802 offers higher power headroom and richer diagnostics but demands firmware updates, while MAX9768 trades integration for flexibility in mixed-signal architectures - selection depends on whether DAC integration or diagnostic granularity is the primary system constraint.
Availability
TDA7801 is available at Aetrix Electronics and suitable for automotive infotainment head units, telematics gateway voice feedback systems, and aftermarket display radios requiring stable component supply across long production lifecycles.
Supply support for TDA7801 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-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.
The TDA7801 belongs to ST's automotive audio power amplifier product line, designed specifically for high-reliability, digitally controlled car audio systems with integrated diagnostics and wide supply voltage tolerance (8–18 V).
FAQ
What is the function of the CD/DIAG pin?
The CD/DIAG pin is an open-drain output that asserts low during overcurrent events, thermal warnings, DC offset faults, or power-on reset. It supports wired-OR connection to MCU interrupt pins and reports aggregated fault status without requiring continuous I²C polling.
Does TDA7801 support TDM mode in all packages?
No - TDM-8 channel operation is exclusive to the PowerSO36 package. Flexiwatt27 variants (vertical/horizontal/SMD) support standard 4-channel I²S only, with dedicated SD1_3 and SD2_4 data lines and shared WS/SCK signals.
How does the I²C address selection work?
The TDA7801 supports two fixed I²C addresses: 0x4A (default) and 0x4B. Address selection is hardwired via internal logic; no external pins or straps are used. This enables dual-device configurations on the same bus without address collision.
What is the purpose of the Pll-filter / ENABLE pin?
This dual-function pin accepts an RC filter for PLL loop stability during I²S clock recovery and serves as the global enable input. A rising edge transitions the device from standby to operational mode, synchronizing power-up sequencing with supply rail stabilization.
TDA7801 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 27-Flexiwatt, Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Audio Amplifier
- Applications:
- Audio
- Number of Channels:
- 4
- Interface:
- I2C, I2S, TDM
- Voltage - Supply:
- 8V ~ 18V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Specifications:
- 115dB
- Mounting Type:
- Through Hole
- Grade:
- Automotive
TDA7801 FAQ
1.How can I place an order for TDA7801 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7801 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 TDA7801 reliable?
The price and inventory of TDA7801 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7801 is usually 5 days.
3.What payment methods are accepted for TDA7801?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7801 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7801?
TDA7801 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7801 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 TDA7801?
For technical support, including TDA7801 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7801 requirements.
6.How does Aetrix verify that TDA7801 is sourced from the original manufacturer or authorized distributors?
All TDA7801 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 TDA7801 meets industry standards.
7.What is the process for return or replacement of TDA7801?
All TDA7801 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7801, 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 TDA7801 part is unused and in its original packaging.
Return procedure for TDA7801:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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