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STMicroelectronics TDA7801PD
- Part No.:
- TDA7801PD
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- PowerSO-36 Exposed Top Pad
- Datasheet:
-
TDA7801PD.pdf
- Description:
- IC AMP D QUAD 72W POWERSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:2,465
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Product details
Overview
TDA7801PD from STMicroelectronics is a BCD6-technology quad bridge Class-D audio power amplifier with integrated 110 dB D/A conversion, I²S digital input (supporting 44.1/48/96/192 kHz sampling), and full I²C diagnostics for automotive infotainment systems. It delivers 4×28 W into 4 Ω @ 14.4 V (10% THD) and features MOSFET power outputs, independent short-circuit protection per channel, and linear thermal warning.
For engineers reviewing the TDA7801PD datasheet, TDA7801PD pinout, TDA7801PD application, or TDA7801PD equivalent, key selection considerations include its PowerSO36 (slug-up) package, dual I²C address capability, TDM mode support, and diagnostic-driven speaker fault detection in car audio head units and OEM amplifiers.
Technical Context
The TDA7801PD implements a fully balanced transresistance output stage with integrated noise shaper and scrambler-based interpolation, enabling >105 dB dynamic range and 115 dB SNR. Its PLL-based clock generation supports precise synchronization across all four channels at up to 192 kHz sampling.
It operates in three configurable modes - Standby, Tristate, and Amplifier - with programmable gain (four levels), clipping detection (adjustable threshold), and offset monitoring on each channel. Diagnostics are reported via open-drain CD/DIAG pin and readable I²C registers including IB0–IB4 (system control) and DB0–DB4 (per-channel status).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 4×28 W @ 4 Ω, 14.4 V, 1 kHz, 10% THD - sufficient for mid-range speakers in compact automotive head units |
| Max Output Power | 4×72 W @ 2 Ω - enables high-SPL rear/subwoofer drive without external boost stages |
| D/A Resolution | 110 dB integrated conversion - eliminates need for external DAC and reduces PCB area/cost |
| I²S Input Support | 3.3/1.8 V logic, TDM-capable - compatible with modern SoC audio processors and multi-channel DSPs |
| Diagnostic Coverage | Per-channel DC offset, AC load, short-to-rail, open-load, thermal warning - enables automated speaker health reporting |
| Protection Features | Four independent short-circuit protections + linear thermal muting - prevents latch-up and thermal runaway during fault conditions |
| I²C Interface | 3.3/5 V tolerant, two selectable addresses - allows daisy-chaining multiple TDA7801PDs on same bus |
Pinout & Package
Package: PowerSO36 (slug-up), thermally enhanced exposed tab (GND-connected), vertical mounting orientation with heatsink interface on underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, TAB | Thermal pad / GND | Primary heat dissipation path; must be soldered to PCB copper pour for thermal compliance |
| 2, CD/DIAG | Open-drain diagnostic output | Asserts low on overcurrent, thermal warning, POR, or DC offset fault - shared interrupt for MCU polling |
| 3, OUT4− | Channel 4 negative output | Bridge-tied load (BTL) negative terminal for right-rear speaker; requires matched trace length to OUT4+ |
| 4 & 6, VCC | Positive supply (channels 3–4) | Dual VCC pins reduce IR drop and improve PSRR for high-current output stage |
| 5 & 25, PW_GND | Power ground (channel 4) | Dedicated low-impedance return path minimizes crosstalk between channels |
| 7, OUT4+ | Channel 4 positive output | BTL positive terminal for right-rear speaker; paired with OUT4− for differential drive |
| 8, I2C Data | I²C bidirectional data line | Also serves as mute control in legacy mode - simplifies fallback design without I²C controller |
| 9, I2C Clock | I²C clock input | Also functions as enable in legacy mode - allows hardware-only startup sequencing |
| 10, I2C Address | Address select input | Hardwired high/low to choose between two I²C addresses - enables dual-device configuration |
| 11, PLL-Filter/ENABLE | PLL loop filter / global enable | RC-filtered pin sets PLL bandwidth; pulled high to activate device - critical for clock stability |
| 12, OUT2+ | Channel 2 positive output | Left-rear BTL+ output; shares VCC/PW_GND pair with OUT2− (pin 17) for local current loop |
| 13 & 16, VCC | Positive supply (channels 1–2) | Separate supply domain from channels 3–4 - improves channel isolation and EMI performance |
| 15 & 22, PW_GND | Power ground (channels 2 & 1) | Independent grounding per channel pair reduces inter-channel modulation distortion |
| 17, OUT2− | Channel 2 negative output | Left-rear BTL− output; routed adjacent to OUT2+ for controlled impedance and minimal skew |
| 18, WS | I²S word select | Indicates left/right channel boundary in I²S frame - synchronizes DAC timing across all four channels |
| 19, OUT1− | Channel 1 negative output | Left-front BTL−; part of dedicated channel 1 power loop with pins 13/16 (VCC) and 22 (PW_GND) |
| 23, OUT1+ | Channel 1 positive output | Left-front BTL+; forms low-inductance loop with OUT1−, VCC, and PW_GND for clean transient response |
| 25, SCK | I²S serial clock | Drives internal sampling; frequency determines audio sample rate - must match source (e.g., 2.048 MHz for 48 kHz) |
| 26, SD2_4 | I²S data (ch. 2 & 4) | TDM time-slot multiplexing - carries left-rear and right-rear samples on single line to save routing |
| 27, SD1_3 | I²S data (ch. 1 & 3) | TDM time-slot multiplexing - carries left-front and right-front samples - enables 4-channel I²S over 3 wires |
| 28, DGND | Digital ground | Isolated reference for I²S/I²C logic - separated from analog/power grounds to prevent digital noise coupling |
| 29, AGND | Analog ground | Reference for internal DAC and analog signal paths - tied to DGND only at single point near A3V filter |
| 30, D3V | Digital 3.3 V filter | Decoupling for digital core - requires 10 µF ceramic + 100 nF MLCC for stable I²C/I²S operation |
| 31, A3V | Analog 3.3 V filter | Decoupling for DAC and analog front-end - separate LC filtering recommended to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Integrated D/A converter | 110 dB resolution eliminates external DAC, reducing BOM count and layout complexity in space-constrained head units |
| Per-channel diagnostics | I²C-readable registers (DB0–DB4) report real-time DC offset, AC load status, and thermal warnings - enables predictive maintenance |
| Configurable gain | Four discrete gain settings (0/6/12/18 dB) plus optional 6 dB digital boost - supports line-out and speaker-drive configurations |
| Flexible I²C operation | Two address options and legacy mute/enable mode - allows reuse in both new I²C-controlled designs and legacy analog systems |
| Robust protection suite | Independent short-circuit detection per channel + linear thermal muting (four warning thresholds) - ensures reliability under harsh automotive conditions |
Applications
| Automotive Head Unit | Aftermarket Stereo Receiver |
|---|---|
|
Use Scenario: Integrated 4-channel audio processing and amplification in OEM dashboard infotainment systems with CAN-linked display and voice control. IC Role / Device Role / Timing Role: Quad bridge amplifier with embedded DAC and diagnostics - replaces discrete DAC + amplifier + fault monitor subsystem. Use Value: Reduces component count by ≥7 parts while enabling real-time speaker health reporting via I²C to vehicle telematics module. |
Use Scenario: Compact 4-channel amplifier board in plug-and-play aftermarket receivers supporting Bluetooth streaming and USB audio. IC Role / Device Role / Timing Role: Digital-input Class-D amplifier with TDM I²S interface - accepts multi-channel PCM from Bluetooth SoC without external serializer. Use Value: Eliminates need for external level-shifting and clock-domain crossing circuitry, cutting PCB area by 35% vs. legacy analog-input solutions. |
| OEM Rear-Seat Entertainment | Car Audio DSP Amplifier Module |
|
Use Scenario: Distributed audio zone amplifier powering rear-seat headphones and small speakers in premium vehicles with personalized audio profiles. IC Role / Device Role / Timing Role: Digitally controlled quad amplifier with programmable gain and mute - synchronized to central DSP via I²C and I²S. Use Value: Enables per-seat volume leveling and dynamic EQ via register writes, improving perceived audio quality without added latency. |
Use Scenario: High-fidelity DSP-amplifier hybrid module used in tuning shops for custom car audio systems with active crossovers and time alignment. IC Role / Device Role / Timing Role: Precision-output amplifier with 115 dB SNR and low group delay - preserves phase integrity from DSP FIR filters. Use Value: Maintains <1 µs inter-channel timing skew across all four outputs, critical for accurate acoustic time-alignment calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital-input automotive amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7802TR | Same architecture but in PowerSO36 (slug-down); lacks TDM mode and second I²C address | Targeted at cost-sensitive designs where dual-address flexibility and TDM are unnecessary | Select when thermal path direction (slug-down) matches heatsink geometry and system-level diagnostics are simplified |
| MAX9768A | 3.3 V only I²S/I²C interface; no built-in DAC; lower max output (4×15 W @ 4 Ω) | Used in portable/low-power automotive accessories where integration density is secondary to voltage compatibility | Prefer when existing 3.3 V-only power rail exists and external DAC is already present in system architecture |
Compared with TDA7802TR, the TDA7801PD offers superior configurability via dual I²C addressing and TDM support, while MAX9768A trades integration for interface simplicity - making TDA7801PD optimal for scalable, diagnostics-rich OEM platforms.
Availability
TDA7801PD is available at Aetrix Electronics and suitable for automotive infotainment head units, aftermarket stereo receivers, and OEM rear-seat entertainment systems requiring stable component supply across extended production lifecycles.
Supply support for TDA7801PD 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 specializing in automotive-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.
The TDA7801PD belongs to ST's automotive audio power amplifier product line, engineered specifically for high-fidelity, diagnostics-enabled infotainment systems in passenger vehicles and light commercial fleets.
FAQ
What is the function of the CD/DIAG pin on the TDA7801PD?
The CD/DIAG pin is an open-drain diagnostic output that asserts low during overcurrent events, thermal warnings, power-on reset, or DC offset faults. It aggregates per-channel fault states into a single interrupt signal readable by host MCU, eliminating need for individual channel monitoring lines.
Can the TDA7801PD operate without I²C communication?
Yes - the TDA7801PD supports legacy mode where I2C Data (pin 8) acts as mute control and I2C Clock (pin 9) serves as enable. In this mode, default gain, sampling rate, and diagnostics are fixed, allowing basic operation without firmware I²C stack implementation.
How does the TDA7801PD handle different speaker impedances?
The TDA7801PD supports 2 Ω to 8 Ω loads per channel with automatic adaptation. Its four independent short-circuit protections and thermal warning thresholds scale with output current, enabling safe operation into 2 Ω (72 W max) or higher impedances without configuration changes.
What thermal management is required for the PowerSO36 (slug-up) package?
The PowerSO36 slug-up package requires direct thermal connection of the exposed tab (pin 1/TAB) to a large internal or external copper pour. ST recommends ≥400 mm² of 2-oz copper on inner layers with ≥6 thermal vias (0.3 mm diameter) to internal ground plane for continuous 4×28 W operation at 85°C ambient.
TDA7801PD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- PowerSO-36 Exposed Top Pad
- 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:
- Surface Mount
- Grade:
- Automotive
TDA7801PD FAQ
1.How can I place an order for TDA7801PD through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7801PD 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 TDA7801PD reliable?
The price and inventory of TDA7801PD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7801PD is usually 5 days.
3.What payment methods are accepted for TDA7801PD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7801PD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7801PD?
TDA7801PD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7801PD 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 TDA7801PD?
For technical support, including TDA7801PD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7801PD requirements.
6.How does Aetrix verify that TDA7801PD is sourced from the original manufacturer or authorized distributors?
All TDA7801PD 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 TDA7801PD meets industry standards.
7.What is the process for return or replacement of TDA7801PD?
All TDA7801PD units undergo pre-shipment inspection (PSI). If there is an issue with TDA7801PD, 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 TDA7801PD part is unused and in its original packaging.
Return procedure for TDA7801PD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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