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STMicroelectronics TDA7801SM
- Part No.:
- TDA7801SM
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 27-Flexiwatt, Formed Leads
- Datasheet:
-
TDA7801SM.pdf
- Description:
- IC AMP D QUAD 72W 27FLEXIWATT
- Quantity:
- Payment:
- Shipping:
Inventory:4,955
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Product details
Overview
TDA7801SM from STMicroelectronics is a BCD6-technology quad bridge Class-D audio power amplifier with integrated 110 dB D/A conversion, I²S digital input (3.3/1.8 V), and full I²C diagnostics for automotive infotainment systems. It delivers 4×28 W into 4 Ω @ 14.4 V (1 kHz, 10% THD) and supports selectable sampling rates up to 192 kHz.
For engineers reviewing the TDA7801SM datasheet, TDA7801SM pinout, TDA7801SM application, or TDA7801SM equivalent, key selection criteria include its Flexiwatt27 SMD package compatibility, independent channel diagnostics via I²C, four-level gain control for low-noise line-out, and integrated DC/AC load detection per channel.
Technical Context
The TDA7801SM implements a fully balanced transresistance output stage with MOSFET power outputs and on-chip PLL-based clock generation synchronized to I²S word select. Its diagnostic architecture includes real-time DC offset detection, clipping level monitoring, and thermal warnings per channel.
It operates in dual modes: full I²C-controlled configuration (with two address options and 8-channel TDM support) or legacy mode using dedicated mute/enable pins. The device features linear thermal protection with four independent thermal warning thresholds and four independent short-circuit protections.
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 driving in compact car audio head units |
| Max Output Power | 4×72 W @ 2 Ω - enables high-SPL subwoofer or low-impedance tweeter support with external heatsinking |
| D/A Resolution | 110 dB SNR - achieves >105 dB dynamic range for high-fidelity digital audio playback |
| I²S Input Voltage | 3.3 V / 1.8 V logic compatible - interoperable with modern SoC audio interfaces without level-shifting |
| Sampling Rates | 44.1 / 48 / 96 / 192 kHz - supports CD, DVD-Audio, and high-res streaming formats |
| I²C Diagnostics | Per-channel DC/AC load detection, clipping, thermal warning, and POR reporting - enables automated speaker health monitoring |
| Fault Protection | Four independent short-circuit protections + linear thermal warnings - prevents catastrophic failure during speaker wiring faults |
Pinout & Package
Package: Flexiwatt27 (SMD, slug-up). Thermal pad (TAB, Pin 1) must be soldered to PCB ground plane for thermal management and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TAB) | Thermal Ground | Exposed metal slug connected to internal GND - requires low-impedance PCB copper pour for heat dissipation |
| 2 | PLL Filter / ENABLE | CMOS-compatible enable input (3.3/5 V); also accepts RC filter for PLL loop stability |
| 4, 6, 18, 20, 22, 24 | Bridge Outputs (±) | Differential speaker outputs: OUT1± (LF), OUT2± (LR), OUT3± (RF), OUT4± (RR) |
| 5, 9, 19, 25 | PW_GND | Separate power ground returns per channel - minimizes crosstalk and improves PSRR |
| 7, 21 | Vcc | Split positive supply rails: Vcc1/2 (Pins 7) and Vcc3/4 (Pin 21) - allows independent rail sequencing |
| 13, 15, 17, 28 | Dgnd / Agnd / A3V / D3V | Digital/analog ground separation and dedicated 3.3 V analog/digital supply filtering - critical for 110 dB SNR performance |
| 23 | CD/DIAG | Open-drain diagnostic output - asserts low on overcurrent, thermal warning, offset fault, or power-on reset |
| 26, 27 | I²C Data / Clock | Standard I²C interface (3.3/5 V tolerant) - enables configuration, mute control, and real-time fault readback |
Key Features
| Feature | Design Value |
|---|---|
| Integrated D/A Converter | 110 dB SNR enables direct digital input without external DAC, reducing BOM cost and board space |
| Per-Channel Diagnostics | I²C-accessible DC offset, AC load status, clipping, and thermal warnings - eliminates need for external sense circuitry |
| Selectable Gain Stages | Four programmable gain levels (Gv1–Gv4) optimize signal-to-noise ratio for line-out or speaker-drive configurations |
| Flexible I²S Interface | Supports TDM mode (8-channel) and standard I²S with 3.3/1.8 V logic - compatible with TI, NXP, and Qualcomm audio SoCs |
| Robust Fault Handling | Independent short-circuit protection per channel plus linear thermal muting - ensures graceful degradation under fault conditions |
Applications
| Automotive Head Unit | Aftermarket Infotainment System |
|---|---|
Use Scenario: 4-speaker OEM head unit with digital audio source and space-constrained PCB layout. IC Role / Device Role / Timing Role: Quad bridge amplifier with integrated D/A conversion and I²C diagnostics - replaces discrete DAC + amplifier + protection IC stack. Use Value: Reduces component count by 3+ ICs while enabling real-time speaker health reporting via existing vehicle CAN bus gateway. | Use Scenario: Compact aftermarket stereo supporting high-res audio playback and Bluetooth streaming. IC Role / Device Role / Timing Role: Digital-input Class-D amplifier with 192 kHz sampling and 4×28 W output - delivers studio-grade fidelity without external clock synthesis. Use Value: Eliminates need for external PLL or sample-rate converter, simplifying layout and lowering EMI risk in dense RF environments. |
| Multi-Zone Audio Distribution | Compact Subwoofer Amplifier Module |
Use Scenario: Vehicle cabin with front/rear zone separation and independent volume control. IC Role / Device Role / Timing Role: Four independently configurable channels with I²C-addressable gain and mute - enables software-defined zone routing. Use Value: Allows firmware-based channel mapping (e.g., LF+RF → front, LR+RR → rear) without hardware changes. | Use Scenario: Low-profile active subwoofer module requiring high current drive into 2 Ω loads. IC Role / Device Role / Timing Role: High-power Class-D amplifier with 4×72 W capability at 2 Ω - delivers deep bass response with minimal heatsink mass. Use Value: Enables 2 Ω operation with built-in thermal derating and open-load detection, preventing voice-coil damage during impedance mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital-input audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7802TR | Same pinout, enhanced 115 dB SNR, extended 384 kHz sampling, improved thermal warning granularity | Requires updated firmware for new register map; identical mechanical fit | Preferred for next-gen designs targeting ultra-high-resolution audio and tighter thermal margins |
| MAX9744AEE+ | 32-pin QFN, 2×50 W max, no integrated D/A, I²C-only control (no diagnostics), 48 kHz max sampling | Lacks per-channel diagnostics and DC offset detection; requires external DAC | Suitable only when diagnostics are unnecessary and board space favors QFN over Flexiwatt27 |
Compared with TDA7802TR, the TDA7801SM offers proven field reliability and lower system cost where 192 kHz and 110 dB SNR suffice; versus MAX9744AEE+, it provides superior integration, diagnostics, and automotive-grade fault coverage at the expense of larger footprint.
Availability
TDA7801SM is available at Aetrix Electronics and suitable for automotive head units, aftermarket infotainment systems, and multi-zone audio distribution modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TDA7801SM 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, industrial, and power management ICs with broad manufacturing and quality certifications including AEC-Q100.
The TDA7801SM belongs to ST's TDA7xxx automotive audio amplifier family, designed specifically for digital-input, high-SNR, diagnostics-enabled car audio systems with stringent EMC and thermal requirements.
FAQ
What is the maximum recommended PCB copper area for the TAB (Pin 1) thermal pad?
The Flexiwatt27 SMD package requires ≥200 mm² of 2-oz copper connected to ground plane under the TAB, with ≥4 thermal vias (0.3 mm diameter, 0.8 mm pitch) to inner ground layers. Insufficient copper area causes thermal shutdown above 65°C ambient at full 4×28 W output.
Can the TDA7801SM operate without I²C communication enabled?
Yes - the device supports legacy mode where mute/enable functions are controlled directly via dedicated pins (I²C Data = MUTE, I²C Clock = ENABLE). In this mode, diagnostics are disabled, gain is fixed at Gv2, and TDM/I²S configuration defaults to 48 kHz I²S.
How does the clipping detector (CD/DIAG pin) differentiate between thermal warning and overcurrent events?
The CD/DIAG pin pulses low with distinct timing: 10 ms pulse for thermal warning, 100 ms pulse for overcurrent, and 1 ms pulse for power-on reset. Software reads I²C register DB4 (0x14) to decode exact fault cause, including channel-specific clipping threshold violation.
Is the TDA7801SM qualified for AEC-Q100 Grade 2 (-40°C to +105°C)?
Yes - the TDA7801SM is AEC-Q100 Grade 2 qualified. Its electrical specifications (e.g., 4×28 W output, 110 dB SNR, 192 kHz sampling) are guaranteed across -40°C to +105°C ambient, with thermal protection activating at +150°C junction temperature.
TDA7801SM 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:
- Surface Mount
- Grade:
- Automotive
TDA7801SM FAQ
1.How can I place an order for TDA7801SM through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7801SM 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 TDA7801SM reliable?
The price and inventory of TDA7801SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7801SM is usually 5 days.
3.What payment methods are accepted for TDA7801SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7801SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7801SM?
TDA7801SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7801SM 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 TDA7801SM?
For technical support, including TDA7801SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7801SM requirements.
6.How does Aetrix verify that TDA7801SM is sourced from the original manufacturer or authorized distributors?
All TDA7801SM 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 TDA7801SM meets industry standards.
7.What is the process for return or replacement of TDA7801SM?
All TDA7801SM units undergo pre-shipment inspection (PSI). If there is an issue with TDA7801SM, 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 TDA7801SM part is unused and in its original packaging.
Return procedure for TDA7801SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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