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STMicroelectronics TDA7801SMTR
- Part No.:
- TDA7801SMTR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 27-Flexiwatt, Formed Leads
- Datasheet:
-
TDA7801SMTR.pdf
- Description:
- IC AMP D QUAD 72W 27FLEXIWATT
- Quantity:
- Payment:
- Shipping:
Inventory:4,477
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Product details
Overview
TDA7801SMTR from STMicroelectronics is a quad-channel 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 at 14.4 V (1 kHz, 10% THD) with MOSFET outputs, linear thermal protection, and independent short-circuit detection per channel.
For engineers reviewing the TDA7801SMTR datasheet, TDA7801SMTR pinout, TDA7801SMTR application, or TDA7801SMTR equivalent, key selection criteria include its Flexiwatt27 SMD package compatibility, 44.1–192 kHz selectable sampling rate, I²C-configurable gain and mute functions, and real-time speaker load diagnostics via open-drain CD/DIAG pin.
Technical Context
The TDA7801 implements a fully balanced transresistance output stage with BCD6 process integration, enabling on-chip 115 dB SNR and >105 dB dynamic range. Its architecture combines I²S data reception, programmable interpolation/scrambling, and four independent bridge-tied-load (BTL) power stages.
Diagnostics are implemented via dual-mode I²C interface: real-time register access for DC offset, clipping, thermal warnings, and fault prioritization (e.g., short-to-GND > open-load > thermal), plus legacy mode support without I²C bus dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 4×28 W @ 4 Ω, 14.4 V, 1 kHz, 10% THD - sufficient for full-range front/rear speakers in compact automotive head units |
| Max Output Power | 4×72 W @ 2 Ω - supports high-SPL subwoofer or low-impedance tweeter configurations |
| D/A Resolution | Integrated 110 dB D/A conversion - enables >105 dB dynamic range and 115 dB SNR without external DAC |
| Sampling Rate Support | 44.1 / 48 / 96 / 192 kHz - compatible with CD, DVD-Audio, SACD, and high-res streaming formats |
| I²C Diagnostics | Per-channel DC/AC load detection, clipping level select, and thermal warning - enables automated speaker health monitoring in head unit firmware |
| Supply Voltage Range | 8–18 V - matches automotive battery rail with cold-crank (6.5 V) and load-dump (27 V) tolerance via internal protection |
| THD+N | <0.02% @ 1 W, 4 Ω - ensures low-distortion line-out and preamp-grade signal integrity |
Pinout & Package
Package: Flexiwatt27 (SMD, slug-up). Thermal pad (Pin 1, TAB) must be soldered to PCB ground plane for thermal management and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TAB) | Thermal pad / GND | Primary heat path to PCB; electrically connected to power ground for noise isolation |
| 2 | Pll-filter / ENABLE | CMOS-compatible enable input (3.3/5 V); also accepts RC loop filter for PLL stability |
| 4, 6, 18, 20, 22, 24 | OUTx± (BTL pairs) | Four differential speaker outputs: LF±, LR±, RF±, RR± - each pair drives one channel in bridge mode |
| 5, 11, 12, 13 | I²S interface (WS, SCK, SD1_3, SD2_4) | Supports TDM mode for 8-channel audio over 4 data lines; 3.3/1.8 V logic compatible |
| 23, 27 | I²C Data / Clock | Open-drain I²C bus interface (3.3/5 V tolerant); enables configuration, diagnostics readback, and fault logging |
| 26 | CD/DIAG | Open-drain diagnostic output - asserts low on clipping, thermal warning, POR, or overcurrent; supports wired-OR fault aggregation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip D/A conversion | Eliminates need for external DAC and associated layout complexity, reducing BOM count and PCB area in space-constrained head units |
| Independent channel soft-mute | Front/rear mute control via I²C allows fade effects and channel-specific muting without MCU intervention |
| Selectable gain (4 levels) | Enables precise matching of amplifier sensitivity to source signal level (e.g., low-noise line-out vs. high-level speaker-level input) |
| Linear thermal protection | Four independent thermal warnings (one per channel) allow graceful power reduction before shutdown, preserving audio continuity |
| Four independent short-circuit protections | Prevents latch-up or damage during speaker wire short events - critical for field-repairable automotive modules |
Applications
| Automotive Head Unit | Aftermarket Infotainment System |
|---|---|
Use Scenario: Integrated 4-channel audio processing and amplification in OEM dashboard head units with digital source inputs. IC Role / Device Role / Timing Role: Quad BTL amplifier with embedded D/A, I²S receiver, and I²C diagnostics - serves as final-stage audio driver and speaker health monitor. Use Value: Reduces system latency by eliminating external DAC; enables real-time speaker diagnostics for warranty analytics and predictive maintenance. | Use Scenario: Compact aftermarket stereo with Bluetooth, USB, and digital radio support requiring high-fidelity multi-zone output. IC Role / Device Role / Timing Role: Digital-input power amplifier with configurable gain and mute - handles variable source signal levels and supports firmware-upgradable features. Use Value: Simplifies design with single-chip solution for 4-speaker setups; TDM mode allows future expansion to 8-channel via software update. |
| Car Audio DSP Amplifier Module | Compact Rear-Seat Entertainment System |
Use Scenario: DSP-controlled amplifier module with active crossover, EQ, and time alignment for premium sound systems. IC Role / Device Role / Timing Role: High-efficiency power stage with precise I²C register access - receives processed PCM data and drives speakers with minimal added distortion. Use Value: Maintains >105 dB dynamic range end-to-end; per-channel diagnostics feed DSP for adaptive protection and loudness compensation. | Use Scenario: Low-profile rear-seat media hub powering two independent speaker zones (left/right) with independent volume control. IC Role / Device Role / Timing Role: Dual-pair amplifier with independent enable/mute - allows zone-specific power gating and silent standby for energy efficiency. Use Value: Enables zero-power standby for unused zones; CMOS-compatible ENABLE pin simplifies MCU GPIO usage without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital-input audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7802TR | Same pinout, enhanced thermal performance (−40°C to +105°C ambient), improved THD+N (<0.015% @ 1 W) | Targeted for extended-temperature automotive modules requiring higher reliability under hood-mount conditions | Select when operating ambient exceeds 85°C or long-term field reliability is critical; otherwise TDA7801SMTR offers cost advantage |
| MAX9744ASA+T | 32-pin QFN, 4×25 W @ 4 Ω, I²S-only (no I²C diagnostics), no integrated D/A | Lacks on-chip DAC and speaker diagnostics; requires external DAC and microcontroller for fault handling | Choose only if board space is constrained and diagnostics are handled externally; not drop-in compatible due to package and feature gap |
Compared with TDA7802TR, TDA7801SMTR trades extended temperature rating and marginally lower THD for lower cost and proven field deployment; versus MAX9744ASA+T, it provides integrated diagnostics and DAC but requires larger Flexiwatt27 footprint and more complex I²C firmware integration.
Availability
TDA7801SMTR is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket head units, and compact DSP amplifier modules requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned manufacturing.
Supply support for TDA7801SMTR 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, industrial, and power management ICs, with broad analog and mixed-signal portfolio certified to AEC-Q100 standards.
The TDA7801 belongs to ST's car audio amplifier product line, designed specifically for digital-input, diagnostics-enabled infotainment systems where space, thermal efficiency, and speaker health monitoring are critical design constraints.
FAQ
What is the function of the CD/DIAG pin on TDA7801SMTR?
The CD/DIAG pin is an open-drain diagnostic output that signals clipping events, thermal warnings, power-on reset (POR), and overcurrent faults. It supports wired-OR connection of multiple devices and is readable via I²C register DB4 (address 0x14) for precise fault identification per channel.
Does TDA7801SMTR support TDM mode, and what are the requirements?
Yes - TDA7801SMTR supports 8-channel TDM mode exclusively in the PowerSO36 package. The Flexiwatt27 variants (including SMTR) do not support TDM; they operate in standard 4-channel I²S mode using SD1_3 and SD2_4 pins for left/right channel data multiplexing.
Can TDA7801SMTR operate without I²C bus connection?
Yes - it supports legacy mode where I²C pins (26 and 27) are repurposed as mute and enable controls. In this mode, gain is fixed, diagnostics are disabled, and configuration is limited to hardware strapping via address pins, making it suitable for cost-sensitive designs without microcontroller resources.
What thermal management is required for TDA7801SMTR in Flexiwatt27 SMD package?
The Flexiwatt27 SMD package requires soldering Pin 1 (TAB) to a minimum 400 mm² copper thermal pad connected to internal ground planes. Recommended PCB layout uses ≥4 thermal vias (0.3 mm diameter) under the TAB, and airflow ≥0.5 m/s is advised for continuous 4×28 W operation at 85°C ambient.
TDA7801SMTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 27-Flexiwatt, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
TDA7801SMTR FAQ
1.How can I place an order for TDA7801SMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7801SMTR 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 TDA7801SMTR reliable?
The price and inventory of TDA7801SMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7801SMTR is usually 5 days.
3.What payment methods are accepted for TDA7801SMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7801SMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7801SMTR?
TDA7801SMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7801SMTR 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 TDA7801SMTR?
For technical support, including TDA7801SMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7801SMTR requirements.
6.How does Aetrix verify that TDA7801SMTR is sourced from the original manufacturer or authorized distributors?
All TDA7801SMTR 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 TDA7801SMTR meets industry standards.
7.What is the process for return or replacement of TDA7801SMTR?
All TDA7801SMTR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7801SMTR, 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 TDA7801SMTR part is unused and in its original packaging.
Return procedure for TDA7801SMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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