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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics FDA803D-EHX

Name: FDA803D-EHX
Brand: STMicroelectronics
SKU: FDA803D-EHX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FDA803D-EHX

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 36-PowerFSOP (0.295", 7.50mm Width)

Datasheet:: FDA803D-EHX.pdf

Description:: IC AMP D MONO 45W POWERSSO36

Quantity:: RFQ Add To RFQ list

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Inventory:4,660

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Product details

Overview

FDA803D-EHX from STMicroelectronics is a single-channel 45 W Class D digital-input automotive audio power amplifier, AEC-Q100 qualified for under-hood use, featuring integrated 108 dB D/A conversion, I²S/TDM digital input (up to 16-channel), and comprehensive diagnostics including short-to-rail, open-load-in-play, thermal warnings, and DC offset detection - deployed in car radio head units and e-call telematics modules.

For engineers reviewing the FDA803D-EHX datasheet, FDA803D-EHX pinout, FDA803D-EHX application, or FDA803D-EHX equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative options with documented functional differences - all grounded in ST's production datasheet DocID031487 Rev 2.

Technical Context

This device implements a closed-loop Class D architecture with integrated feedback low-pass filter, enabling high-fidelity audio performance without external LC filtering. It supports wide supply range (3.3–18 V) and operates across I²S and TDM modes at sampling rates up to 192 kHz, with configurable power limiting and mixed analog/digital mute control.

The diagnostic subsystem runs concurrent fault detection during playback: open-load detection on 2 Ω/4 Ω/8 Ω loads, four-tier thermal warning, clipping detection, and hot-spot monitoring via current-offset sensing. All diagnostics are accessible and configurable over I²C interface with 1.8 V/3.3 V bus compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	25 W @ 14.4 V, 4 Ω, 1 kHz, THD = 1% - sufficient for mid-range speaker drive in compact automotive head units.
Digital Input	I²S and TDM (4/8/16 channels) - enables direct connection to SoC audio processors without external serializer.
Sampling Rates	44.1 / 48 / 96 / 192 kHz - supports CD-quality to high-res audio streaming in infotainment systems.
Supply Range	3.3 V to 18 V - accommodates start-stop battery transients and low-voltage telematics operation.
D/A Resolution	108 dB SNR - achieves >16-bit effective dynamic range for clean audio reproduction.
Diagnostics	Real-time short-to-VCC/GND, open-load-in-play, DC offset, thermal warnings, and PWM skipping detection - reduces need for external monitoring circuitry.
Package	PowerSSO-36 exposed pad down - provides enhanced thermal dissipation for 45 W peak output in confined chassis space.

Pinout & Package

Package: PowerSSO-36 (exposed pad down), thermally optimized for automotive under-dash mounting with solderable thermal slug.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Main power supply input	Accepts 3.3–18 V; powers internal regulators and output stage - designed for direct battery connection with transient tolerance.
GND	Power and signal reference	Dedicated ground pins (GND1–GND6) minimize ground bounce in high-current switching operation.
OUT+	Class D output high-side	Drives speaker positive terminal; MOSFET-based output capable of 2 Ω load support.
OUT−	Class D output low-side	Completes H-bridge path; supports differential speaker connection and bridged-tied load (BTL) configuration.
SDA/SCL	I²C bidirectional interface	Supports 1.8 V and 3.3 V logic levels - enables direct interfacing with low-voltage microcontrollers.
CDIAG	Diagnostics status output	Open-drain flag indicating active fault condition - simplifies system-level error reporting without polling.
HWMUTE	Hardware mute control	Asynchronous analog mute activation - ensures zero-pop suppression during power sequencing or crash events.

Key Features

Feature	Design Value
Integrated feedback LPF	Eliminates need for external LC filter - reduces BOM count and PCB area in space-constrained head units.
Legacy mode ('no I²C')	Four factory-configurable settings - allows deployment in legacy designs without firmware update or I²C infrastructure.
Power limiting via I²C	Configurable RMS/peak limit thresholds - prevents speaker damage during high-SPL conditions or impedance mismatch.
Open-load detection in play	Validated on 2 Ω, 4 Ω, and 8 Ω loads during active audio playback - enables real-time speaker integrity monitoring without interrupting user experience.
CISPR 25 Class V compliance	Meets stringent automotive EMI requirements for radio band immunity - eliminates need for additional shielding or ferrite beads.

Applications

Car Radio Head Unit

e-Call Telematics Module

Use Scenario: Integrated audio amplification in OEM dashboard-mounted infotainment systems with digital audio source.

IC Role / Device Role / Timing Role: Single-channel Class D amplifier receiving I²S stream from application processor; handles full-range speaker drive with diagnostics.

Use Value: Delivers 25 W into 4 Ω with <1% THD while monitoring speaker continuity and thermal margin - reducing field failure rate in high-temperature cabin environments.

Use Scenario: Voice prompt and alert tone generation in emergency call (e-Call) control units.

IC Role / Device Role / Timing Role: Low-quiescent-power audio driver activated only during voice transmission; supports rapid wake-up from standby.

Use Value: Operates down to 3.3 V supply and draws ultra-low quiescent current - extends backup battery life during vehicle shutdown while maintaining speaker fault awareness.

Telematics Control Unit (TCU)

Automotive Rear Seat Entertainment

Use Scenario: Audio output for navigation prompts and connectivity alerts in cellular-connected TCUs.

IC Role / Device Role / Timing Role: Digital-input amplifier synchronized to system clock domain; interfaces via TDM for multi-channel routing flexibility.

Use Value: Supports 192 kHz sampling and 16-channel TDM - future-proofs integration with next-gen ADAS audio hubs requiring multi-source mixing.

Use Scenario: Compact rear-seat speaker driver in premium vehicle configurations with space-limited mounting zones.

IC Role / Device Role / Timing Role: High-efficiency Class D channel driving 2 Ω speakers; uses exposed-pad PowerSSO-36 for thermal management in plastic enclosures.

Use Value: Enables 30 W @ 10% THD into 2 Ω loads with integrated thermal protection - avoids derating in enclosed rear parcel shelves.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Class D automotive amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TAS6424LQDKRQ1	4-channel, higher channel count; no integrated D/A; requires external DAC; 40 V max supply.	Better suited for multi-zone audio systems; lacks FDA803D's single-channel optimization and diagnostic granularity.	Select when scaling to 4-speaker layouts and external DAC already present in design.
MAX9877EUP+T	Single-channel, analog-input only; no digital interface; lower power (15 W); no open-load-in-play detection.	Targeted at cost-sensitive entry-level radios; lacks FDA803D's digital-native architecture and real-time diagnostics.	Select only if I²S/TDM interface is unnecessary and diagnostic depth is not required.

Compared with TAS6424LQDKRQ1 and MAX9877EUP+T, FDA803D-EHX uniquely combines single-channel digital-input simplicity, 108 dB D/A integration, and playback-mode open-load detection - making it optimal for compact, high-reliability automotive audio nodes where channel count, diagnostics, and supply flexibility are prioritized over multi-channel density.

Availability

FDA803D-EHX is available at Aetrix Electronics and suitable for car radio head units, e-call telematics modules, and automotive rear seat entertainment systems requiring stable component supply, long-term automotive qualification, and traceable sourcing.

Supply support for FDA803D-EHX 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 ICs, power management, and microcontrollers - with over 30 years of AEC-Q100 product validation experience.

FDA803D belongs to ST's automotive audio amplifier product line, engineered specifically for digital-input, high-diagnostic-fidelity Class D amplification in safety-critical and thermally demanding vehicle environments.

FAQ

Does FDA803D-EHX support 2 Ω speaker loads?

Yes, FDA803D-EHX is explicitly rated for 2 Ω loads per datasheet Section 6.2 and Figure 6–7. It delivers 30 W at 10% THD into 2 Ω @ 14.4 V and includes dedicated thermal derating curves and current-offset-based hot-spot detection to ensure safe operation under sustained low-impedance conditions.

What diagnostic functions operate during active audio playback?

Open-load detection, DC offset detection, clipping detection, and PWM pulse skipping detection all function during playback ('in-play' mode), as confirmed in Sections 11.4–11.8 of DocID031487 Rev 2. These diagnostics use real-time signal analysis without interrupting audio output or requiring mute states.

Is an external LC filter required for FDA803D-EHX?

No. FDA803D-EHX integrates a feedback-based low-pass filter that eliminates the need for external LC components, as stated in the 'Features' section and validated in Application Diagram (Figure 3) and LC Filter Design (Section 6.1). This reduces board area and EMI tuning effort.

Can FDA803D-EHX operate without I²C communication?

Yes. FDA803D-EHX supports Legacy Mode ('no I²C'), with four factory-configurable settings for gain, mute behavior, and power limiting - detailed in Section 7.5 and Table 6. This enables plug-and-play deployment in systems lacking I²C infrastructure while retaining core amplification and protection features.

FDA803D-EHX Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerFSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Active

Type:: Class D

Output Type:: 1-Channel (Mono)

Max Output Power x Channels @ Load:: 45W x 1 @ 2Ohm

Voltage - Supply:: 3.3V ~ 18V

Features:: I2C, I2S, Mute, Short-Circuit and Thermal Protection, Standby

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Supplier Device Package:: PowerSSO-36 EPU

FDA803D-EHX FAQ

1.How can I place an order for FDA803D-EHX through Aetrix?

Please submit a Request for Quotation (RFQ) for FDA803D-EHX 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 FDA803D-EHX reliable?

The price and inventory of FDA803D-EHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FDA803D-EHX is usually 5 days.

3.What payment methods are accepted for FDA803D-EHX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FDA803D-EHX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FDA803D-EHX?

FDA803D-EHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FDA803D-EHX 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 FDA803D-EHX?

For technical support, including FDA803D-EHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FDA803D-EHX requirements.

6.How does Aetrix verify that FDA803D-EHX is sourced from the original manufacturer or authorized distributors?

All FDA803D-EHX 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 FDA803D-EHX meets industry standards.

7.What is the process for return or replacement of FDA803D-EHX?

All FDA803D-EHX units undergo pre-shipment inspection (PSI). If there is an issue with FDA803D-EHX, 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 FDA803D-EHX part is unused and in its original packaging.

Return procedure for FDA803D-EHX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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