Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics FDA903D-EHT

Name: FDA903D-EHT
Brand: STMicroelectronics
SKU: FDA903D-EHT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: FDA903D-EHT

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

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

Datasheet:: FDA903D-EHT.pdf

Description:: IC AMP D MONO 45W POWERSSO36

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:994

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

FDA903D-EHT from STMicroelectronics is a single-channel 45 W Class D digital-input automotive audio power amplifier, AEC-Q100 qualified for under-hood operation. It integrates 108 dB D/A conversion, I²S/TDM digital input (up to 16-channel), and real-time I_LOAD current monitoring. Designed for car radio, telematics, and e-call systems, it delivers 30 W into 4 Ω at 14.4 V with THD = 10% and supports 2 Ω loads.

For engineers reviewing the FDA903D-EHT datasheet, FDA903D-EHT pinout, FDA903D-EHT application, or FDA903D-EHT equivalent, key selection considerations include its wide 3.3–18 V supply range, CISPR 25 Class V EMC compliance, integrated thermal/short-circuit diagnostics, and configurable power limiting via I²C - all critical for robust automotive infotainment and safety-critical audio subsystems.

Technical Context

The FDA903D-EHT implements a closed-loop Class D architecture with output lowpass filter embedded in the feedback path, enabling high-fidelity audio performance and precise PWM control. Its digital input accepts I²S or TDM formats at sampling rates up to 192 kHz, with native support for 4/8/16-channel TDM streams.

Internal diagnostics include short-to-VCC/GND detection, open-load detection during playback, DC offset monitoring (active in play/mute), four-level thermal warning, and clipping detection - all reported via I²C. The device operates in legacy mode without I²C control, offering four preset configurations for simplified deployment.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	30 W @ 4 Ω, 14.4 V, 1 kHz, THD = 10% - enables high-SPL audio in compact head unit designs
Digital Input	I²S or TDM (4/8/16 CH) - supports multi-zone audio routing and advanced signal processing
Sampling Rates	44.1 / 48 / 96 / 192 kHz - compatible with CD, streaming, and high-res audio sources
Supply Range	3.3 V to 18 V - accommodates start-stop battery transients and 12 V/24 V vehicle architectures
D/A Resolution	108 dB SNR - ensures wide dynamic range and low noise floor for premium audio quality
EMC Compliance	CISPR 25 Class V - meets stringent automotive radiated emission requirements without external shielding
Quiescent Current	< 10 mA @ 14.4 V - minimizes standby power draw in always-on telematics modules
Load Capability	Drives 2 Ω loads - supports high-current subwoofer channels and low-impedance speaker configurations

Pinout & Package

Package: PowerSSO-36 exposed pad (slug-down), RoHS-compliant, thermally optimized for automotive PCB mounting with bottom-side thermal pad soldered to copper pour.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Main power supply input	Accepts 3.3–18 V; internal LDOs derive bias rails for analog/digital blocks
GND	Power ground	Common reference for power stage and logic; tied to exposed thermal pad
OUT+	Class D output high-side	Drives speaker positive terminal; MOSFET half-bridge output with integrated gate drivers
OUT−	Class D output low-side	Completes speaker drive path; supports differential or single-ended load configurations
I²S_SDIN	Digital audio data input	Latches left/right channel data on I²S_WS edge; supports TDM slot alignment
I²C_SDA / SCL	Configuration & diagnostics bus	3.3 V / 1.8 V tolerant; enables real-time fault reporting and power limiter setup
ILIM	Analog current sense input	Monitors load current via external shunt; feeds internal ADC for I_LOAD readback
HWMUTE	Hardware mute control	Active-low pin forcing immediate analog mute; independent of I²C state or firmware

Key Features

Feature	Design Value
Integrated I_LOAD current monitoring	Real-time analog current sensing with I²C-readback resolution - enables speaker protection and usage analytics
Open-load detection in play mode	Validates speaker continuity while audio is active - eliminates silent failure modes in safety-critical e-call alerts
Configurable power limiting	I²C-adjustable output ceiling prevents thermal runaway during sustained bass peaks or low-Z loads
Four-level thermal warning	Graduated overtemperature alerts (T_WARN1–T_WARN4) allow adaptive system response before shutdown
Legacy 'no-I²C' mode	Four factory-configurable presets (gain, mute, limiter) - simplifies integration in cost-sensitive or legacy MCU designs

Applications

Car Radio Audio Amplifier

Telematics Voice Prompt System

Use Scenario: Integrated amplifier in OEM head unit delivering main cabin audio.

IC Role / Device Role / Timing Role: Single-channel Class D output stage with digital input interface and thermal management.

Use Value: 30 W into 4 Ω enables loud, distortion-free playback across temperature extremes (-40°C to +105°C ambient).

Use Scenario: Audio output for voice-guided navigation and emergency call (e-call) prompts.

IC Role / Device Role / Timing Role: Reliable, low-latency audio driver with diagnostic readiness for safety-critical alerts.

Use Value: Open-load-in-play detection ensures speaker integrity verification during live e-call transmission.

Automotive Rear-Seat Entertainment

Connected Vehicle Infotainment Gateway

Use Scenario: Compact amplifier module driving rear-seat speakers in multi-zone systems.

IC Role / Device Role / Timing Role: TDM-capable digital input receiver supporting time-synchronized multi-channel audio distribution.

Use Value: 16-channel TDM support allows daisy-chained amplifiers sharing one I²S bus, reducing MCU pin count and PCB routing complexity.

Use Scenario: Central audio hub aggregating signals from ADAS, cloud services, and local media.

IC Role / Device Role / Timing Role: High-SNR D/A converter with integrated diagnostics for system-level health monitoring.

Use Value: 108 dB SNR and CISPR 25 Class V compliance ensure clean audio output without interfering with RF-sensitive modules (e.g., LTE, GNSS).

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
TAS5414CQPHPRQ1	4-channel, 12 W/channel @ 4 Ω; lower max output power; no integrated current monitoring	Better suited for multi-speaker mid-range systems requiring channel count over single-channel power density	Select when multi-channel integration outweighs need for real-time I_LOAD telemetry
MAX9744AEE+T	Single-channel, 20 W @ 4 Ω; 12 V only; no AEC-Q100 qualification or automotive diagnostics	Limited to non-automotive industrial or aftermarket audio where extended temp and diagnostics are not required	Choose only for cost-sensitive non-automotive designs lacking thermal/EMC constraints

Compared with TAS5414CQPHPRQ1 and MAX9744AEE+T, the FDA903D-EHT uniquely combines high single-channel output (30 W), full automotive qualification (AEC-Q100 Grade 1), and production-ready diagnostics - making it optimal for safety-aware, thermally constrained automotive audio nodes where reliability and real-time monitoring are mandatory.

Availability

FDA903D-EHT is available at Aetrix Electronics and suitable for car radio, telematics, and e-call systems requiring stable component supply across automotive production lifecycles.

Supply support for FDA903D-EHT 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, Switzerland, specializing in automotive, industrial, and power management ICs with strong vertical integration and AEC-Q100 validation capability.

The FDA903D belongs to ST's FDA family of automotive Class D amplifiers, engineered specifically for high-reliability, low-EMI audio subsystems in modern vehicles - emphasizing diagnostic completeness, wide supply tolerance, and seamless integration with digital audio processors.

FAQ

What is the maximum continuous output power of the FDA903D-EHT into a 4 Ω load?

The FDA903D-EHT delivers 30 W continuous output into 4 Ω at 14.4 V supply with 10% THD at 1 kHz, verified per datasheet Figure 22. This rating assumes proper PCB thermal design with the exposed PowerSSO-36 pad soldered to ≥200 mm² copper area. Derating applies above 85°C ambient.

Does the FDA903D-EHT support analog input signals?

No - the FDA903D-EHT accepts digital audio only via I²S or TDM interfaces. It contains an integrated 108 dB D/A converter but has no analog input pins. Analog sources must be digitized externally (e.g., via codec or DSP) before connection to I²S_SDIN.

How does the open-load detection function during audio playback?

The FDA903D-EHT performs open-load detection in real time during active playback by analyzing output impedance via high-frequency signal injection and current/voltage correlation. Detection thresholds are configurable via I²C registers IB4–IB5 and remain active without interrupting audio - critical for e-call speaker verification.

Can the FDA903D-EHT operate from a 3.3 V supply in low-power standby mode?

Yes - the FDA903D-EHT operates across 3.3 V to 18 V, including functional I²C communication and diagnostic reporting at 3.3 V. Quiescent current drops below 10 mA in standby, enabling use in always-on telematics modules powered directly from low-dropout regulators.

FDA903D-EHT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

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

FDA903D-EHT FAQ

1.How can I place an order for FDA903D-EHT through Aetrix?

Please submit a Request for Quotation (RFQ) for FDA903D-EHT 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 FDA903D-EHT reliable?

The price and inventory of FDA903D-EHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FDA903D-EHT is usually 5 days.

3.What payment methods are accepted for FDA903D-EHT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FDA903D-EHT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FDA903D-EHT?

FDA903D-EHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FDA903D-EHT 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 FDA903D-EHT?

For technical support, including FDA903D-EHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FDA903D-EHT requirements.

6.How does Aetrix verify that FDA903D-EHT is sourced from the original manufacturer or authorized distributors?

All FDA903D-EHT 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 FDA903D-EHT meets industry standards.

7.What is the process for return or replacement of FDA903D-EHT?

All FDA903D-EHT units undergo pre-shipment inspection (PSI). If there is an issue with FDA903D-EHT, 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 FDA903D-EHT part is unused and in its original packaging.

Return procedure for FDA903D-EHT:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…