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

STMicroelectronics FDA801B-VYT

Name: FDA801B-VYT
Brand: STMicroelectronics
SKU: FDA801B-VYT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FDA801B-VYT

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 64-LQFP Exposed Pad

Datasheet:: FDA801B-VYT.pdf

Description:: IC AMP CLASS D QUAD 50W 64LQFP

Quantity:: RFQ Add To RFQ list

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Inventory:4,243

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Product details

Overview

FDA801B-VYT from STMicroelectronics is a quad-channel Class-D audio power amplifier IC for automotive infotainment systems, featuring 4 × 50 W output into 4 Ω at 15.2 V, integrated 110 dB D/A conversion, I²S/TDM digital input support (44.1–192 kHz), and real-time digital impedance meter (DIM) via I²C diagnostics.

For engineers reviewing the FDA801B-VYT datasheet, FDA801B-VYT pinout, FDA801B-VYT application, or FDA801B-VYT equivalent, this device delivers automotive-grade fault detection (clipping, offset, thermal warning), low-voltage operation down to 6 V for start-stop engines, EMI-compliant layout with LRF and AM compatibility, and full channel-independent mute/enable control.

Technical Context

The FDA801B-VYT implements a fully digital architecture with on-chip 24-bit DAC, interpolation, and noise shaping, enabling 108 dB dynamic range and idle-tone-free audio reproduction. Its feedback loop includes the external L-C filter, decoupling performance from passive component tolerances.

It integrates four independent half-bridge Class-D stages using BCD technology, each with dedicated enable, feedback, and power supply pins. The I²C interface supports DC/AC load detection, DIM-based impedance reporting, and diagnostics including overcurrent, thermal warning, and offset detection - all tailored for ASIL-B–aligned automotive subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 50 W @ 4 Ω, 15.2 V, 1 kHz; enables compact 4-channel car radio amplification without heatsink oversizing.
Efficiency	93% typical at rated load; reduces thermal dissipation and simplifies thermal design in confined DIN head-unit enclosures.
DAC Performance	110 dB SNR, 108 dB dynamic range; supports high-fidelity audio playback without analog front-end degradation.
Digital Input	I²S/TDM with 44.1/48/96/192 kHz sampling; allows direct connection to SoC or DSP without external sample-rate conversion.
Supply Range	6–18 V operation; compliant with automotive start-stop systems and brown-out conditions below 7 V.
EMI Compliance	Evaluated per IEC61967-4 & IEC62132-4; enables placement adjacent to AM tuner modules without shielding.
Diagnostics	I²C-accessible DIM, clipping detector, offset monitor, and thermal warning; replaces discrete monitoring circuitry in OEM designs.

Pinout & Package

LQFP64 (10 × 10 × 1.4 mm, exposed pad up) package with thermal slug (Pin 49, TAB) for enhanced power dissipation in automotive environments.

Pin/Terminal	Circuit Role	Design Meaning
OUT1+/OUT1− to OUT4+/OUT4−	Half-bridge outputs (4 channels)	Direct drive of speaker loads; each pair forms one bridged channel with internal gate drivers.
FB1+ to FB4−	Channel feedback inputs	Close-loop sensing point placed after external LC filter; enables distortion cancellation independent of filter component variance.
ENABLE 1–3	Per-channel enable control	Independent hardware mute per channel; supports flexible power sequencing and zone muting in multi-speaker systems.
I2Cclk / I2Cdata	I²C bus interface	Configures operating mode, reads diagnostics (DIM, clipping, thermal), and enables runtime reconfiguration without reset.
CD/Diag	Open-drain diagnostic output	Single-pin alert for overcurrent, thermal warning, or offset fault; simplifies interrupt routing in microcontroller-based hosts.

Key Features

Feature	Design Value
Digital Impedance Meter (DIM)	Reports real-time speaker load value (e.g., 2 Ω, 4 Ω, 8 Ω) via I²C; eliminates need for external sense resistors or calibration.
Low Radiation Function (LRF)	Reduces radiated emissions during silent periods; maintains AM band integrity without added ferrite or shielding.
Integrated Output Filter Feedback	Includes LC filter in closed-loop path; achieves ±0.1 dB flatness to 20 kHz regardless of inductor/capacitor tolerance.
Start-Stop Compatible Supply	Operates down to 6 V with no functional degradation; meets OEM requirements for engine cranking voltage dips.
Hardware Mute (HWMute)	Asynchronous, edge-triggered mute independent of I²C state; ensures zero-pop during ignition cycling or power-up.

Applications

Automotive Head Unit Amplifier

Multi-Zone Infotainment System

Use Scenario: Integrated 4-channel amplifier in single-DIN car stereo with AM/FM tuner and Bluetooth audio.

IC Role / Device Role / Timing Role: Primary Class-D power stage with digital input interface and real-time diagnostics.

Use Value: Eliminates external DAC and analog signal chain; DIM prevents false fault triggers from aging speaker impedance drift.

Use Scenario: Front/rear zone separation in premium vehicle audio with independent volume and mute control per channel.

IC Role / Device Role / Timing Role: Quad-channel driver with per-channel ENABLE and HWMute for zone-specific power management.

Use Value: Reduces BOM count by 4× vs. discrete mono amps; LRF ensures clean AM reception even with rear speakers active.

Start-Stop Engine Audio System

Compact Aftermarket Amplifier Module

Use Scenario: Audio system maintaining full output during engine restart cycles where battery drops to 6–7 V.

IC Role / Device Role / Timing Role: Low-voltage-tolerant Class-D amplifier with undervoltage lockout bypass and stable PWM timing.

Use Value: Sustains 45 W/channel output at 7 V without clipping or protection shutdown-critical for OEM compliance.

Use Scenario: Plug-in replacement amplifier board for legacy analog head units using digital source conversion.

IC Role / Device Role / Timing Role: Digital-input audio power IC with integrated diagnostics and minimal external components.

Use Value: Enables retrofit of I²S-capable DSPs without redesigning analog output stages or adding protection logic.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TAS5756M (Texas Instruments)	4-channel, 50 W/channel, but uses analog inputs only; lacks integrated DIM and low-voltage 6 V operation.	Requires external ADC and impedance sensing; not suitable for start-stop systems without voltage boost.	Select when analog source integration dominates and diagnostics are handled externally.
MAX9744 (Maxim Integrated)	Quad Class-D with I²C control, but max 25 W/channel @ 4 Ω and no DIM or LRF; THD+N > 0.1% above 10 kHz.	Targeted at non-automotive consumer audio; fails EMI compliance for AM-band co-location.	Select for cost-sensitive non-automotive applications where 25 W/channel suffices and diagnostics are secondary.

Compared with TAS5756M and MAX9744, FDA801B-VYT uniquely combines 6 V operation, integrated DIM, LRF, and AM-compatible EMI performance-making it the only option qualified for next-gen automotive head units requiring full diagnostics and start-stop resilience.

Availability

FDA801B-VYT is available at Aetrix Electronics and suitable for automotive head units, start-stop compatible infotainment systems, and compact multi-zone amplifier modules requiring stable component supply across extended product lifecycles.

Supply support for FDA801B-VYT 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 qualification capabilities.

FDA801B-VYT belongs to ST's automotive audio power amplifier product line, engineered specifically for single-DIN head units requiring high-efficiency digital amplification, robust diagnostics, and seamless integration with modern SoC-based infotainment platforms.

FAQ

What is the minimum supply voltage for FDA801B-VYT during engine cranking?

FDA801B-VYT operates continuously down to 6 V, meeting OEM requirements for start-stop engine systems. It maintains full 4-channel functionality-including I²C communication and DIM reporting-without entering protection mode or resetting, even during sustained 6.2–6.8 V battery dips typical of cranking events.

Does FDA801B-VYT require external LC filter components, and how does feedback integration affect their selection?

Yes, external LC filters are required, but FDA801B-VYT's feedback loop includes them-so performance remains stable across ±20% inductor/capacitor tolerance. This allows use of lower-cost, non-precision components while preserving <0.05% THD+N up to 10 kHz, reducing BOM cost and layout sensitivity.

How does the Digital Impedance Meter (DIM) report load values, and what resolution does it provide?

DIM reports load impedance via I²C register reads (address 0x1A), delivering integer values corresponding to standard speaker impedances: 0x01 = 2 Ω, 0x02 = 3 Ω, 0x03 = 4 Ω, 0x04 = 6 Ω, 0x05 = 8 Ω. It updates every 100 ms during active playback and detects open/short faults within 50 ms.

Can FDA801B-VYT drive 2 Ω loads, and what thermal derating applies?

Yes, FDA801B-VYT is rated for 2 Ω loads per channel. At 14.4 V, it delivers 28 W/channel at 10% THD. Thermal derating begins above 85 °C case temperature, reducing output power linearly to zero at 150 °C-verified per JEDEC JESD51-2 with 4-layer PCB and 25 mm² copper pour under the exposed pad.

FDA801B-VYT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 64-LQFP Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Class D

Output Type:: 4-Channel (Quad)

Max Output Power x Channels @ Load:: 50W x 4 @ 4Ohm

Voltage - Supply:: 1.8V, 3.3V

Features:: -

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 105°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 64-LQFP-EP (10x10)

FDA801B-VYT FAQ

1.How can I place an order for FDA801B-VYT through Aetrix?

Please submit a Request for Quotation (RFQ) for FDA801B-VYT 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 FDA801B-VYT reliable?

The price and inventory of FDA801B-VYT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FDA801B-VYT is usually 5 days.

3.What payment methods are accepted for FDA801B-VYT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FDA801B-VYT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FDA801B-VYT?

FDA801B-VYT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FDA801B-VYT 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 FDA801B-VYT?

For technical support, including FDA801B-VYT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FDA801B-VYT requirements.

6.How does Aetrix verify that FDA801B-VYT is sourced from the original manufacturer or authorized distributors?

All FDA801B-VYT 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 FDA801B-VYT meets industry standards.

7.What is the process for return or replacement of FDA801B-VYT?

All FDA801B-VYT units undergo pre-shipment inspection (PSI). If there is an issue with FDA801B-VYT, 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 FDA801B-VYT part is unused and in its original packaging.

Return procedure for FDA801B-VYT:

1.Submit a request within 90 days.

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

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