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STMicroelectronics FDA803U-KBT
- Part No.:
- FDA803U-KBT
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 36-PowerFSOP (0.295", 7.50mm Width)
- Datasheet:
-
FDA803U-KBT.pdf
- Description:
- IC AMP D MONO 45W POWERSSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
FDA803U-KBT from STMicroelectronics is a single-channel Class D automotive audio power amplifier with integrated 108 dB DAC, I²S/TDM digital input (4/8/16-channel), and comprehensive diagnostics. It delivers up to 45 W into 4 Ω at 14.4 V, operates from 3.3–18 V, and supports real-time open-load and DC offset detection during playback-enabling robust telematics, e-call, and car radio audio systems.
For engineers reviewing the FDA803U-KBT datasheet, FDA803U-KBT pinout, FDA803U-KBT application, or FDA803U-KBT equivalent, this device is selected for AEC-Q100-compliant automotive audio designs requiring wide supply range, low quiescent current (<5 mA), CISPR 25 Class V EMI compliance, and configurable I²C diagnostics including thermal warnings and clipping detection.
Technical Context
The FDA803U employs BCD process technology with MOSFET power outputs and embeds the output LC low-pass filter within its feedback loop-ensuring superior frequency response linearity and THD <0.05% at 1 W. Its finite state machine enables five operational modes (Standby, MUTE-PLAY, Diagnostic, ECO, Legacy) controlled via I²C or hardware pins.
Diagnostics include short-to-VCC/GND detection, four-tier thermal warning, hot-spot detection, and open-load monitoring active during audio playback. The device supports legacy mode (no I²C) with four preset configurations and features analog/digital/mixed mute architectures for precise signal control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 25 W @ 4 Ω, 14.4 V, 1 kHz, THD = 1%; enables full-range speaker drive in compact DIN head units |
| Supply Voltage Range | 3.3–18 V; supports emergency battery (3.3 V) and load-dump tolerant operation (up to 18 V) |
| D/A Resolution | 108 dB SNR; achieves high-fidelity audio reproduction with >110 dB dynamic range |
| Digital Input Support | I²S + TDM (4/8/16 channels); allows flexible integration with multi-zone audio processors or telematics SoCs |
| Sampling Frequencies | 44.1 / 48 / 96 / 192 kHz; compatible with CD, streaming, and high-res audio sources |
| Quiescent Current | <5 mA @ 14.4 V; reduces standby power draw in always-on e-call modules |
| EMI Compliance | CISPR 25 Class V (4th ed.); eliminates need for external shielding in single-DIN radio enclosures |
Pinout & Package
Package: PowerSSO-36 exposed pad (slug-up), thermally optimized for automotive under-hood mounting with direct PCB copper thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary power supply input | Accepts 3.3–18 V; powers internal logic and gate drivers; requires local 10 µF ceramic decoupling |
| GND | Power and signal reference ground | Must be connected to exposed thermal pad; shared return for analog/digital/HS outputs |
| OUT+ | High-side bridge output | Drives speaker positive terminal; MOSFET output stage rated for 2 Ω loads |
| OUT− | Low-side bridge output | Completes H-bridge; enables differential speaker connection and reduced EMI radiation |
| SCL / SDA | I²C interface lines | Support 1.8 V / 3.3 V logic; enable full diagnostics configuration and power limiting control |
| MUTE | Hardware mute control | Active-low pin; forces analog mute on falling edge; overrides I²C mute commands |
| CDDIAG | Diagnostics status output | Open-drain flag indicating fault condition (short, open, thermal, clipping) per I²C register mapping |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LC feedback filter | Eliminates external passive filter components while maintaining <±0.1 dB flatness from 20 Hz–20 kHz |
| Play-mode open-load detection | Identifies disconnected speakers without interrupting audio playback-critical for e-call voice path integrity |
| Configurable power limiter | I²C-adjustable gain ceiling prevents amplifier saturation and protects downstream speakers |
| Legacy mode (no I²C) | Four factory-configured settings allow drop-in replacement in legacy designs without firmware changes |
| Hot-spot detection | Monitors localized die temperature gradients to preempt thermal runaway before global shutdown triggers |
Applications
| Car Radio Audio Amplifier | Telematics Voice Output |
|---|---|
Use Scenario: Integrated amplifier in single-DIN automotive head unit driving front/rear speakers. IC Role / Device Role / Timing Role: Primary Class D output stage with embedded DAC and diagnostics; replaces discrete DAC + amplifier + protection IC stack. Use Value: Reduces BOM count by 3+ components and meets CISPR 25 Class V without shielded enclosure. |
Use Scenario: Audio output for vehicle emergency call (e-call) system with voice prompt playback. IC Role / Device Role / Timing Role: Low-quiescent-power audio driver with play-mode open-load detection ensuring voice path continuity. Use Value: Guarantees speaker presence verification during live voice transmission-preventing silent failure in safety-critical calls. |
| Noise/Tone Generator | Automotive Infotainment Subwoofer Driver |
Use Scenario: Generating audible alerts (e.g., ADAS warnings, parking tones) in instrument clusters or center displays. IC Role / Device Role / Timing Role: Compact, efficient tone generator with configurable power limiting to avoid distortion at peak alert volumes. Use Value: Delivers clean 1–5 kHz tones at 25 W into 4 Ω with <0.1% THD, eliminating need for external filtering. |
Use Scenario: Driving 2 Ω subwoofers in premium infotainment systems with dynamic bass enhancement. IC Role / Device Role / Timing Role: High-current Class D channel supporting 2 Ω loads and real-time thermal hotspot monitoring. Use Value: Enables sustained 30 W output into 2 Ω with adaptive thermal derating-avoiding abrupt shutdown during bass transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive Class D amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TAS5414CQDKRQ1 | 4-channel, 12 W/channel @ 4 Ω; no integrated DAC; requires external I²S-to-analog conversion | Better suited for multi-zone audio distribution; lacks FDA803U's play-mode diagnostics and 2 Ω drive capability | Select when scaling to 4 independent zones and external DAC flexibility is prioritized over compactness and diagnostic depth |
| MAX9877EPL+ | Single-channel, 20 W @ 4 Ω; analog input only; no TDM/I²S support; lower efficiency (~82%) | Targeted at cost-sensitive analog-source radios; missing FDA803U's digital interface, wide voltage range, and AEC-Q100 Grade 1 rating | Select only for legacy analog designs where digital input and extended voltage operation are unnecessary |
Compared with TAS5414CQDKRQ1 and MAX9877EPL+, the FDA803U-KBT uniquely integrates high-resolution DAC, 2 Ω load support, and real-time diagnostics active during playback-making it optimal for next-gen telematics and safety-critical audio where space, supply flexibility, and functional safety are paramount.
Availability
FDA803U-KBT is available at Aetrix Electronics and suitable for car radio, telematics, and e-call systems requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for FDA803U-KBT 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-grade analog, power, and microcontroller solutions with deep expertise in BCD process technology and functional safety certification.
The FDA803U belongs to ST's automotive audio power amplifier product line, engineered specifically for space-constrained, high-reliability in-vehicle systems demanding wide supply range, ultra-low EMI, and comprehensive built-in diagnostics.
FAQ
What is the minimum operating voltage for FDA803U-KBT?
The FDA803U-KBT operates down to 3.3 V, enabling compatibility with emergency backup batteries and low-voltage step-down rails in modern vehicle architectures. This extends functionality beyond standard 5.5–18 V automotive ranges and supports fail-operational behavior in e-call modules during brownout conditions.
Does FDA803U-KBT require an external LC filter?
No. The FDA803U-KBT integrates the output LC low-pass filter into its feedback loop, eliminating external passive components. This reduces PCB area, improves phase margin stability, and ensures consistent frequency response linearity across temperature and unit variance-verified per Figure 31–33 in DS12497 Rev 2.
How does the "open load in play" detection work?
The FDA803U-KBT injects a low-level AC test signal superimposed on the audio waveform and monitors impedance response in real time. When speaker disconnection occurs during playback, it detects the resulting impedance shift and reports via CDDIAG pin or I²C register DB3 without muting or interrupting audio-validated in Section 10.4 of the datasheet.
Can FDA803U-KBT operate without I²C configuration?
Yes. In Legacy Mode, the FDA803U-KBT uses four factory-programmed configurations selected by hardware strapping (IB0–IB1 pins). This allows immediate operation with fixed gain, mute behavior, and diagnostics-ideal for retrofitting into existing designs lacking I²C infrastructure or firmware support.
FDA803U-KBT 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:
- -
- Mounting Type:
- Surface Mount
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- PowerSSO-36 EPU
FDA803U-KBT FAQ
1.How can I place an order for FDA803U-KBT through Aetrix?
Please submit a Request for Quotation (RFQ) for FDA803U-KBT 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 FDA803U-KBT reliable?
The price and inventory of FDA803U-KBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FDA803U-KBT is usually 5 days.
3.What payment methods are accepted for FDA803U-KBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FDA803U-KBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FDA803U-KBT?
FDA803U-KBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FDA803U-KBT 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 FDA803U-KBT?
For technical support, including FDA803U-KBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FDA803U-KBT requirements.
6.How does Aetrix verify that FDA803U-KBT is sourced from the original manufacturer or authorized distributors?
All FDA803U-KBT 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 FDA803U-KBT meets industry standards.
7.What is the process for return or replacement of FDA803U-KBT?
All FDA803U-KBT units undergo pre-shipment inspection (PSI). If there is an issue with FDA803U-KBT, 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 FDA803U-KBT part is unused and in its original packaging.
Return procedure for FDA803U-KBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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