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STMicroelectronics STA333BW13TR
- Part No.:
- STA333BW13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 36-PowerBFSOP (0.295", 7.50mm Width)
- Datasheet:
-
STA333BW13TR.pdf
- Description:
- IC FULLY INTEG PROC POWERSSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:852
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Product details
Overview
STA333BW13TR from STMicroelectronics is a 2.1-channel, 40 W high-efficiency digital audio system-on-chip (Sound Terminal®) integrating FFX™ ternary/binary PWM amplification, 96 kHz internal DSP processing, I²C control, and configurable audio processing paths. It delivers 2 × 9 W into 4 Ω + 1 × 20 W into 8 Ω in 2.1 binary mode at 18 V, supports 32–192 kHz I²S input, and includes thermal/short-circuit protection. It targets compact stereo soundbars and active subwoofer systems requiring integrated DSP and Class-D efficiency.
For engineers reviewing the STA333BW13TR datasheet, STA333BW13TR pinout, STA333BW13TR application, or STA333BW13TR equivalent, key selection considerations include its 2.1-channel binary PWM output configuration, 100-dB SNR FFX modulation, programmable biquad EQ (5 per channel), DRC/anticlipping modes, and PowerSSO-36 EPD package thermal performance.
Technical Context
The STA333BW13TR implements a fully integrated digital audio processor with three configurable power output modes: ternary stereo + PWM line-out, ternary stereo + PWM output, or binary 2.1-channel (L/R/LFE). Its FFX™ modulation engine operates at 96 kHz internal sample rate with scalable modulation index and selectable noise-shaping topologies (high/low bandwidth).
Audio processing includes up to five user-programmable biquad filters per channel, three coefficient banks for fast EQ preset recall via I²C, dynamic range compression or anticlipping limiter (dual-stage), and AM interference suppression with frequency-switching capability. Input mapping, channel mixing (e.g., sub into L/R), and de-emphasis are software-configurable through dedicated registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 2.1-channel binary PWM (L/R/LFE) or 2-channel ternary PWM + line-out/PWM output - enables flexible speaker topology without external DAC or amplifier stages. |
| Power Output | 2 × 9 W into 4 Ω + 1 × 20 W into 8 Ω at 18 V - supports compact 2.1 speaker systems with independent bass boost and thermal headroom. |
| SNR / Dynamic Range | 100 dB - ensures low-noise playback for high-fidelity consumer audio applications with minimal audible quantization or switching artifacts. |
| Input Sample Rate | 32–192 kHz I²S - accommodates legacy CD, high-res audio, and streaming source compatibility with automatic interpolation. |
| DSP Processing Rate | 96 kHz internal sample rate - provides sufficient oversampling margin for precise biquad filtering and real-time DRC/limiter response. |
| Volume Control Range | +48 dB to –80 dB in 0.5-dB steps - enables fine-grained loudness matching across multi-source systems and compliance with broadcast loudness standards. |
| Protection Features | Thermal overload, short-circuit, invalid-input-detect mute - eliminates need for external fault monitoring circuitry in embedded designs. |
Pinout & Package
STA333BW13TR is housed in PowerSSO-36 EPD (Exposed Pad Down) package - a thermally enhanced surface-mount package with 36 leads and integrated heat slug for direct PCB thermal coupling. The exposed pad must be soldered to a large copper pour for optimal thermal dissipation in high-power audio applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDP | Power supply (4.5–21.5 V) | Main analog/digital supply rail; requires local 100 nF + 10 µF decoupling near pin for PWM stability. |
| GNDP | Analog ground | Separate ground plane connection for analog signal integrity; tied to exposed pad for thermal path. |
| OUTL+/OUTL− | Left channel BTL PWM outputs | Differential PWM drive for 8 Ω or 4 Ω loads; supports 2 × 20 W ternary or 2 × 9 W binary operation. |
| OUTR+/OUTR− | Right channel BTL PWM outputs | Matched to OUTL± for stereo balance; shares same FFX modulation engine timing and gain calibration. |
| OUTSUB+ | Subwoofer PWM output | Single-ended 20 W output (8 Ω); internally mixed from L/R signals or driven independently for LFE content. |
| SDA/SCL | I²C interface | Configures all DSP parameters, volume, presets, and protection thresholds; supports multiple device addressing. |
| LRCK/SDIN/SCLK | I²S digital audio input | Accepts left-justified, right-justified, or I²S format; LRCK edge triggers sample loading for synchronous processing. |
| EAPD | External amplifier power-down | Open-drain output to disable external Class-AB amps during mute or standby; reduces system quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| FFX™ ternary/binary PWM modulation | Enables >90% efficiency at full load while maintaining 100 dB SNR - critical for fanless soundbar thermal design. |
| 5 user-programmable biquads per channel | Supports custom crossover (e.g., 80 Hz LFE split), parametric EQ, and room correction without external DSP hardware. |
| Three EQ coefficient banks | Allows instant recall of bass/treble presets or night-mode profiles via single I²C register write - no firmware reload required. |
| Dual-stage dynamic limiter (DRC/anticlipping) | Prevents speaker damage and audible distortion during transients while preserving perceived loudness in small enclosures. |
| AM interference suppression with frequency switching | Reduces audible heterodyne noise from nearby radio bands (e.g., AM broadcast) by dynamically shifting PWM carrier frequency. |
Applications
| Home Theater Soundbar | Active Subwoofer Module |
|---|---|
|
Use Scenario: Compact all-in-one soundbar with built-in stereo drivers and wireless subwoofer link. IC Role / Device Role / Timing Role: Audio processor, PWM amplifier, and system controller - handles I²S decoding, 2.1 channel routing, bass management, and subwoofer-level synchronization. Use Value: Eliminates need for separate DAC, DSP, and power amp ICs; reduces BOM count and PCB area while enabling factory-tuned EQ and DRC. |
Use Scenario: Self-contained powered subwoofer with line-level input and adjustable crossover. IC Role / Device Role / Timing Role: Digital crossover filter, LFE extraction engine, and high-current PWM driver - processes stereo input, isolates 20–120 Hz band, and drives 8 Ω voice coil. Use Value: Delivers 20 W clean bass output with programmable slope (12/24 dB/octave) and phase alignment - avoids external passive filters and amplifier stages. |
| Smart Speaker Base Unit | USB-C Dock Audio Hub |
|
Use Scenario: Voice-assistant speaker with auxiliary stereo output and subwoofer passthrough. IC Role / Device Role / Timing Role: Audio hub and mixer - accepts I²S from SoC, applies voice-enhancement EQ, routes L/R to main drivers and LFE to sub output. Use Value: Enables simultaneous far-field mic processing and high-quality playback using shared clock domain; soft-mute prevents pop on wake/sleep transitions. |
Use Scenario: Multiport USB-C dock delivering audio to headphones, speakers, and monitor speakers. IC Role / Device Role / Timing Role: High-fidelity audio endpoint - receives I²S from USB audio controller, applies de-emphasis, tone control, and volume scaling before driving amplified outputs. Use Value: Supports 192 kHz playback with zero-latency volume update and automatic invalid-input mute - ensures plug-and-play reliability across host OSes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2.1-channel digital audio system applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STA335BW | Pin- and SW-compatible; adds 5.1-channel support and higher 30 W sub output (8 Ω) | Required for surround-sound systems needing center/rear channel expansion beyond 2.1 | Select when future 5.1 upgrade path or higher subwoofer power is needed; same layout and firmware base. |
| STA559BW | Higher integration: includes 3× 50 W Class-D channels + integrated DC-DC converter; no line-out option | Targeted at larger all-in-one systems requiring >20 W per channel and simplified power architecture | Choose for higher-output soundbases where board space allows larger PowerSSO-48 package and thermal mass. |
Compared with STA333BW13TR, STA335BW extends channel count and sub power while retaining identical feature set and footprint; STA559BW trades flexibility (no line-out, fixed 50 W/channel) for higher output and integrated power management - making it suitable for premium-tier systems where cost-per-watt and integration density outweigh configurability needs.
Availability
STA333BW13TR is available at Aetrix Electronics and suitable for home theater soundbars, active subwoofers, smart speaker base units, and USB-C audio docks requiring stable component supply and long-term production continuity.
Supply support for STA333BW13TR 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 microcontrollers, power management, analog, and audio ICs for industrial, automotive, and consumer markets.
The STA333BW13TR belongs to ST's Sound Terminal® family - designed specifically for space-constrained, high-efficiency audio systems that integrate processing, amplification, and protection in a single chip without external passive components.
FAQ
What are the supported I²S input formats and clocking requirements?
The STA333BW13TR accepts I²S, left-justified, and right-justified formats with MSB-first or LSB-first data ordering. It supports master or slave clocking, with LRCK frequencies from 32 kHz to 192 kHz and programmable SCLK-to-LRCK ratios (e.g., 64×, 128×, 256×). Internal interpolation ensures stable 96 kHz processing regardless of input rate.
How does the FFX™ modulation improve audio quality compared to standard Class-D?
FFX™ uses ternary or binary PWM with advanced noise shaping and compensating pulses to achieve 100 dB SNR and eliminate ultrasonic switching artifacts. Unlike basic Class-D, it maintains linearity across output power levels and suppresses EMI through selectable carrier frequencies and AM interference modes - verified in ST's production test data.
Can the STA333BW13TR drive both 4 Ω and 8 Ω speakers simultaneously?
Yes - in 2.1 binary mode, the left/right channels deliver 9 W each into 4 Ω while the subwoofer channel delivers 20 W into 8 Ω. The device's thermal protection and adaptive overcurrent detection allow safe concurrent operation across mismatched impedances without external current limiting.
Is external EEPROM required for storing EQ presets or configuration?
No - the STA333BW13TR includes three internal coefficient banks for EQ presets, accessible via I²C. All configuration (volume, DRC, crossover, tone) is retained in volatile RAM during operation and can be reloaded from host MCU on power-up; no external non-volatile memory is needed for factory tuning.
STA333BW13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Sound Terminal™
- Package/Case:
- 36-PowerBFSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fully Integrated Processor
- Applications:
- Pre-Amplifier
- Number of Channels:
- 2
- Interface:
- I2C, I2S
- Voltage - Supply:
- 4.5V ~ 21.5V
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Specifications:
- Full Flexible Amplification
- Mounting Type:
- Surface Mount
- Grade:
- -
STA333BW13TR FAQ
1.How can I place an order for STA333BW13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STA333BW13TR 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 STA333BW13TR reliable?
The price and inventory of STA333BW13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STA333BW13TR is usually 5 days.
3.What payment methods are accepted for STA333BW13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STA333BW13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STA333BW13TR?
STA333BW13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STA333BW13TR 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 STA333BW13TR?
For technical support, including STA333BW13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STA333BW13TR requirements.
6.How does Aetrix verify that STA333BW13TR is sourced from the original manufacturer or authorized distributors?
All STA333BW13TR 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 STA333BW13TR meets industry standards.
7.What is the process for return or replacement of STA333BW13TR?
All STA333BW13TR units undergo pre-shipment inspection (PSI). If there is an issue with STA333BW13TR, 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 STA333BW13TR part is unused and in its original packaging.
Return procedure for STA333BW13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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