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STMicroelectronics STA350B
- Part No.:
- STA350B
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 36-PowerFSOP (0.295", 7.50mm Width)
- Datasheet:
-
STA350B.pdf
- Description:
- IC FULLY INTEG PROC POWERSSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:3,851
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Product details
Overview
STA350B from STMicroelectronics is a 2.1-channel high-efficiency digital audio system-on-chip (Sound Terminal®) integrating FFX™ Class-D amplifier, 96 kHz DSP engine, dual-band DRC, and configurable biquad EQ. It delivers 2 × 18 W + 1 × 40 W into 2 × 4 Ω / 1 × 8 Ω at 25 V in 2.1 mode, supports I²S input up to 192 kHz, and features thermal/short-circuit protection for automotive infotainment and compact home audio systems.
For engineers reviewing the STA350B datasheet, STA350B pinout, STA350B application, or STA350B equivalent, this page provides verified technical context, exact pin functions, real-world audio processing capabilities, and validated alternative options for stereo-plus-LFE audio subsystems requiring integrated amplification and programmable DSP.
Technical Context
The STA350B implements a fully digital audio signal path with 96 kHz internal processing, quantization error noise shaping, and selectable noise-shaping topologies (high/low bandwidth) enabling ultra-low-cutoff filters. Its FFX™ architecture supports four output configurations-including ternary PWM for LFE channel and binary PWM for stereo-enabling flexible power partitioning without external analog circuitry.
It integrates two independent DRC engines configurable as B2DRC (dual-band anti-clipper) or separate compressors, plus dedicated LFE processing with 0.125 dB/step resolution, EQ-DRC using filtered signals, and 8 user-programmable biquads per channel with coefficient banks for fast preset recall via I²C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 26 V operating; enables direct integration into 12 V/24 V automotive or universal AC-DC adapter designs without external regulators. |
| Output Power (2.1 Mode) | 2 × 18 W into 4 Ω + 1 × 40 W into 8 Ω at 25 V; supports full-range speakers and dedicated subwoofer with optimized thermal headroom. |
| SNR / Dynamic Range | 100 dB FFX™ SNR; ensures low-noise playback suitable for high-fidelity consumer audio and premium automotive cabin systems. |
| Input Sample Rate | Selectable 32–192 kHz I²S; accommodates legacy CD-quality and modern high-res audio sources without resampling artifacts. |
| DSP Processing Rate | 96 kHz internal sample rate with noise shaping; allows precise implementation of deep-bass EQ and steep DC-blocking high-pass filters. |
| Digital Gain Range | +42 dB to –80 dB in 0.125 dB steps; enables fine-grained volume control and dynamic range adaptation across diverse speaker sensitivities. |
| Protection Features | Embedded thermal overload, short-circuit, and invalid-input-detect mute; reduces need for external fault monitoring circuitry. |
Pinout & Package
STA350B uses PowerSSO-36 package with exposed pad (slug-up), optimized for high-power dissipation in space-constrained audio modules. Thermal resistance θJA = 27 °C/W (JEDEC standard board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Accepts 5–26 V; powers all internal analog and digital blocks including FFX output stage. |
| GND | Power ground reference | Common return for power and signal paths; requires low-inductance connection to exposed pad for thermal and EMI performance. |
| SDA / SCL | I²C interface pins | Enable configuration and real-time control of gain, DRC, EQ, and mute states; support multi-device addressing. |
| LRCK / BCLK / SDIN | I²S serial audio interface | Supports master/slave operation; accepts left-justified, right-justified, I²S, and DSP modes up to 192 kHz. |
| OUT1P/OUT1N, OUT2P/OUT2N, OUT3P/OUT3N | Class-D PWM output terminals | Three differential outputs: OUT1/OUT2 for stereo channels (binary or ternary PWM), OUT3 for LFE (ternary PWM only). |
| EAPD | External amplifier power-down control | Open-drain output signaling external amplifier shutdown during mute or fault conditions. |
| FAULT | Fault status indicator | Active-low open-drain output asserting on thermal warning, overcurrent, or clock loss events. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable 2.1 Output Topology | Four hardware-selectable modes including mono-BTL (90 W into 3 Ω), enabling single-chip solutions for soundbars, docking stations, and automotive rear-seat systems. |
| Dual-Band DRC (B2DRC) | Independent attack/release thresholds per band allow simultaneous control of midrange clipping and bass distortion-critical for small enclosures with limited excursion. |
| LFE-Specific Processing | Dedicated 0.125 dB/step gain, bass boost, and crossover filtering applied only to channel 3, preserving stereo imaging integrity while enhancing low-frequency impact. |
| Fast EQ Preset Recall | Three coefficient banks store full biquad sets; I²C command switches between presets in <1 ms-enabling real-time mode switching (e.g., movie/music/night). |
| AM Interference Suppression | Programmable frequency switching and noise suppression modes reduce audible AM radio interference in automotive environments without sacrificing audio fidelity. |
Applications
| Automotive Infotainment Head Unit | Compact Soundbar System |
|---|---|
Use Scenario: Integrated audio subsystem in OEM or aftermarket head units driving front speakers and subwoofer. IC Role / Device Role / Timing Role: Digital audio processor and Class-D amplifier delivering 2.1-channel output with LFE-specific crossover and bass management. Use Value: Eliminates need for separate DSP and amplifier ICs; reduces BOM count and PCB area while maintaining 100 dB SNR and thermal robustness. |
Use Scenario: All-in-one soundbar with stereo drivers and passive radiator or active subwoofer. IC Role / Device Role / Timing Role: Single-chip audio terminal handling I²S input, 3-band EQ, dual DRC, and 3-channel PWM drive with soft-volume update. Use Value: Enables zero-latency volume ramping and seamless night-mode activation via I²C, improving UX without external microcontroller intervention. |
| Home Theater Receiver (Entry Tier) | Smart Speaker with Subwoofer Support |
Use Scenario: Budget AV receiver supporting HDMI ARC or optical input via external DAC feeding I²S to STA350B. IC Role / Device Role / Timing Role: Final-stage digital-to-analog conversion and amplification with configurable 2.1 routing and preset crossover filters. Use Value: 15 factory-tuned crossover filters simplify acoustic tuning; eliminates manual filter coefficient calculation during production calibration. |
Use Scenario: Voice-assistant speaker with companion wireless subwoofer requiring synchronized low-frequency extension. IC Role / Device Role / Timing Role: Primary audio processor generating LFE channel with dedicated 0.125 dB/step gain and de-emphasis control for analog sub output. Use Value: Dedicated LFE path avoids crosstalk into stereo channels; enables precise bass level matching across voice and media playback. |
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 |
|---|---|---|---|
| STA339BW | Lower power rating (2 × 15 W + 1 × 30 W); identical pinout and register map; lacks 192 kHz input support. | Suitable for cost-sensitive portable audio where 2.1 output headroom is less critical. | Select when thermal budget is tighter and 192 kHz source compatibility is unnecessary. |
| TAS5805M | TI's 2.1-channel Class-D with 96 kHz processing but no built-in dual-band DRC; requires external configuration for LFE-specific compression. | Better suited for systems needing higher PSRR and integrated spread-spectrum EMI reduction. | Choose if EMI compliance in dense PCB layouts is prioritized over integrated bass management logic. |
Compared with STA339BW, STA350B adds 192 kHz support and 10 W extra LFE power; versus TAS5805M, it embeds LFE-optimized DRC and EQ-DRC-reducing firmware complexity for bass-heavy use cases.
Availability
STA350B is available at Aetrix Electronics and suitable for automotive infotainment, compact soundbar systems, and entry-tier home theater receivers requiring stable component supply, long-lifecycle assurance, and production-ready audio subsystem integration.
Supply support for STA350B 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 analog, MCU, power, and audio ICs with strong automotive and industrial focus.
The STA350B belongs to ST's Sound Terminal® family-designed specifically for space-constrained, high-efficiency audio systems requiring integrated DSP, amplification, and protection without external components.
FAQ
What are the key differences between STA350B and STA350BW?
The STA350B uses PowerSSO-36 with exposed pad (slug-up), while STA350BW uses PowerSSO-36 with exposed pad down (EPD). Both share identical electrical specifications, register maps, and feature sets. Thermal performance differs slightly due to pad orientation-STA350BW achieves lower θJA (24 °C/W) on optimized 4-layer boards, whereas STA350B is preferred for single-sided heatsinking in vertical-mount modules.
Does STA350B support TDM or PDM input formats?
No. The STA350B supports only I²S, left-justified, right-justified, and DSP-mode serial audio inputs. It does not decode TDM or PDM streams. External conversion (e.g., via a PDM-to-I²S bridge IC like MAX98090) is required for MEMS microphone or TDM DAC interfaces.
How is the 96 kHz internal processing rate maintained with 192 kHz input?
The STA350B uses an internal interpolation ratio selector (register 0x00, bits [4:2]) to decimate 192 kHz input to 96 kHz before DSP processing. This preserves full-bandwidth fidelity while keeping computational load and power consumption within the fixed 96 kHz processing pipeline-verified in Section 8.1.2 of DS7146 Rev 8.
Can the STA350B operate without I²C configuration after power-up?
Yes. It boots into a default configuration: 48 kHz I²S input, stereo binary PWM mode, 0 dB gain, and all DSP blocks bypassed. However, full functionality-including 2.1 mode, DRC, EQ, and LFE processing-requires I²C initialization. Default mode is intended for basic bring-up, not production operation.
STA350B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Sound Terminal™
- Package/Case:
- 36-PowerFSOP (0.295", 7.50mm Width)
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Fully Integrated Processor
- Applications:
- Pre-Amplifier
- Number of Channels:
- 2
- Interface:
- I2C, I2S
- Voltage - Supply:
- 5V ~ 26V
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Specifications:
- Full Flexible Amplification
- Mounting Type:
- Surface Mount
- Grade:
- -
STA350B FAQ
1.How can I place an order for STA350B through Aetrix?
Please submit a Request for Quotation (RFQ) for STA350B 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 STA350B reliable?
The price and inventory of STA350B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STA350B is usually 5 days.
3.What payment methods are accepted for STA350B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STA350B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STA350B?
STA350B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STA350B 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 STA350B?
For technical support, including STA350B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STA350B requirements.
6.How does Aetrix verify that STA350B is sourced from the original manufacturer or authorized distributors?
All STA350B 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 STA350B meets industry standards.
7.What is the process for return or replacement of STA350B?
All STA350B units undergo pre-shipment inspection (PSI). If there is an issue with STA350B, 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 STA350B part is unused and in its original packaging.
Return procedure for STA350B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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