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STMicroelectronics STA350BTR
- Part No.:
- STA350BTR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 36-PowerFSOP (0.295", 7.50mm Width)
- Datasheet:
-
STA350BTR.pdf
- Description:
- IC FULLY INTEG PROC POWERSSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:2,444
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Product details
Overview
STA350BTR from STMicroelectronics is a 2.1-channel high-efficiency digital audio system-on-chip (Sound Terminal®) integrating FFX™ Class-D amplifier, DSP, and I²C-controlled audio processing. It delivers up to 2 × 50 W into 6 Ω (stereo ternary PWM), supports 32–192 kHz I²S input, provides 100 dB SNR, and embeds dual independent DRCs with B2DRC anti-clipping capability for automotive infotainment and premium home audio systems.
For engineers reviewing the STA350BTR datasheet, STA350BTR pinout, STA350BTR application, or STA350BTR equivalent, key selection considerations include its 2.1-channel FFX™ output configuration, programmable biquad EQ (up to 8 per channel), LFE-specific bass boosting, thermal/short-circuit protection, and compatibility with STA339BW-series reference designs.
Technical Context
The STA350BTR implements a fully integrated digital audio signal chain: I²S input → sample-rate flexible interpolation (32–192 kHz) → 96 kHz internal DSP engine with 24-bit precision → configurable biquad filtering (3 coefficient banks) → dual-band DRC/EQ-DRC → FFX™ ternary/binary PWM modulation → integrated power stage drivers. All processing is controlled via I²C with 7-bit address selection.
Its architecture supports four hardware-configurable output modes - including stereo ternary, 2.1-mode (L/R binary + LFE ternary), stereo + line-out, and mono-BTL - each with dedicated gain, mute, and protection logic. Thermal warning recovery, zero-detect mute, and invalid-input detection are implemented in hardware with programmable bypass options.
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 and industrial power rails without external DC-DC pre-regulation. |
| Output Power (Stereo) | 2 × 50 W into 6 Ω @ 25 V (ternary PWM); sufficient for mid-range speaker systems without heatsink oversizing. |
| Output Power (2.1 Mode) | 2 × 18 W + 1 × 40 W into 2 × 4 Ω + 1 × 8 Ω @ 25 V; enables discrete LFE channel with higher headroom for subwoofer drive. |
| SNR / Dynamic Range | 100 dB FFX™ typical; ensures low-noise playback critical for high-fidelity audio reproduction in quiet listening environments. |
| Digital Audio Interface | I²S input with MSB/LSB-first support and programmable channel mapping; allows flexible routing from SoC, DSP, or media processor. |
| Processing Sample Rate | 96 kHz internal processing with noise-shaping quantization; supports ultra-low-cutoff digital filters (e.g., <10 Hz high-pass) without aliasing artifacts. |
| DRC & EQ Capability | Two independent DRCs + EQ-DRC mode + 15 preset crossovers; enables simultaneous loudness compensation and bass management without host CPU load. |
| Protection Features | Embedded thermal overload, short-circuit, overcurrent, and invalid-input detection with auto-recovery; reduces need for external monitoring circuitry. |
Pinout & Package
STA350BTR is housed in a PowerSSO-36 package with exposed pad up (slug-up), optimized for thermal dissipation in compact audio modules. The 36-pin QFN-style footprint includes dedicated power, ground, PWM output, analog/digital I/O, and control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCP, VCCN | Main power supply inputs | Accept 5–26 V; separate pins reduce supply coupling between analog and digital domains. |
| GNDP, GNDN | Analog/digital ground returns | Isolated ground paths minimize noise injection into sensitive audio signal paths. |
| OUT1P/OUT1N, OUT2P/OUT2N, OUT3P/OUT3N | Class-D PWM output terminals | Drive speaker loads directly in BTL configuration; support ternary or binary modulation per channel. |
| SDA, SCL | I²C serial control interface | Enable full register-level configuration of gain, EQ, DRC, mute, and protection thresholds. |
| LRCK, BCLK, SDIN | I²S digital audio input | Support master/slave operation; configurable data format (I²S, left-justified, right-justified, DSP). |
| MUTE, EAPD | Hardware mute and enable controls | Provide fast, glitch-free power-down and soft-mute transitions independent of I²C state. |
| FAULT, THERM | Open-drain status outputs | Signal thermal warning or fault condition to MCU for system-level error handling and logging. |
Key Features
| Feature | Design Value |
|---|---|
| FFX™ ternary PWM topology | Enables >90% efficiency at full power while reducing EMI vs. standard Class-D, easing EMC compliance in space-constrained enclosures. |
| Programmable biquad EQ (8/channel) | Allows real-time acoustic correction for speaker response anomalies without external DSP, reducing BOM count and latency. |
| Dual-band DRC (B2DRC) | Permits independent compression of high/mid and low-frequency bands-critical for preventing tweeter damage while preserving bass impact. |
| LFE-specific processing | Provides dedicated 0.125 dB-step bass boost and crossover filtering for subwoofers, eliminating need for external analog LFE circuits. |
| AM interference suppression | Switches PWM carrier frequency to avoid AM radio band (530–1710 kHz), preventing audible heterodyne noise in vehicle audio systems. |
| Auto zero-detect & invalid-input mute | Prevents pop/click on startup, clock loss, or silent input-ensuring clean audio handover in head-unit and streaming applications. |
Applications
| Automotive Infotainment Head Unit | Premium Home Theater Soundbar |
|---|---|
Use Scenario: Integrated audio subsystem in OEM or aftermarket head units driving front/rear speakers and subwoofer. IC Role / Device Role / Timing Role: Digital audio processor and Class-D amplifier controller; handles I²S input, DSP-based tone control, LFE extraction, and PWM generation synchronized to system clock. Use Value: Eliminates need for discrete DAC, analog volume control, and external amplifier drivers-reducing PCB area by >40% and enabling single-chip 2.1-channel solution. | Use Scenario: Compact soundbar requiring high-output stereo imaging plus deep bass extension. IC Role / Device Role / Timing Role: Central audio system-on-chip managing I²S input from TV/Bluetooth SoC, applying room-correction EQ, executing dual-band DRC, and driving full-range drivers + passive radiator. Use Value: Delivers 100 dB SNR and 50 W/channel output in thermally constrained enclosure using only one IC and minimal passives. |
| Smart Speaker with Subwoofer Output | Industrial Audio Display Kiosk |
Use Scenario: Voice-assistant speaker with companion wireless subwoofer requiring synchronized LFE channel. IC Role / Device Role / Timing Role: Audio hub performing voice activity detection preprocessing, multi-band DRC, and time-aligned LFE output with dedicated bass boost and crossover. Use Value: Enables precise phase alignment between satellite and subwoofer channels via programmable delay and coefficient bank switching. | Use Scenario: Public-space kiosk delivering clear speech and alert tones in noisy environments. IC Role / Device Role / Timing Role: Robust audio subsystem providing automatic gain control, de-emphasis, high-pass DC blocking, and thermal-safe 18 W/channel output. Use Value: Maintains intelligibility under continuous operation with embedded thermal shutdown and fault reporting to host controller. |
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 |
|---|---|---|---|
| STA339BWTR | Lower max output (2 × 30 W), no LFE-specific processing, fixed 48 kHz internal rate, no B2DRC mode. | Suitable for cost-sensitive stereo-only systems without subwoofer support. | Select when 2.1 functionality, 96 kHz processing, or programmable biquads are not required. |
| TAS5825MRTWR | TI's 2.1-channel Class-D with 96 kHz processing, but uses proprietary PurePath™ tuning tools; lacks built-in LFE presets and AM suppression modes. | Better suited for consumer audio with GUI-based tuning; less optimized for automotive EMI constraints. | Choose if existing TI ecosystem integration or advanced GUI-based EQ/DRC workflow is prioritized over automotive-grade robustness. |
Compared with STA339BWTR, STA350BTR adds LFE processing, B2DRC, and AM suppression-making it superior for automotive 2.1 systems; versus TAS5825MRTWR, it offers tighter EMI control and factory-presets for faster time-to-market in rugged environments.
Availability
STA350BTR is available at Aetrix Electronics and suitable for automotive infotainment, premium soundbars, and smart speaker systems requiring stable component supply, long-lifecycle support, and production-ready qualification.
Supply support for STA350BTR 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, and analog/audio ICs for automotive, industrial, and consumer markets.
The STA350BTR belongs to ST's Sound Terminal® family-designed specifically for highly integrated, high-efficiency digital audio systems where space, thermal performance, and feature-rich DSP are critical.
FAQ
What is the maximum safe operating voltage for STA350BTR?
The absolute maximum rating is 30 V, but the recommended operating range is 5 V to 26 V. Operation above 26 V risks exceeding thermal limits and triggering protection circuits-even if within absolute max-so 26 V is the practical upper limit for sustained 2.1-mode output.
Does STA350BTR require an external crystal or clock source?
No external crystal is required. The device accepts master clock (MCLK) input from 256× to 768× the audio sample rate (e.g., 12.288 MHz for 48 kHz). Internal PLL generates all required clocks, and MCLK can be derived from the host SoC or audio codec.
Can STA350BTR drive 3 Ω speakers in mono-BTL mode?
Yes-it delivers 1 × 90 W into 3 Ω at 24.5 V in mono-BTL mode, as specified in the datasheet. This requires proper PCB layout for current handling, thermal vias under the exposed pad, and matching output filter components rated for ≥10 A peak current.
How many biquad filters can be active simultaneously per channel?
Up to eight user-programmable biquads per channel are supported, with three coefficient banks for fast recall via I²C. All eight operate concurrently in the signal path, enabling complex equalization such as parametric bass shelf + midrange notch + treble lift without pipeline stalls.
STA350BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Sound Terminal™
- Package/Case:
- 36-PowerFSOP (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:
- 5V ~ 26V
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Specifications:
- Full Flexible Amplification
- Mounting Type:
- Surface Mount
- Grade:
- -
STA350BTR FAQ
1.How can I place an order for STA350BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STA350BTR 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 STA350BTR reliable?
The price and inventory of STA350BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STA350BTR is usually 5 days.
3.What payment methods are accepted for STA350BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STA350BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STA350BTR?
STA350BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STA350BTR 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 STA350BTR?
For technical support, including STA350BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STA350BTR requirements.
6.How does Aetrix verify that STA350BTR is sourced from the original manufacturer or authorized distributors?
All STA350BTR 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 STA350BTR meets industry standards.
7.What is the process for return or replacement of STA350BTR?
All STA350BTR units undergo pre-shipment inspection (PSI). If there is an issue with STA350BTR, 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 STA350BTR part is unused and in its original packaging.
Return procedure for STA350BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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