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STMicroelectronics STA333IS
- Part No.:
- STA333IS
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 30-WFBGA, CSPBGA
- Datasheet:
-
STA333IS.pdf
- Description:
- IC FULLY INTEG PROCESSOR CSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,661
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Product details
Overview
STA333IS from STMicroelectronics is a 2-channel, high-efficiency digital audio amplifier IC integrating FFX™ ternary PWM power output stages, digital audio processing, and I²C/I²S interface control. It delivers up to 10 W + 10 W into 8 Ω in BTL mode, supports 32–192 kHz sampling rates, achieves 100 dB SNR, and operates from 4.5 V to 20 V supply - deployed in LCD audio systems and wireless speaker cradles.
For engineers reviewing the STA333IS datasheet, STA333IS pinout, STA333IS application, or STA333IS equivalent, key selection considerations include its integrated thermal/short-circuit protection, software-controllable volume/mute per channel, AM interference suppression modes, and CSP 5×6 package compatibility with compact digital speaker designs.
Technical Context
The STA333IS implements a dual-channel FFX™ (Full-Forward eXtended) architecture with four independent half-bridge power stages configured as two full bridges. Its digital signal path includes 24-bit precision, 96 kHz internal processing, and programmable DC-cut filtering at 2 Hz.
Control is handled via I²C for register configuration and I²S for stereo audio data input, supporting left-justified, right-justified, and I²S formats. Advanced features include automatic zero-detect mute, invalid-input detection, and variable max-power correction using dedicated registers (0x27–0x28).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 10 W + 10 W into 8 Ω (BTL, THD = 10%, VCC = 13 V) |
| SNR / Dynamic Range | 100 dB - enables high-fidelity playback without audible quantization noise in consumer audio |
| Sampling Rate Support | 32–192 kHz - covers CD, DVD, Blu-ray, and high-res audio source compatibility |
| Digital Gain Range | –80 dB to +48 dB in 0.5 dB steps - allows precise loudness matching across multi-source systems |
| Supply Voltage Range | 4.5 V to 20 V - supports wide-input DC power supplies common in LCD monitors and portable docks |
| Thermal Shutdown Threshold | 140–160 °C (typ. 150 °C) - protects against sustained overload in enclosed speaker enclosures |
| Short-Circuit Detection | At startup: Out–Vcc, Out–Gnd, Out1B–Out2A - prevents latch-up during power-on sequencing |
Pinout & Package
The STA333IS is housed in a CSP 5×6 array package (2.8 mm × 2.4 mm, 0.4 mm pitch), optimized for low-inductance, high-density PCB layouts in space-constrained audio modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1A / OUT1B OUT2A / OUT2B |
Power Output Terminals (H-Bridge Pairs) | Drive left/right speaker loads in BTL configuration; require external LC filters for EMI compliance |
| VCC1 / VCC2 GND1 / GND2 |
Analog Power Rails | Independent upper/lower MOSFET supplies per channel - enable balanced current sourcing/sinking and reduce crosstalk |
| LRCKI / BICKI / SDI | I²S Audio Interface Inputs | Accept stereo PCM data with frame sync, bit clock, and serial data - support MSB-first and LSB-first formats |
| SCL / SDA | I²C Control Interface | Configure volume, mute, automodes, fault recovery, and thermal limits via 7-bit slave address (0x4C or 0x4D) |
| VDD_DIG / GND_DIG VDD_PLL / GND_PLL VDDREG / GNDREG |
Digital & Reference Supplies | Isolate noise-sensitive PLL, digital core, and analog reference domains - mandatory separate decoupling per rail |
Key Features
| Feature | Design Value |
|---|---|
| FFX™ Ternary PWM Modulation | Reduces switching losses vs. binary PWM, enabling >90% efficiency at mid-power levels in compact CSP packages |
| AM Interference Suppression | Configurable frequency-switching modes shift PWM carrier away from AM radio band (530–1710 kHz) without audible artifacts |
| Automated Mute Functions | Zero-detect and invalid-input mute prevent pop/click on silence or stream dropout - no host MCU intervention required |
| Embedded Protection Suite | Real-time short-circuit, thermal warning (130 °C), and thermal shutdown (150 °C) with hysteresis - eliminates need for external supervisors |
| Software Volume Update | Zero-crossing volume changes avoid transient clicks; individual channel + master gain control simplifies UI integration |
Applications
| LCD Monitor Audio System | DVD Player Integrated Amplifier |
|---|---|
|
Use Scenario: Embedded stereo amplification in 15–24-inch LCD monitors with HDMI/line-in inputs. IC Role / Device Role / Timing Role: Digital audio processor and Class-D power stage - accepts I²S from video SoC, applies DC-cut and volume scaling, drives 4–8 Ω speakers directly. Use Value: Eliminates external DAC and discrete MOSFETs; 100 dB SNR ensures clean dialogue reproduction without background hiss. |
Use Scenario: Compact all-in-one DVD player with built-in 2.0 speaker outputs. IC Role / Device Role / Timing Role: Audio subsystem controller - receives SPDIF-to-I²S converted stream, applies ALC for dynamic range compression, and delivers amplified output to passive speakers. Use Value: Automatic invalid-input mute suppresses noise during disc spin-up or format errors; 4.5–20 V operation accommodates varied AC adapter outputs. |
| Wireless Speaker Cradle | Digital Soundbar Module |
|
Use Scenario: Charging dock for smartphones/tablets with Bluetooth audio streaming and auxiliary line-in. IC Role / Device Role / Timing Role: Dual-role interface IC - routes I²S from BT SoC or line-in ADC, manages channel mapping, and controls EAPD for power-gating during idle. Use Value: Software volume update with zero-crossing prevents click during Bluetooth volume sync; CSP package enables <3 mm board height. |
Use Scenario: Slim-profile soundbar with HDMI ARC and optical input, requiring minimal external components. IC Role / Device Role / Timing Role: Primary audio power IC - processes 2-channel PCM from ARC receiver, applies AM-noise suppression for TV proximity, and drives dual 10 W woofers. Use Value: 576×fS input mode supports HDMI 2.0 audio clocking; embedded thermal protection avoids derating in sealed aluminum enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-channel digital Class-D amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TAS5756M | Higher 15 W/channel output, integrated DSP with EQ, but requires external boost converter for >12 V operation | Better suited for active soundbars needing parametric EQ; lacks native 576×fS HDMI clock support | Select if advanced audio processing and higher power are prioritized over single-supply simplicity |
| MAX98357A | 3.3 V only digital supply, no analog rail flexibility; lower 3.2 W/channel output; no thermal warning register | Targeted at battery-powered portable speakers - lacks the robust protection and wide-VCC range of STA333IS | Select for ultra-low-cost, low-power USB-C speakers where 4.5–20 V operation is unnecessary |
Compared with TAS5756M and MAX98357A, the STA333IS uniquely balances wide supply range (4.5–20 V), embedded AM suppression, and comprehensive fault reporting - making it optimal for cost-sensitive, mains-powered consumer displays and docks requiring reliability without external supervision.
Availability
STA333IS is available at Aetrix Electronics and suitable for LCD monitor audio systems, DVD player amplifiers, and wireless speaker cradles requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for STA333IS 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 power management, analog, microcontrollers, and automotive ICs.
The STA333IS belongs to the Sound Terminal® family - designed specifically for cost-effective, high-efficiency all-digital audio amplification in space-constrained consumer electronics with minimal external components.
FAQ
What is the recommended PCB layout practice for the STA333IS CSP package?
Use separate copper pours for each power domain (VCC1/GND1, VCC2/GND2, VDD_DIG/GND_DIG), place 100 nF ceramic decoupling capacitors within 2 mm of each supply pin, and route OUT1A/OUT1B and OUT2A/OUT2B differentially with symmetric trace lengths and tight coupling to minimize EMI radiation. Thermal vias under the exposed pad are mandatory for junction temperature control.
Does the STA333IS support I²S data format auto-detection?
No - the STA333IS requires explicit register configuration (via I²C address 0x03, bits [3:0]) to select I²S, left-justified, or right-justified format. It does not auto-negotiate; format mismatch causes silent or distorted output. The supported formats are documented in Table 16 of the datasheet.
How does the automatic volume control (AVC) limit maximum power?
The AVC function uses register 0x34 (output limit register) to dynamically clamp digital gain when output power approaches thermal or voltage limits. It reads real-time current/voltage feedback from internal sense circuits and reduces gain in 0.5 dB steps - preventing sustained overtemperature without abrupt muting.
Can the STA333IS drive 4 Ω speakers in BTL mode?
Yes - the datasheet specifies 10 W + 10 W into 8 Ω at THD = 10%; driving 4 Ω increases current demand and thermal stress. Derating to 7 W per channel is recommended for continuous operation. Ensure PCB copper area and airflow meet RTh(j-a) ≤ 45 °C/W per the ST reference board spec.
STA333IS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Sound Terminal™
- Package/Case:
- 30-WFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fully Integrated Processor
- Applications:
- Pre-Amplifier
- Number of Channels:
- 2
- Interface:
- I2S
- Voltage - Supply:
- 4.5V ~ 20V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Specifications:
- Direct Digital Amplification
- Mounting Type:
- Surface Mount
- Grade:
- -
STA333IS FAQ
1.How can I place an order for STA333IS through Aetrix?
Please submit a Request for Quotation (RFQ) for STA333IS 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 STA333IS reliable?
The price and inventory of STA333IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STA333IS is usually 5 days.
3.What payment methods are accepted for STA333IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STA333IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STA333IS?
STA333IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STA333IS 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 STA333IS?
For technical support, including STA333IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STA333IS requirements.
6.How does Aetrix verify that STA333IS is sourced from the original manufacturer or authorized distributors?
All STA333IS 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 STA333IS meets industry standards.
7.What is the process for return or replacement of STA333IS?
All STA333IS units undergo pre-shipment inspection (PSI). If there is an issue with STA333IS, 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 STA333IS part is unused and in its original packaging.
Return procedure for STA333IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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