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Sound Terminal 2-channel high-efficiency digital audio system
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The STA333IS is an integrated circuit comprising digital audio processing, digital amplifier control and an FFXpower output stage to create a high-power, single-chip FFX solution for all-digital amplification with high quality and high efficiency.

The STA333IS power section consists of four independent half-bridge stages. Two channels can be provided by two full bridges, delivering up to 10 W + 10 W of power.

Also featured in the STA333IS are new advanced modes for reducing AM radio interference. The serial audio data input interface accepts all possible formats, including the popular I2S format. Two channels of FFXprocessing are provided.

The STA333IS is part of the Sound Terminal®family that provides full digital audio streaming to the speaker, offering cost effectiveness, low-power dissipation and sound enrichment.

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Errata Sheet
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Key Features

  • Wide-range supply voltage (4.5 V - 20 V)
  • 2 channels of ternary PWM (stereo mode)
  • 2 channels of 24-bit FFX
  • 100 dB SNR and dynamic range
  • Selectable 32- to 192-kHz input sampling rates
  • Digital gain -80 dB to +48 dB in 0.5 dB steps
  • Software volume update
  • Individual channel and master gain/attenuation
  • Individual channel and master software and hardware mute
  • Independent channel volume bypass
  • Automatic zero-detect mute
  • Automatic invalid input detect mute
  • Short-circuit detection at startup (Out-Vcc, Out-Gnd, Out 1b-Out 2a)
  • 2-channel I2S input data interface
  • 2 Hz DC cut filter (input)
  • Input channel mapping
  • Automatic volume control for limiting maximum power
  • 96 kHz internal processing sampling rate, 24-bit precision
  • Advanced modes for AM interference frequency switching and noise suppression
  • Embedded thermal-overload and short-circuit protection
  • Video application: 576 * fSinput mode support

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS8917: Sound Terminal® 2-channel high-efficiency digital audio system
3.0 1,595 KB

Application Notes

Description Version Size
AN3340: Loudspeaker characterization and compensation
1.3 3,944 KB
AN4199: Two-layer demonstration board based on the STA333IS
1.0 2,420 KB
AN4200: Four-layer demonstration board based on the STA333IS
1.0 2,059 KB
AN4233: Sound Terminal®: a method for measuring the total thermal resistance (Rth) in the final application
1.0 240 KB

Presentations & Training Material

Training Material

Description Version Size
Learn the basics about STSpeakerSafe technology
1.0 197 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-CCA053V1 Sound Terminal based on the STA333IS 2.0 channel high-efficiency digital audio system

Publications and Collaterals


Description Version Size
APWorkbench software for audio ICs and MEMS microphones
2,349 KB


Description Version Size
Analog audio solution
1.0 1,371 KB
FFX - Full flexible amplification
4,722 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STA333ISActiveChip Scale Package 0.5mm pitchTape And Reel070_-1.242Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.