STA369BWTR - 2.1-Channel Digital Audio Amplifier | STMicroelectronics
MPN: STA369BWTR ✓ ActiveSTA369BWTR Overview
An audio digital amplifier IC is a power-management and signal-processing device that converts digital audio signals into efficient class-D-style power-stage outputs. The STA369BW belongs to the Sound Terminal family, which combines digital audio processing, amplifier control, and FFX fully flexible amplification technology. This integrated hierarchy places the device between a digital audio source and powered loudspeakers, allowing a complete 2.1-channel audio path to be implemented in a compact design.
Key features include two-channel digital audio processing, high-efficiency digital amplification, I2C and I2S interfaces, and a 36-terminal PowerSSO-36 EPD package. The 22 V power supply supports higher-power loudspeaker output stages, while the 3.3 V supply supports the digital control and signal-processing domain. The reported operating temperature range is -20 °C to 85 °C, making the device suitable for consumer equipment where indoor ambient temperatures are typical.
The FFX architecture allows the amplifier system to combine digital processing with a power output stage in a single-chip solution. Digital audio data is received through the I2S interface, while I2C provides the control path for configuration and operating parameters. This division of functions helps designers build a 2.1-channel amplifier without implementing separate DSP, control, and power-amplifier blocks on the main board.
Typical applications include compact home-audio systems, active speakers, soundbars, multimedia speakers, and other 2.1-channel consumer audio products. The integrated digital control and amplification approach can reduce board area and simplify firmware management. The 36-terminal exposed-pad package still requires careful PCB layout, adequate thermal copper, and verified power-supply decoupling to preserve audio performance.
The primary design consideration is ensuring that the 3.3 V and 22 V supply rails have appropriate voltage tolerance, noise performance, and decoupling. The exposed pad and power-output architecture should be evaluated against the required loudspeaker load and thermal environment before production release. Designers should use the manufacturer datasheet and reference layout for the exact STA369BW variant rather than treating generic audio-amplifier layouts as equivalent.
This product data combines the manufacturer datasheet and product-page identity, distributor availability information, package details, and the supplied cross-reference evidence. It also distinguishes verified STA369BWTR information from specifications that were not present in the supplied source data, avoiding unsupported assumptions about electrical ratings or replacement compatibility.
Drop-in alternatives for STA369BWTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesSTA369BWTR Maximum Ratings & Electrical Characteristics
| Device Type | 2.1-channel high-efficiency digital audio system Sound Terminal |
| Number of Channels | 2 channels |
| Architecture | Digital audio processing, digital amplifier control, and FFX power output stage |
| Digital Audio Interface | I2S |
| Control Interface | I2C |
| Low-Voltage Supply | 3.3 V |
| Power Supply | 22 V |
| Maximum Supply Voltage | 26 V |
| Operating Temperature | -20 °C to 85 °C |
| Package | 36-PowerBFSOP (PowerSSO-36 EPD) |
| Package Width | 7.50 mm |
| Mounting Type | Surface Mount |
| Peak Reflow Temperature | 260 °C |
| Product Status | Active |
STA369BWTR 7.50 mm Pin Configuration Guide
Pin configuration for STA369BWTR (7.50 mm package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for STA369BWTR.
Refer to the datasheet for full pin configuration.
Typical Applications
STA369BWTR is suitable for 6 applications: 2.1-Channel Home Audio System, Active Multimedia Speakers, Compact Soundbar, Digital Audio Hub, Portable Speaker, Consumer Audio Platform.
2.1-Channel Home Audio System
The STA369BWTR fits a compact 2.1-channel home-audio design because it integrates digital audio processing, digital amplifier control, and an FFX power output stage in one IC. I2S accepts digital audio from a source processor, while I2C supports configuration, reducing the need for separate control and processing circuitry. The 3.3 V and 22 V supply domains suit partitioned digital and power sections. Compared with a discrete signal-chain design, the integrated architecture can simplify firmware and PCB partitioning, but the designer must still implement the exact reference layout and verify output power against the selected loudspeaker load.
Recommended
Active Multimedia Speakers
STA369BWTR is suitable for active multimedia speakers requiring a compact digital audio path and 2.1-channel playback. Its I2S input can receive digital audio from a host processor, and I2C provides a separate control connection for configuration and operating commands. Integrating digital processing with the FFX output stage can reduce the number of external functional blocks compared with a discrete amplifier arrangement. The implementation should reserve local decoupling for the 3.3 V domain, robust filtering and routing for the 22 V power domain, and exposed-pad copper adequate for the dissipation required by the enclosure and load.
Recommended
Compact Soundbar
A compact soundbar benefits from the STA369BWTR because its 2.1-channel architecture directly matches systems combining stereo playback with a low-frequency channel. The integrated Sound Terminal function combines digital processing, amplifier control, and power-stage operation, allowing a system controller to send I2S audio and manage settings over I2C. The 36-terminal surface-mount package supports dense board layouts, but the exposed thermal pad and 22 V supply path require deliberate copper and component placement. Before adoption, engineers should confirm amplifier output capability, speaker impedance, thermal performance, and all timing parameters from the production datasheet.
Recommended
Digital Audio Hub
STA369BWTR can serve as the output endpoint of a digital audio hub when the source provides I2S data and accepts I2C configuration. Its integrated processing and FFX output architecture makes it relevant to systems seeking a short digital signal path before loudspeaker drive. This integration can lower component count compared with separate DSP and amplifier stages, particularly in space-constrained consumer products. The design still needs independent verification of I2S format, I2C addresses, control timing, output topology, and thermal limits. Use the exact STMicroelectronics reference circuit and pin definitions because generic digital-amplifier implementations may not match the STA369BW terminal arrangement.
Recommended
Portable Speaker
STA369BWTR can support portable or small-footprint speaker designs where a high-level digital audio input and integrated amplification simplify the signal chain. The 3.3 V logic supply and 22 V power supply allow digital control and output-power sections to remain distinct, while I2S and I2C interfaces support a digital host architecture. Portability does not eliminate thermal constraints: battery and charger systems must provide stable rails, startup behavior must remain controlled, and the exposed pad must dissipate heat effectively. The available evidence does not specify output wattage, efficiency at every load, or battery current, so those values require direct datasheet confirmation.
Recommended
Consumer Audio Platform
The STA369BWTR is relevant to consumer audio platforms that need a dedicated 2.1-channel amplification endpoint with digital control. Integrating the Sound Terminal functions can reduce the number of board-level functional blocks and create a consistent software-controlled path from digital source to loudspeaker output. The I2S input and I2C control interfaces fit modular digital audio designs, while the 36-terminal PowerSSO-36 EPD package supports surface-mount assembly. Integration does not remove qualification work: engineers must validate EMI behavior, thermal rise, speaker-load stability, supply sequencing, and production-test coverage using the manufacturer documentation.
Recommended
Recommended Products Summary
Engineering reference data for STA369BWTR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 36-PowerBFSOP (PowerSSO-36 EPD) |
| Brand | STMicroelectronics |
| Channel Configuration | 2.1-channel |
| Digital Audio Interface | I2S |
| Control Interface | I2C |
| Low-Voltage Supply | 3.3 V |
| Power Supply | 22 V |
| Maximum Supply Voltage | 26 V |
| Operating Temperature | -20 °C to 85 °C |
| Mounting Type | Surface Mount |
Key Differentiators
- Integrated 2.1-channel Sound Terminal architecture (vs Discrete processor and power-amplifier architecture)
- Digital control and audio-data interfaces (vs Analog-input-only amplifier architecture)
- Split low-voltage and power supply domains (vs Single-supply audio amplifier design)
Design Notes
Treat the exposed pad as a mandatory thermal and electrical design element. The supplied evidence identifies a 36-terminal PowerSSO-36 EPD package but does not provide junction-to-ambient resistance or output-power curves. Consequently, the pad area, copper spreading, airflow, and enclosure temperature cannot be finalized from this page. Follow the manufacturer thermal layout and calculate the worst-case dissipation from the actual 22 V rail, load, and amplifier operating mode.
Separate the 3.3 V and 22 V supply paths in the schematic and layout, then place their local decoupling near the corresponding device pins. The supplied data identifies both supply domains but does not specify the required capacitor values or effective capacitance. Use the production datasheet's input, output, and bypass recommendations rather than copying a generic amplifier network. Keep the digital I2S and I2C routing away from high-current switching paths.
Do not infer an alternate amplifier pinout from the 36-pin package count or treat STA369BW as a confirmed drop-in replacement. The verified evidence confirms the STA369BW family identity and the STA369BWTR order code, but it does not publish terminal assignments for every pin or prove that another ordering code uses the identical exposed-pad land pattern. Download the manufacturer datasheet, compare every terminal and electrical limit, and preserve the manufacturer reference layout.
Implement the I2S data and I2C control interfaces as controlled digital nets with short, continuous routing, appropriate return paths, and no unnecessary stubs. The supplied evidence identifies I2S and I2C but does not provide timing, impedance, or isolation guidance. Validate signal integrity at the supported digital interface rate and confirm EMI behavior in the final enclosure using the manufacturer's reference implementation.
Compliance Information
The supplied verified results identify production-data documentation and product availability but do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
