STA350B - 2.1-Channel Digital Audio Power Stage | STMicroelectronics
料号： STA350B ✓ 量产中STA350B 概述
A Sound Terminal is an integrated audio subsystem rather than a conventional standalone power amplifier. Its functional hierarchy is digital audio processor, then digital amplifier controller, then FFX class-D power-output stage. Integrating these blocks allows a system designer to reduce the number of external amplifiers while retaining digital volume control, bass management, and channel-routing functions. The STA350B supports a two-channel digital-audio configuration with additional low-frequency capability for 2.1 systems.
Key features include a 2.1-channel architecture, digital audio processing, an integrated digital amplifier controller, and the FFX high-efficiency output stage. The manufacturer datasheet presents its performance specifications at VCC = 24 V, f = 1 kHz, switching frequency fsw = 384 kHz, ambient temperature of 25 °C, and an 8 Ω load. These conditions are important when comparing amplifier output data because power, distortion, and efficiency can change with supply voltage, load impedance, and switching frequency.
The STA350B accepts digital audio through I2S and is configured through I2C, making it appropriate for systems whose volume, routing, or sound-field processing is handled by a host controller or digital audio source. The integrated approach shortens the signal path between digital processing and power amplification while reducing external component count compared with a processor-plus-discrete-amplifier architecture.
Typical applications include compact 2.1-channel speaker systems, soundbars, compact home-theater speakers, multimedia speaker platforms, and digital active-speaker products. The STA350B is particularly relevant where a small enclosure, efficient power conversion, and controlled digital audio behavior are more important than a conventional analog-input amplifier architecture.
For PCB design, treat the exposed pad as both the electrical ground reference and a principal thermal path. Follow the manufacturer land-pattern, power-routing, decoupling, and thermal-pad guidance in the datasheet rather than relying only on the generic PowerSSO-36 outline. Verify amplifier stability, thermal rise, and acoustic performance in the finished enclosure.
This page combines manufacturer identification, interface and package information, operating-condition references, application engineering guidance, and verified sourcing links. It also documents the absence of a confirmed pin-compatible substitute list rather than presenting unverified cross-brand parts as drop-in replacements.
直接替换替代料： STA350B ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料STA350B 最大额定值与电气特性
| Product Type | 2.1-channel high-efficiency digital audio system |
| Audio Channel Count | 2 channels plus subwoofer channel |
| Supply Voltage Test Condition | 24 V |
| Test Frequency | 1 kHz |
| 开关频率 | 384 kHz |
| Reference Ambient Temperature | 25 °C |
| Reference Load Impedance | 8 Ω |
| Digital Audio Interface | I2S |
| Control Interface | I2C |
| Power Stage Technology | FFX high-efficiency digital power-output stage |
| Integrated Functions | Digital audio processing, digital amplifier control, and power-output stage |
| 封装 | PowerSSO-36 with exposed pad up |
| Package Pin Count | 36 pins |
| 安装类型 | Surface-mount technology (SMT) |
| Shipping Format | Tray |
STA350B 36 pins 引脚配置指南
STA350B（36 pins 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： STA350B.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STA350B 适用于 6 应用s: Compact 2.1-Channel Multimedia Speaker, Digital Soundbar Speaker Module, Home-Theater Active Speaker, Digital Active Bookshelf Speaker, Industrial Audio Control Terminal, Portable Battery-Powered Speaker.
Compact 2.1-Channel Multimedia Speaker
The STA350B fits a compact multimedia speaker because it combines two-channel digital amplification and subwoofer support with I2S audio input in a single PowerSSO-36 device. Its integrated digital processing and FFX high-efficiency output stage can reduce the number of separate amplifier blocks in the enclosure. The design should still be validated at the intended load and supply, because the verified datasheet conditions specify 24 V, 384 kHz switching frequency, and an 8 Ω load. I2C control allows the source device to manage volume or configuration without a separate analog control path.
推荐
Digital Soundbar Speaker Module
The STA350B is applicable to a soundbar speaker module where a compact digital audio path is preferred over separate analog amplification. I2S accepts the decoded audio stream, while I2C permits the host processor to adjust configuration and operating states. The integrated 2.1-channel architecture supports a main-channel and subwoofer arrangement within a constrained enclosure. Thermal performance depends on copper area, the exposed-pad layout, sustained output power, and ambient temperature, so the final acoustic enclosure must be tested rather than relying on package data alone.
推荐
Home-Theater Active Speaker
An active home-theater speaker can use the STA350B to place digital volume and channel control close to the power stage. The I2S input avoids long analog interconnects between a source and the amplifier, which can help preserve signal integrity inside a multiway speaker. The 2.1-channel capability supports compact left, right, and subwoofer implementations. Designers must verify that the host supplies compatible I2S clocking and that the I2C control sequence satisfies the device requirements before schematic sign-off.
推荐
Digital Active Bookshelf Speaker
The STA350B suits a digital active bookshelf speaker built around a host controller or network audio receiver. Digital input and control reduce the need for analog preamplifier stages, while the integrated processing and amplifier-control blocks can shorten the design cycle. In a passive-looking enclosure, the device still needs a correctly designed power-supply path, output filtering, thermal spreading structure, and stable grounding. Because the retrieved data does not provide a complete electrical output-power table, the available power must be confirmed from the manufacturer datasheet for the selected load.
推荐
Industrial Audio Control Terminal
The STA350B can support an industrial audio terminal when the system needs digital volume control, deterministic configuration, and efficient amplification in a restricted enclosure. The I2C interface allows supervisory electronics to manage mute, configuration, or system behavior, while I2S carries the audio samples. The verified sources do not confirm AEC-Q100 qualification or an industrial temperature grade, so a regulated deployment must check those ratings explicitly. Remote or fanless designs should also evaluate acoustic limits and thermal rise under worst-case playback conditions.
推荐
Portable Battery-Powered Speaker
The STA350B may fit a portable speaker when its system architecture can supply the required power rail and manage heat near the battery. Its high-efficiency digital output architecture is relevant where amplifier efficiency affects usable playback time, although the supplied data does not quantify battery-current savings or efficiency at a specific output level. The 24 V reference condition also means it is not inherently a low-voltage battery part. Designers should compare total conversion loss, including power-supply efficiency, against a regulator-based low-voltage alternative.
推荐
推荐产品汇总
工程参考数据： STA350B ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Product Type | 2.1-channel high-efficiency digital audio system |
| Brand | STMicroelectronics |
| Package | PowerSSO-36 with exposed pad up |
| Digital Audio Interface | I2S |
| Control Interface | I2C |
| Reference Supply Voltage | 24 V |
| Reference Load Impedance | 8 Ω |
| Reference Switching Frequency | 384 kHz |
| Reference Test Frequency | 1 kHz |
| Reference Ambient Temperature | 25 °C |
| Shipping Format | Tray |
关键差异点
- Integrated digital audio processing and power conversion （对比 STA350BW)
- Native digital control and audio interface （对比 Conventional analog power amplifier)
- Purpose-built 2.1-channel subsystem （对比 Discrete amplifier architecture)
设计说明
The STA350B uses an exposed pad on the top side of the PowerSSO-36 package. Treat that pad as the primary thermal and electrical-ground path, and follow the manufacturer's land-pattern and via recommendations exactly. Estimated: because no verified thermal-resistance figure, output-power table, or ambient limit was supplied, junction temperature cannot be calculated responsibly. Validate the assembled amplifier at the intended 24 V condition and sustained output level in its final enclosure.
Separate the digital audio and control paths from the high-current switching outputs on the PCB. Keep I2S and I2C traces short, route them over a continuous ground reference, and place support components close to their associated pins. The verified data does not provide the manufacturer's complete reference layout or component values, so use the official datasheet and evaluation guidance for decoupling, output filters, and power-supply connections instead of copying generic values.
Do not treat STA350BW as a drop-in alternative for STA350B merely because both are Sound Terminal devices. The verified datasheet describes STA350B with the exposed pad or slug up and STA350BW with the exposed pad down, changing the assembly and thermal-layout implications. Also avoid comparing amplifier headline specifications without matching VCC = 24 V, fsw = 384 kHz, RL = 8 Ω, f = 1 kHz, and Tamb = 25 °C conditions.
合规信息
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The STMicroelectronics product page identifies the STA350B as an active product, but lifecycle observation must not be treated as proof of a specific regulatory qualification.
