TPA311DG4 - 350mW Mono Class AB Amplifier | Texas Instruments
料号： TPA311DG4 ✓ 量产中TPA311DG4 概述
An audio power amplifier is an integrated circuit that increases the voltage and current capability of an audio signal so it can drive a speaker or another defined load. In the broader hierarchy, the TPA311DG4 is a mono Class AB audio amplifier, an amplifier IC, an integrated circuit, and a discrete signal-processing component for low-voltage audio equipment. Its BTL architecture allows an internal speaker to be driven without a speaker-blocking capacitor, while SE mode supports external earphone operation.
The device is specified for 3.3 V and 5 V operation, with a maximum supply voltage of 5.5 V. Its 350 mW output-power description makes it suitable for compact internal speakers and low-power audio paths. A distributor listing also reports 0.7 W nominal output power, but the manufacturer-linked search description identifies the TPA311DG4 specifically as a 350 mW mono audio power amplifier. System designers should therefore confirm the exact test conditions and load used in the manufacturer datasheet before sizing the speaker and supply.
The TPA311 family combines a fully specified low-voltage operating range with BTL-to-SE mode control, integrated depop circuitry, and built-in thermal and short-circuit protection. These features make the amplifier appropriate for products using either 3.3 V or 5 V system rails. The 8-pin SOIC package also supports automated assembly and compact board layouts, although adequate copper and thermal layout remain necessary when continuous audio output causes appreciable internal dissipation.
Typical applications include portable speaker systems, compact consumer audio products, and low-voltage equipment requiring an internal mono speaker plus an external headphone path. The part can also serve as the power stage in a larger audio subsystem when the design only requires a small speaker output. Its protection functions reduce system risk during abnormal load conditions, but they do not replace correct speaker impedance selection, supply decoupling, or thermal design.
A key design consideration is the difference between BTL and SE mode. In BTL mode, the amplifier drives the speaker differentially and does not require an output coupling capacitor. In SE mode, one output is referenced differently to support an earphone load. Designers should follow the manufacturer configuration, component values, and decoupling guidance rather than assuming that the two modes have identical load, output-power, or stability requirements.
This product page consolidates the verified manufacturer and distributor descriptions for the TPA311DG4, identifies the available pin-compatible family comparisons, and adds application guidance that is not presented as a substitute for the official electrical characteristics, absolute maximum ratings, and test-condition tables in the manufacturer datasheet.
直接替换替代料： TPA311DG4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TPA311DG4 （相同外形与封装尺寸） ——差异在于 Output Configuration.
TPA311DR
✅ 直接替换联系询价
查看数据手册 →TPA311DRG4
✅ 直接替换📋 参考替代料（不在目录中）
TPA311DG4 最大额定值与电气特性
| Manufacturer-Described Output Power | 350 mW |
| Distributor-Reported Nominal Output Power | 0.7 W |
| Output Channel Count | 1 channel (mono) |
| Amplifier Type | Class AB |
| Specified Supply Operation | 3.3 V and 5 V |
| Maximum Supply Voltage | 5.5 V |
| 输出配置 | BTL or single-ended (SE) |
| Depop Circuitry | Integrated |
| Thermal Protection | Integrated |
| Short-Circuit Protection | Integrated |
| 封装 | 8-pin SOIC |
| Terminal Count | 8 terminals |
| 安装类型 | Surface mount |
| Temperature Grade | Industrial |
| Terminal Form | Gull wing |
| Package Shape | Rectangular |
| Distributor-Reported Nominal Bandwidth | 10 kHz |
| Distributor-Reported Package Code | SOP |
TPA311DG4 sop 引脚配置指南
TPA311DG4（sop 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： TPA311DG4.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPA311DG4 适用于 6 应用s: Portable Mono Speaker, Low-Voltage Consumer Audio, Earphone and Headphone Output, Industrial Control Annunciator, IoT Sensor Node with Audio, Compact Audio Test Module.
Portable Mono Speaker
The TPA311DG4 fits a compact portable speaker because it is a 1-channel Class AB amplifier specified for 3.3 V and 5 V rails. Its manufacturer-described 350 mW output provides useful drive for a small internal transducer without requiring a high-voltage audio amplifier. In a bridge-tied-load configuration, the speaker connects differentially and can operate without a series output capacitor, helping reduce component count. The design should select a speaker compatible with the verified output-power and load conditions, while accounting for the amplifier's heat dissipation at continuous high output.
推荐
Low-Voltage Consumer Audio
The TPA311DG4 is suitable for compact consumer-audio products built around a 3.3 V or 5 V system rail. Its mono Class AB architecture supplies enough output for an internal speaker, while integrated thermal and short-circuit protection add basic robustness. Unlike a higher-power class-D solution, the Class AB stage offers a straightforward path for low-to-moderate output levels. Designers should place input, supply, and output components according to the manufacturer layout and use stable filtering appropriate to the selected gain and mode configuration.
推荐
Earphone and Headphone Output
The TPA311DG4 can support external earphone operation through its single-ended mode while also serving an internal speaker in bridge-tied-load mode. This dual-mode capability is useful in portable equipment where one audio path must transition between a higher-voltage internal transducer and a sensitive external headset. The SE output should be connected according to the manufacturer diagram, including any required output network and mode-control arrangement. Verify maximum earphone current and ensure the mode-control timing does not create audible switching transients.
推荐
Industrial Control Annunciator
The TPA311DG4 can drive a small speaker in an industrial control or monitoring enclosure where a low-voltage alert tone is required. Its specified 3.3 V and 5 V operation suits embedded control boards, and its thermal and short-circuit protections help contain fault conditions associated with misconnected or failing speakers. The industrial temperature-grade listing makes it more relevant to controlled industrial environments than a consumer-only device. The enclosure should limit acoustic output to safe levels, and the PCB should provide adequate copper around the SOIC for thermal performance.
推荐
IoT Sensor Node with Audio
An IoT sensor node that includes voice feedback or a local notification speaker can use the TPA311DG4 when its available rail is 3.3 V or 5 V. The part provides a compact mono output stage without requiring a large class-D modulator and external output filter in many low-power designs. Its integrated depop circuitry can help suppress startup or mode-change transients, while thermal and short-circuit protection improve resilience in unattended equipment. The overall power budget should include continuous amplifier dissipation, speaker efficiency, and any simultaneous radio or sensor load.
推荐
Compact Audio Test Module
The TPA311DG4 can serve as a compact amplifier element in a low-voltage audio test or evaluation module. Because it supports 3.3 V and 5 V operation, engineers can characterize speaker loading, BTL-to-SE behavior, and output behavior using common laboratory rails. Its small 8-pin SOIC package simplifies breakout-board construction and automated probing. For repeatable measurements, use the manufacturer-defined test conditions and account for the 350 mW versus 0.7 W output descriptions in the supplied listings, which may reflect different load or test assumptions.
推荐
推荐产品汇总
工程参考数据： TPA311DG4 ——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 | TPA311DR | TPA311DRG4 |
|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Channel Count | 1 channel (mono) | 1 channel (mono) | 1 channel (mono) |
| Amplifier Class | Class AB | Class AB | Class AB |
| Output Modes | BTL and single-ended (SE) | BTL and single-ended (SE) | BTL and single-ended (SE) |
关键差异点
- Higher manufacturer-described output power （对比 TPA311DR)
- Explicit low-voltage compatibility （对比 TPA311DR)
- Integrated fault and transient-control features （对比 TPA311DRG4)
设计说明
Route the TPA311DG4 supply, input, and output connections according to the manufacturer application diagram, placing the required bypass components close to their associated pins. In BTL mode, treat both speaker outputs as active signals and keep copper routes compact to minimize differential pickup and electromagnetic coupling. The verified excerpts confirm the SOIC package and protection functions but do not specify capacitor values or layout dimensions, so use the official datasheet values rather than substituting generic values.
Estimated: Class AB output-stage dissipation depends on the selected output power, load, supply voltage, and operating mode. With a 5 V rail, a 5 V output, and 350 mW of delivered power, the output-stage voltage-and-current product is 0.35 W before accounting for bias and efficiency losses. Use this estimate for early thermal planning, then validate the actual junction temperature using the manufacturer dissipation data and the PCB thermal model.
Do not treat the 350 mW manufacturer description and the 0.7 W distributor value as interchangeable specifications. The supplied evidence does not identify the speaker impedance, distortion limit, or supply condition associated with the 0.7 W claim. Likewise, do not assume that BTL and SE modes have identical output power or load behavior. Select the mode, speaker impedance, gain, and output-network values from the relevant manufacturer test conditions before releasing the design.
The integrated depop, thermal, and short-circuit protections improve robustness but do not eliminate layout risk. Keep sensitive audio inputs away from output and switching nodes, maintain short ground returns, and use a stable common reference between source circuitry and the amplifier. When switching between BTL and SE operation, verify that control sequencing and external components meet the manufacturer's guidance to avoid audible transients or excessive direct-current conditions.
合规信息
The verified excerpts identify an industrial temperature grade but do not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable because the part is not identified as an automotive-qualified device.