TPA302DR - 300mW Stereo Class-AB Amplifier | Texas Instruments
料号： TPA302DR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TPA302DR 概述
A Class-AB audio amplifier is an analog signal-processing integrated circuit that uses push-pull transistor output stages to drive speakers or other low-impedance loads. The TPA302DR belongs to the broader audio-amplifier hierarchy, which includes stereo amplifiers, linear amplifiers, and semiconductor power amplifiers. Its Class-AB architecture provides continuous bipolar output rather than the pulsed output associated with Class-D designs, making it suitable for low-power portable, personal-audio, and auxiliary audio products.
Key features include 300 mW stereo output capability, 1.5 MHz bandwidth, operation from 5 V and 3.3 V rails, internally generated mid-rail voltage, shutdown control, and thermal and short-circuit protection. The 8-pin SOIC package reduces board area and supports automated surface-mount assembly. These characteristics make the device useful where two analog audio channels must drive headphones or small speakers without the complexity of a switching amplifier and external mid-rail circuitry.
The amplifier accepts analog left- and right-channel inputs and uses external gain-setting resistors to establish channel gain. According to the Texas Instruments TPA302 data sheet, the device is specified for operation from a 5 V supply and is also compatible with 3.3 V operation. Its internally generated mid-rail provides a convenient common return for single-supply audio signals, while the shutdown function can reduce supply consumption when the audio path is not active.
Typical applications include portable speakers, headphone and headset drivers, personal-audio accessories, small consumer-audio systems, and compact embedded audio products. The 250 mW-per-channel capability into 8 ohms is appropriate for low-impedance transducers rather than high-power loudspeaker systems. System designers should confirm speaker impedance, amplifier gain, input coupling, output configuration, and power-supply headroom before finalizing the analog and layout design.
A key design consideration is the distinction between the 300 mW headline output rating and the verified application condition of 250 mW per channel into 8 ohms. Allow for copper, nearby heat sources, enclosure temperature, and supply tolerance, and use the datasheet thermal information to assess reliable operation. This page synthesizes verified manufacturer and distributor information, engineering design notes, comparison data, and drop-in replacement guidance beyond the basic distributor listing.
直接替换替代料： TPA302DR ——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： TPA302DR （相同外形与封装尺寸） ——差异在于 Package, Product Type, Short-Circuit Protection, Thermal Protection.
快速对比工具——选择替代料号进行并排对比：
TPA6111A2D
✅ 直接替换📋 参考替代料（不在目录中）
TPA302DR 最大额定值与电气特性
| Product Type | Stereo analog-input Class-AB audio power amplifier |
| Maximum Stereo Output Power | 300 mW |
| Continuous Output Power Into 8-Ohm Load | 250 mW per channel |
| Output Power at Less Than 0.06% THD+N | 60 mW |
| Amplifier Type | Class AB |
| Number of Output Channels | 2 channels |
| Bandwidth | 1.5 MHz |
| Maximum Supply Voltage | 5.5 V |
| Specified Supply Operation | 5 V and 3.3 V |
| Mid-Rail Generation | Internal |
| Shutdown Control | Yes |
| Thermal Protection | Yes |
| Short-Circuit Protection | Yes |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
TPA302DR 引脚配置
| 引脚 1 | NC — Not connected (per datasheet) |
| 引脚 2 | GND — Ground |
| 引脚 3 | IN- — Inverting input for the left channel |
| 引脚 4 | IN+ — Non-inverting input for the left channel |
| 引脚 5 | SHUTDOWN — Shutdown control input |
| 引脚 6 | MIDRAIL — Internal mid-rail bypass or output connection |
| 引脚 7 | OUT+ — Positive left-channel output |
| 引脚 8 | OUT- — Negative left-channel output |
典型应用
TPA302DR 适用于 6 应用s: Portable Bluetooth Speakers, Headset and Headphone Drivers, USB-C and Desktop Audio Accessories, Consumer Audio Auxiliary Amplifier, Portable Personal Audio Systems, Embedded Control and Sensor Audio.
Portable Bluetooth Speakers
The TPA302DR fits compact Bluetooth and portable-audio products because it delivers 250 mW of continuous average power per channel into 8 ohms and supports operation from 3.3 V or 5 V supplies. Its Class-AB output avoids the switching node of a Class-D device, which can simplify analog filtering around compact speakers. The 8-pin SOIC package also conserves board area. A practical design still needs input coupling capacitors, externally configured gain resistors, output protection appropriate to the speaker wiring, and thermal verification. Designers should confirm that the selected speaker impedance remains above the supported load and that the enclosure does not trap enough heat to raise the device temperature beyond its rated condition.
推荐
Headset and Headphone Drivers
The TPA302DR can provide a compact analog-output stage for stereo headsets, headphone amplifiers, and personal-audio accessories. Its two-channel Class-AB architecture supports left and right drive from one 8-pin SOIC device, while the 300 mW headline capability is appropriate for many low-impedance earphone or small-headphone loads. The verified 250 mW per-channel specification applies to an 8-ohm load, so it must not be interpreted as guaranteed output into every headphone impedance. Headset designs should verify voltage drop across series resistors, DC offset at startup, connector pinout, and whether the chosen output network requires DC blocking. The shutdown pin supports controlled power management when the audio source is inactive.
推荐
USB-C and Desktop Audio Accessories
The TPA302DR is suited to USB-C speakers, desktop audio accessories, and compact monitor products that need two analog audio output channels. A 5 V supply is within the device's specified operating conditions, and 8-pin SOIC packaging simplifies automated assembly in small enclosures. The amplifier's 1.5 MHz bandwidth covers the audible band with additional headroom, while its 60 mW output capability at less than 0.06% THD+N provides a defined low-level performance point. In a USB accessory, analog input conditioning, USB-to-audio conversion, and output coupling remain separate design tasks. The system integrator must also assess ground noise, speaker impedance, plug-in protection, and the heat generated when both channels drive continuously.
推荐
Consumer Audio Auxiliary Amplifier
The TPA302DR works as the output stage in auxiliary audio products, educational displays, and low-power consumer-audio systems requiring stereo amplification. Its internally generated mid-rail simplifies single-supply analog signal handling, and external input resistors allow the designer to establish channel gain. The 300 mW stereo output rating is adequate for small enclosed speakers but not for conventional high-power audio amplification. A robust implementation should include input series resistance or filtering, output coupling appropriate to the load, supply decoupling near the device, and protection against accidental speaker shorts. The verified thermal and short-circuit protection features improve robustness, although they do not remove the need for sound mechanical and electrical design.
推荐
Portable Personal Audio Systems
The TPA302DR is appropriate for compact personal-audio systems where battery-derived 3.3 V or regulated 5 V power is available and two low-power speakers must be driven. It combines a 2-channel Class-AB output stage, shutdown control, and internal mid-rail generation in one 8-pin SOIC package. Operation from 3.3 V can simplify portable power architecture, while shutdown allows the amplifier to be disabled when the source is inactive. The design must still account for battery droop, startup transients, speaker sensitivity, and the current needed at the selected output level. Because continuous output into 8 ohms is specified at 250 mW per channel, a system requiring greater excursion should select a higher-power amplifier rather than operate beyond the verified load condition.
推荐
Embedded Control and Sensor Audio
The TPA302DR can add audible feedback or low-level voice monitoring to embedded control panels, robotics modules, and compact sensor terminals. Two channels permit separate speaker and alert paths when required, and the 300 mW output class is well matched to small transducers. Because the device accepts analog input, the signal chain must originate from a verified audio source rather than a raw digital bus. Designers should keep the analog path short, provide stable reference and supply connections, and place input and supply bypass capacitors near the relevant pins. The 8-pin SOIC format also supports automated production assembly. Before deployment, verify that startup noise, thermal rise, and audible distortion remain acceptable in the final enclosure and under the expected battery or supply tolerance.
推荐
推荐产品汇总
工程参考数据： TPA302DR ——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 | TPA6111A2D |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC |
| Product Type | Stereo analog-input Class-AB audio amplifier | Stereo audio amplifier |
关键差异点
- Defined low-power stereo performance （对比 TPA6111A2D)
- Low-voltage portable-system support （对比 TPA6111A2D)
- Integrated power-management features （对比 TPA6111A2D)
设计说明
Place input, supply, and output-support components close to their associated device pins, especially the supply bypass network. Keep the two stereo channels balanced in routing where practical so that analog pickup and channel gain differences remain small. The internal mid-rail connection must follow the manufacturer's recommended bypass arrangement exactly; adding an arbitrary external mid-rail load can alter biasing and output behavior.
Design the supply for the selected output condition rather than only for quiescent current. The TPA302DR is specified for 5 V and 3.3 V operation, with a 5.5 V maximum supply, so include regulator tolerance and transient headroom. Use local decoupling and verify startup current, shutdown behavior, and the voltage delivered to the amplifier while both channels drive the intended load.
Estimate dissipation from the actual supply voltage, output voltage, and load current: Estimated P = (VIN - VOUT) x IOUT for a linear Class-AB output stage. Compare that result with the package thermal information from the manufacturer data sheet, allow for ambient temperature and nearby heat sources, and use copper area or other cooling measures when the calculated loss is material. The 300 mW output rating alone does not establish junction-temperature margin.
Do not treat the 300 mW product headline as an unconditional rating for every speaker impedance and distortion level. The verified condition includes 250 mW continuous average output per channel into 8 ohms, and the data sheet also specifies 60 mW at less than 0.06% THD+N. Confirm gain resistors, input coupling, output network, load impedance, and maximum signal level before release, and protect externally connected speaker leads against shorts.
合规信息
The supplied verified results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not_applicable because no automotive qualification is identified for this commercial audio-amplifier application.