TPA302D - 300mW Stereo Class-AB Amplifier | Texas Instruments
MPN： TPA302D ✓ 啟用中TPA302D 概覽
A Class-AB audio amplifier is a linear power-amplifier category that combines an analog input signal with transistor output stages capable of driving speakers and other finite loads. The TPA302D belongs to the broader hierarchy of audio amplifiers, audio ICs, analog signal-conditioning ICs, and semiconductor devices. Its stereo architecture supports two audio channels while its analog inputs permit direct connection to conventional audio sources.
Key features include shutdown control, internal mid-rail generation, thermal protection, and short-circuit protection. The device is also identified as a functional equivalent of the LM4880 in the supplied technical data. Its 8-pin SOIC package reduces board space and supports automated surface-mount assembly. The verified product information specifically identifies the amplifier as a 300 mW stereo Class-AB device with analog input.
The TPA302 architecture uses separate left and right amplification paths to provide stereo output from analog input signals. The internal mid-rail feature can support single-supply audio architectures, while shutdown control allows the system to place the amplifier in a lower-power state when audio is not required. The datasheet and product listing also indicate compatibility with 5 V and 3.3 V operation, which makes the device relevant to portable equipment, small consumer audio products, and low-voltage embedded systems.
Typical applications include compact stereo speakers, portable audio equipment, auxiliary audio products, USB or docking-system audio paths, and small embedded audio subsystems. The 8-ohm speaker-load target and 250 mW continuous average capability are suitable for low-to-moderate listening levels, although the available output power depends on supply voltage, load impedance, channel balance, thermal conditions, and signal level.
Designers should verify the SOIC footprint, supply decoupling, output-filter requirements, speaker wiring, thermal rise, and shutdown polarity against the manufacturer datasheet before layout release. The device is not a Class-D switching amplifier, so its output-stage dissipation and analog signal integrity should be checked carefully in continuous-use designs.
直接替換替代品，適用於 TPA302D — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TPA302D （相同外形與佔位） — 差異在於 Package, Product Type, Short-Circuit Protection, Thermal Protection.
TPA302DR
✅ 直接替換聯絡詢價
查看資料表 →TPA302DG4
✅ 直接替換📋 參考替代品（不在目錄中）
TPA152D
✅ 直接替換📋 參考替代品（不在目錄中）
TPA112DGN
✅ 直接替換📋 參考替代品（不在目錄中）
TPA302D 最大額定值與電氣特性
| Product Type | Stereo analog-input audio power amplifier |
| Amplifier Class | Class-AB |
| Number of Channels | 2 channels |
| Rated Output Power | 300 mW |
| Continuous Average Output Power | 250 mW per channel into 8 ohm |
| Low-Power Output Specification | 60 mW at less than 0.06% THD+N |
| Supply Compatibility | 5 V and 3.3 V specified operation |
| Input Type | Analog input |
| Shutdown Control | Yes |
| Mid-Rail Generation | Internal |
| Thermal Protection | Internal |
| Short-Circuit Protection | Internal |
| 封裝 | 8-pin SOIC (D) |
| 安裝類型 | Surface mount |
| Functional Reference | LM4880 functional equivalent |
| DigiKey Classification | 2-channel stereo Class-AB amplifier IC |
| Manufacturer Product Page | TPA302 family |
TPA302D 8-pin soic (d) 腳位配置指南
TPA302D（8-pin soic (d) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： TPA302D.
請參閱 資料表 以查看完整腳位配置。
典型應用
TPA302D 適用於 6 應用s: Compact Stereo Speaker, Portable Audio Product, USB or Docking Audio, Low-Power Embedded Audio, Auxiliary Audio Accessory, Small Portable Speaker.
Compact Stereo Speaker
The TPA302D fits compact stereo speakers because the verified device is a 300 mW, two-channel Class-AB amplifier with 250 mW continuous average output per channel into an 8-ohm load. Place the amplifier after the stereo analog source and drive the left and right speaker channels through the manufacturer-recommended output network. The 8-pin SOIC package helps reduce board area, while shutdown control can turn the amplifier off when the enclosure is inactive. Verify output filtering, speaker impedance, thermal rise, and maximum channel imbalance before production.
推薦
Portable Audio Product
TPA302D is relevant to portable audio products because the verified information specifies 3.3 V and 5 V operation, shutdown control, and low-power Class-AB output. The internal mid-rail function supports a compact single-supply signal path, which can simplify system partitioning around a codec or digital audio source. A design should still budget output-current capability, battery transient response, speaker efficiency, and heat dissipation. Shutdown can reduce consumption when playback is stopped, but the exact control voltage and timing must be taken from the datasheet.
推薦
USB or Docking Audio
The TPA302D can serve as the analog output stage in a docking speaker or USB-audio accessory when the upstream device provides left and right analog signals. Its two-channel architecture matches common stereo source formats, and the 8-pin SOIC package supports compact auxiliary boards. The verified 250 mW per-channel 8-ohm rating is appropriate for near-field listening at modest levels, not for high-volume consumer speakers. Add input filtering and decoupling close to the amplifier, and verify ground return paths to prevent channel crosstalk or audible noise.
推薦
Low-Power Embedded Audio
TPA302D is suitable for small embedded audio subsystems that need local speaker drive without a high-power switching amplifier. The specified 3.3 V compatibility, shutdown function, internal mid-rail generation, and internal protection features make it practical for embedded control products with intermittent audio use. System designers should confirm the amplifier’s supply-current behavior, startup timing, speaker startup transients, and thermal behavior. The device is an analog Class-AB amplifier, so the source and power rails must be quiet enough for the intended audio quality.
推薦
Auxiliary Audio Accessory
The TPA302D can be used in a small auxiliary audio accessory that accepts analog stereo input and drives two 8-ohm speakers. The verified product classification explicitly identifies a 2-channel stereo Class-AB amplifier in an 8-pin SOIC package. This arrangement is useful for desktop audio, educational kits, and simple control-panel speakers where the enclosure limits heat dissipation. Keep the analog input path short, provide the manufacturer-required bypass capacitors, and test both channels at the intended supply voltage. Use the verified 8-ohm rating as the design reference.
推薦
Small Portable Speaker
TPA302D is a practical choice for small portable speakers requiring more drive than a headphone output but not the power of a Class-D booster. Its 250 mW continuous average rating into 8 ohms and 60 mW low-distortion operating point support compact stereo products. The Class-AB topology avoids the switching characteristics of Class-D amplification but can dissipate more power from a DC supply, so battery and thermal design should be evaluated carefully. Confirm speaker sensitivity and enclosure limits before selecting this amplifier for a target maximum SPL.
推薦
推薦產品摘要
工程參考資料，適用於 TPA302D — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPA302DR | TPA302DG4 | TPA152D | TPA112DGN |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
主要差異化特點
- Documented stereo output rating (對比TPA302D vs TPA112DGN)
- Specified low-voltage operation (對比TPA302D vs TPA302DR)
- Integrated fault protection (對比TPA302D vs TPA152D)
設計說明
The verified TPA302D rating is 250 mW continuous average power per channel into an 8-ohm load, while the family description identifies a 300 mW stereo output rating. Check the supply voltage, speaker impedance, channel loading, and thermal conditions against the datasheet before selecting the device. Place the required bypass capacitors close to the supply pins and route high-current output returns with low impedance.
Because the TPA302D is a Class-AB power amplifier in an 8-pin SOIC package, continuous stereo operation can generate heat in the output stages. Estimate power dissipation from the actual supply voltage, output voltage, and load current rather than relying only on the headline 300 mW rating. Use the manufacturer thermal information and provide adequate PCB copper, while leaving no assumption that internal thermal protection eliminates the need for thermal validation.
Keep analog input traces short and away from speaker-output and switching-node traces. Confirm the exact pin assignments from the official TPA302 datasheet before routing because the supplied data confirms the 8-pin SOIC package but does not include a verified pin table. Use a stable analog ground strategy, minimize return-loop area, and place input and supply bypass components close to their associated pins.
Do not treat the functional LM4880 equivalence as proof of a drop-in replacement. Functional equivalence can describe the intended audio role without guaranteeing identical pin mapping, supply limits, shutdown polarity, biasing, output topology, or thermal behavior. Verify the manufacturer datasheets and, when necessary, prototype the alternate part before redesigning an existing board.
合規資訊
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These values remain unknown rather than being inferred from the manufacturer or package.
