TPA311D - 350mW Mono Class-AB Amplifier | Texas Instruments
N.º de pieza: TPA311D ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
TPA311D Descripción general
A Class-AB audio amplifier is a linear audio amplifier whose output devices conduct for part of the signal cycle. In the audio-power hierarchy, it provides a relatively linear output with less switching-related EMI than many Class-D solutions, making it useful in compact voice, portable-device, and low-voltage speaker systems. The TPA311 family also supports bridge-tied-load and single-ended operating modes, allowing the device to serve internal-speaker and earphone paths with appropriate output configuration.
The verified data identifies the TPA311 as a 350 mW mono audio power amplifier and highlights operation at 3.3 V and 5 V, wide power-supply compatibility, bridge-tied-load to single-ended mode control, integrated depop circuitry, and thermal and short-circuit protection. The manufacturer product page describes 250 mW continuous power into a bridge-tied 8-ohm load at less than 1% THD+N throughout voice-band frequencies when operated from a 3.3 V supply. These figures describe the TPA311 family context associated with TPA311D.
The architecture is suitable for compact audio equipment where a low-voltage supply limits available output power. The integrated protection features help manage thermal and short-circuit conditions, while depop circuitry helps control output transients during startup or mode changes. Engineers should still validate speaker impedance, supply headroom, thermal dissipation, and the selected output topology against the manufacturer datasheet before releasing a production PCB.
Typical uses include portable audio products, voice-enabled devices, small speaker systems, headphone or earphone interfaces, and embedded audio subsystems. The 8-SOIC package simplifies assembly for designs using conventional surface-mount production processes. Because the target is a legacy audio amplifier family, availability, lifecycle status, pricing, and exact electrical limits should be reconfirmed from current manufacturer and distributor data.
A key design consideration is the difference between the family headline rating of 350 mW and the verified 3.3 V application condition of 250 mW into an 8-ohm BTL load at less than 1% THD+N. The circuit must be designed around the actual supply, load, package thermal behavior, and output mode rather than treating the headline power as an unconditional speaker rating. This page combines verified source data with structured engineering guidance and clearly identifies unavailable parameters.
Alternativas directas para TPA311D — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con TPA311D (mismo factor de forma y huella) — difiere en Output Topology, Protection Features.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TPA311DR
✅ Sustitución directa✓ En stock
$0.37 / unidad
Ver hoja de datos →TPA311D Valores máximos y características eléctricas
| Product Type | Mono Class-AB audio power amplifier |
| Rated Output Power | 350 mW |
| 3.3 V Continuous BTL Power into 8 ohm | 250 mW at less than 1% THD+N throughout voice-band frequencies |
| Channel Count | 1 channel |
| Supply Voltage Operation | 3.3 V and 5 V |
| Output Topology | Bridge-tied load (BTL) or single-ended (SE) |
| Protection Features | Integrated thermal and short-circuit protection |
| Output Transient Control | Integrated depop circuitry |
| Encapsulado | 8-pin SOIC |
| Tipo de montaje | Surface mount |
| THD+N at 3.3 V and 250 mW | Less than 1% throughout voice-band frequencies |
| Recommended Speaker Load | 8 ohm |
| Typical Target | Internal speaker and external earphone operation |
| Switching Mode | Bridge-tied load to single-ended switching mode |
| Manufacturer | Texas Instruments |
| Supplier Listing | DigiKey product listing |
Guía de configuración de pines de TPA311D 8-pin soic
Configuración de pines para TPA311D (encapsulado 8-pin soic). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para TPA311D.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
TPA311D es adecuado para 6 aplicacións: Portable Voice Speaker, 3.3 V Embedded Audio Module, Headphone and Earphone Output, Small Consumer Audio Product, Industrial Audible Alarm, USB or Battery-Powered Audio Accessory.
Portable Voice Speaker
The TPA311D fits a compact portable voice-speaker path because the verified TI information describes 250 mW continuous output into a bridge-tied 8-ohm load at less than 1% THD+N from a 3.3 V supply. Place the amplifier between the audio source and speaker, using the documented BTL configuration and local supply decoupling. The 8-SOIC package is practical for a mixed-signal PCB, while thermal validation remains necessary because linear amplification converts part of the supplied power into heat. The design should be checked at the highest expected volume, speaker impedance, and supply tolerance before production.
Recomendado
3.3 V Embedded Audio Module
TPA311D is suitable for embedded audio modules operating from a 3.3 V rail when the required acoustic output is modest. Its verified Class-AB architecture, BTL or single-ended support, integrated depop circuitry, and short-circuit protection provide a practical foundation for speech playback, status audio, and compact speaker interfaces. The amplifier should be configured according to the exact datasheet pinout, with input and output return paths kept controlled. Compared with a higher-power Class-D design, the part avoids introducing a large switching output stage for this low-power use case, although efficiency and heat must be evaluated against the final load.
Recomendado
Headphone and Earphone Output
The TPA311D family was specifically described by TI for low-voltage systems where internal speakers and external earphone operation are required. Its single-ended mode support can simplify an earphone-oriented design when the selected load, output level, and bias arrangement match the datasheet requirements. Use the integrated depop circuitry and verify startup and mode-change behavior in the final analog path. The device is best suited to small, efficient audio products rather than high-power headphone stages, and the exact 8-SOIC pin functions must be confirmed before layout release.
Recomendado
Small Consumer Audio Product
TPA311D can serve as the speaker driver in a small consumer audio product where a 3.3 V or 5 V supply and a compact surface-mount implementation are required. The verified 350 mW family rating and 3.3 V 8-ohm application condition provide useful sizing targets for low-volume playback, notification tones, and simple voice prompts. Its Class-AB operation can be advantageous when minimizing switching-node EMI is important, but the system designer should still budget regulator headroom and copper area. The final acoustic output must be measured with the actual speaker enclosure and battery or supply impedance.
Recomendado
Industrial Audible Alarm
TPA311D may be used for a low-power audible alarm or notification function in an embedded industrial or control product, particularly when the enclosure limits acoustic output and supply current. The 8-SOIC package supports conventional surface-mount assembly, while integrated thermal and short-circuit protection adds useful fault tolerance. The designer should select the BTL or single-ended mode according to the transducer and wiring, and verify that alarm tones remain within the amplifier’s distortion and bandwidth limits. Use filtering and layout techniques to prevent speaker currents from coupling into sensitive control or measurement circuitry.
Recomendado
USB or Battery-Powered Audio Accessory
TPA311D is a reasonable candidate for a battery-powered audio accessory when the required output is low and the system uses a 3.3 V or 5 V rail. The verified data confirms a compact 8-SOIC package and a mono Class-AB architecture, making it suitable for a small speaker or earphone accessory rather than a high-power listening system. The designer should account for battery-voltage variation, amplifier startup, depop behavior, and thermal dissipation. A low-noise or switching supply may be used upstream, but its ripple and transient behavior must be checked at the amplifier pins.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TPA311D — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TPA311DR |
|---|---|---|
| Package | 8-SOIC | 8-SOIC according to the supplied search comparison context |
| Brand | Texas Instruments | Texas Instruments |
Diferenciadores clave
- Documented low-voltage Class-AB audio operation (frente a TPA311DR)
- Flexible output topology (frente a TPA311DR)
- Integrated fault and transient features (frente a TPA311DR)
- Compact package integration (frente a TPA311DR)
Notas de diseño
Design the supply around the documented 3.3 V and 5 V operating conditions rather than assuming the 350 mW family rating is available continuously. At the verified 3.3 V, 8-ohm BTL condition, TI specifies 250 mW at less than 1% THD+N, so verify the load, supply tolerance, output amplitude, and thermal condition in the final design. Add local input bypassing and keep the return path short to reduce supply noise and unstable behavior.
Use the exact 8-SOIC pinout from the official manufacturer datasheet before routing the PCB. Keep audio input and output traces away from switching nodes and high-current supply paths, and provide a low-impedance ground connection for the amplifier. Confirm whether the selected output configuration is BTL or single-ended; changing topology can alter the speaker wiring, grounding requirements, and usable output mode.
Do not substitute TPA311D solely because another part is described as a similar mono audio amplifier. The supplied evidence does not verify a complete same-package, pin-compatible replacement, so a cross-reference should be checked for pin functions, supply range, BTL or SE behavior, distortion, protection, and thermal limits. The TPA311DR mention in the supplied search results is not sufficient by itself to approve a production substitution.
Class-AB amplification dissipates power as heat, particularly when supply voltage exceeds output voltage and current increases. Validate the amplifier using the intended speaker impedance, enclosure, ambient temperature, and maximum expected audio level. Measure SOIC copper temperature and compare it with the manufacturer’s thermal limits; do not infer safe operation solely from the nominal 350 mW headline rating.
Use the integrated depop circuitry as part of the startup and mode-transition design, but still observe output settling and audible clicks in the finished product. For BTL operation, both speaker terminals are signal outputs, so accidental grounding of one terminal can damage the amplifier or distort the audio. Keep speaker wiring short and controlled, and validate filtering or ferrite solutions only where they do not compromise the intended audio bandwidth.
Información de cumplimiento
The supplied verified data identifies the manufacturer, family features, distributor listing, package, and application information, but it does not provide explicit RoHS, REACH, halogen-free, lead-free, or conflict-minerals declarations for TPA311D.