STA550 - 70W Stereo Class AB Power Amplifier | STMicroelectronics
N.º de pieza: STA550 ✗ 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 |
STA550 Descripción general
A Class AB audio amplifier is a voltage-controlled amplifier that uses continuous transistor conduction to reproduce audio signals with relatively low crossover distortion. In the broader hierarchy, the STA550 belongs to audio amplifiers, linear power amplifiers, and power management semiconductors. Its bridge configuration develops voltage across the load, while the integrated output stage and multi-pin package simplify the implementation of high-power stereo audio compared with discrete amplifier circuitry.
The STA550 is designed around the BASH architecture and is intended to work with the STABP01 digital processor for programmable feedback, compression, and related system functions. According to the manufacturer datasheet information, the device includes high-dynamic-range preamplifier input stages, external programmable feedback, compressors, and AC-coupled Class AB bridge inputs. The module therefore serves as the output-power stage in an assisted audio system rather than as a conventional standalone line-input amplifier.
Its specified output levels cover several practical use cases. The 55 W per channel at 0.5% THD rating is useful when lower distortion is important, while the 70 W per channel at 10% THD point represents maximum output power. The 4 ohm and 8 ohm load support gives designers flexibility in speaker impedance. Exact supply voltage, current, gain settings, thermal limits, and protection thresholds must be confirmed from the manufacturer datasheet before layout or production use.
Typical uses include multimedia speakers, active loudspeakers, home-audio systems, and powered speaker enclosures requiring substantial stereo output in a compact module. The vertically mounted 27-Flexiwatt package requires careful PCB layout, adequate copper for heat spreading, and attention to the manufacturer's recommended thermal and electrical interface.
A key design consideration is that this high-power amplifier can dissipate substantial heat during sustained operation. Thermal performance depends on the PCB copper area, supply impedance, load, output level, and ambient temperature; adequate heat spreading and stable rail design are therefore more important than generic decoupling alone.
This product record combines verified manufacturer and distributor descriptions, source-linked pricing availability, package-oriented replacement analysis, and practical design notes to help engineers evaluate the STA550 for BASH-based Class AB stereo amplifier designs.
Alternativas directas para STA550 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
STA559
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
STA5598W
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
STA517A
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STA515
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STA311M
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STA550 Valores máximos y características eléctricas
| Product Type | Fully integrated stereo Class AB power module |
| Channel Count | 2 channels |
| Amplifier Configuration | Bridge stereo Class AB |
| Output Power at 0.5% THD | 55 W + 55 W at RL = 4/8 ohm |
| Maximum Output Power | 70 W + 70 W at RL = 4/8 ohm and THD = 10% |
| Total Harmonic Distortion | 0.5% at 55 W + 55 W and 10% at 70 W + 70 W |
| Supported Load Impedance | 4 ohm or 8 ohm |
| Architecture | BASH amplifier architecture with STABP01 digital processor |
| Preamplifier | High-dynamic preamplifier input stage |
| Feedback | External programmable feedback |
| Signal Conditioning | Compressors |
| Input Coupling | AC-coupled input |
| Power Package | 27-Flexiwatt vertical |
| Tipo de montaje | Vertical surface-mount power package |
| Output Stage | Integrated Class AB bridge output |
| DigiKey Availability Statement | Buy now, ships today |
Guía de configuración de pines de STA550 27-flexiwatt vertical
Configuración de pines para STA550 (encapsulado 27-flexiwatt vertical). 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 STA550.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
STA550 es adecuado para 6 aplicacións: Powered Multimedia Speakers, Active Home-Audio Loudspeakers, Digital Active Speaker System, Professional Audio Monitor, Compact High-Power Speaker, BASH Reference Speaker Platform.
Powered Multimedia Speakers
The STA550 fits powered multimedia speakers because it delivers 55 W + 55 W at 0.5% THD into 4 ohm or 8 ohm loads in one integrated stereo module. Its bridge Class AB output reduces the external output-component count compared with a discrete implementation, while the 70 W + 70 W capability at 10% THD provides additional peak-output headroom. The amplifier can sit behind an STABP01-based signal path when the enclosure requires adjustable feedback, compression, or speaker protection. Layout must still provide the copper area and thermal path needed for sustained high-power playback, and supply and protection values should be taken from the manufacturer datasheet rather than inferred from the output rating.
Recomendado
Active Home-Audio Loudspeakers
The STA550 is appropriate for an active home-audio loudspeaker requiring 4 ohm or 8 ohm compatibility and substantial stereo output. The 55 W per channel rating at 0.5% THD supports cleaner reproduction at moderate listening levels, whereas the 70 W per channel point at 10% THD can supply additional output during transients. Its high-dynamic preamplifier inputs and programmable external feedback make it useful in a BASH-controlled enclosure, but the actual crossover, input sensitivity, and gain network must be designed from verified application guidance. Thermal verification under continuous sine-wave loading is critical because consumer cabinets may restrict airflow.
Recomendado
Digital Active Speaker System
A digitally controlled active speaker benefits from the STA550's integration with the BASH architecture and STABP01. The power module supplies 55 W + 55 W at 0.5% THD, while programmable feedback and compression can be coordinated by the digital processor for repeatable voicing and protection behavior. The STA550 handles the power-amplification stage; it does not replace the DAC, signal processor, or output-device design. When implementing this arrangement, preserve the recommended input network and grounding topology, keep sensitive control traces away from power-current paths, and validate speaker excursion and thermal limits with the complete enclosure rather than the bare amplifier module.
Recomendado
Professional Audio Monitor
The STA550 can serve as the stereo output stage of a professional monitor when the system is built around the intended BASH control architecture. Its 0.5% THD rating at 55 W per channel is more useful for sustained monitoring than the 70 W per channel rating at 10% THD, which is better treated as a peak-output condition. The bridge topology and integrated package reduce assembly complexity, but low-level audio integrity still depends on the upstream converter, input filtering, grounding, and output-network implementation. Use shielded or properly routed interconnects, provide local supply decoupling, and verify maximum thermal rise under the monitor's rated continuous-output test condition.
Recomendado
Compact High-Power Speaker
The STA550 supports compact high-power speaker designs where 55 W + 55 W output and bridge operation are desired without a board full of discrete output transistors. Supporting both 4 ohm and 8 ohm loads gives the amplifier broader compatibility with common speaker configurations, although the selected impedance materially changes power dissipation and thermal requirements. The 27-Flexiwatt vertical package is not a substitute for proper heat sinking, so the PCB should use the manufacturer's recommended copper pattern and thermal interface. Before production, test with realistic music and sustained full-power tones to identify enclosure-related heating and any output-stage protection behavior.
Recomendado
BASH Reference Speaker Platform
The STA550 is directly aligned with a BASH reference-speaker platform because the manufacturer describes it as a fully integrated power module intended to operate with an STABP01 digital processor. Its programmable external feedback and compressor functions support controlled speaker behavior, while the bridge Class AB output reaches 55 W + 55 W at 0.5% THD. This makes it more suitable for a BASH-derived design than an ordinary fixed-gain analog amplifier. Engineers should preserve the reference feedback network and validate stability, gain margin, phase response, and loudspeaker protection with the actual filter and transducer. Any adaptation should be checked against the latest manufacturer guidance.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para STA550 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | STA559 | STA5598W | STA517A | STA515 | STA311M |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Product Type | Fully integrated stereo Class AB power module | Stereo power amplifier | Stereo power amplifier | Power amplifier | Power amplifier | Class AB power amplifier |
Diferenciadores clave
- Provides both low-distortion and maximum-output power points (frente a STA559)
- Uses an integrated bridge Class AB stereo power module (frente a STA5598W)
- Directly aligned with the BASH and STABP01 architecture (frente a STA515)
Notas de diseño
Treat the 70 W + 70 W rating as a maximum-output condition rather than a continuous thermal design point. Estimated: if each channel averages 30 W of electrical output power at 10% amplifier efficiency, total dissipation is approximately 6.7 W across both channels. Confirm the real efficiency from the manufacturer operating data, then allocate PCB copper according to the recommended package layout and verify the junction-temperature margin in the final enclosure.
Use the manufacturer-recommended land pattern and thermal-copper arrangement for the 27-Flexiwatt vertical package. The verified snippets do not expose lead pitch, pad dimensions, or the exposed thermal connection, so the PCB footprint must be taken directly from the STA550 package drawing rather than inferred from the package power rating. Keep output-current paths compact, provide a low-impedance supply return, and confirm that copper planes remain within the intended thermal design.
Separate the high-current audio-output path from low-level input, feedback, and processor-control traces. AC-coupled inputs still require a stable reference to ground, so use the manufacturer's recommended input network and place its return-current path away from the output-current loop. Feedback components are especially sensitive to parasitic pickup: keep their nodes compact, avoid routing beneath output-current paths, and validate stability in the assembled speaker rather than on an unloaded bench.
Do not compare 70 W at 10% THD directly with a competitor's continuous rating at lower distortion. The STA550's clearly stated 55 W + 55 W point is at 0.5% THD, while 70 W + 70 W is at 10% THD; matching the load, supply, channel configuration, and distortion criterion is essential. Likewise, verify whether the selected 4 ohm or 8 ohm speaker combination is permitted by the complete system configuration before applying the output rating.
Design the supply path for transient current as well as nominal output power. Estimated: two channels delivering 55 W each into 4 ohm draws about 27.5 A total output power, and actual supply current will be higher after allowing for amplifier inefficiency. This estimate is not a datasheet specification; use the verified supply requirements, permitted load configuration, protection scheme, and recommended bulk and high-frequency decoupling from the manufacturer documents before selecting inductors, capacitors, and copper widths.
Información de cumplimiento
The supplied verified search results do not state STA550 environmental compliance or qualification information. These fields remain unknown rather than inferred from the manufacturer, distributor, or package family.
