STK4432 - 25W+25W AF Power Amplifier Hybrid IC | Sanyo
N.º de pieza: STK4432 ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.65 | $76,50 |
| 100 | $6.8 | $680,00 |
| 500 | $6.1 | $3.050,00 |
| 1.000 | $5.45 | $5.450,00 |
STK4432 Descripción general
An AF power amplifier hybrid IC is a co-packaged module that integrates a driver stage, output transistors, and (typically) protection circuitry on a single ceramic substrate with an aluminum heatsink tab. The thick-film hybrid topology sits in the hierarchy between monolithic Class-AB audio amplifier ICs (e.g., TDA7293, LM3886) and discrete Darlington output stages, occupying a niche defined by high output power, simplified BOM, and moderate PCB footprint.
Key specifications include a recommended supply voltage range suitable for 2-channel 25W operation, a maximum case temperature of 125 degrees C permitting reduced heatsink sizing, and built-in thermal protection. The slim 31 mm package enables compact stereo receiver designs, while pin compatibility with STK430 series drop-in replacements supports legacy repair and design refresh cycles.
The internal architecture uses a complementary Class-AB push-pull output stage with on-chip bias stabilization and DC offset minimization, achieving the 1.0 percent THD figure at rated output. Operating voltage is unipolar single-rail (typical ±25V or single 25V depending on application circuit), with the device dissipating up to 30W at the IC level under simultaneous two-channel sine-wave drive.
Typical applications include home stereo integrated amplifiers, karaoke systems, multimedia speaker amplifiers, and replacement boards for legacy consumer audio equipment originally designed around the STK430/STK4100/STK4200 series.
When designing with this device, use a heatsink sized to keep case temperature below 125 degrees C at maximum continuous output, and follow the reference printed circuit board layout from the manufacturer datasheet to maintain channel-to-channel isolation and minimize THD.
This page synthesizes manufacturer datasheet specifications, distributor sourcing data, drop-in pin-compatible alternatives, and practical design notes not found in any single distributor listing.
Alternativas directas para STK4432 — 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:
STK443-3
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STK4430
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STK430
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STK435
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
STK4432 Valores máximos y características eléctricas
| Manufacturer | Sanyo Semiconductor (now onsemi) |
| Product Type | Thick-Film Hybrid AF Power Amplifier IC |
| Number of Channels | 2 (stereo) |
| Output Power (per channel) | 25 W minimum (THD = 1.0%) |
| Total Output Power | 50 W (25W + 25W) |
| Total Harmonic Distortion (THD) | 1.0% maximum at rated output |
| Load Impedance | 8 ohm |
| IC Power Dissipation | 30 W maximum (simultaneous 2-ch sine drive) |
| Maximum Case Temperature | 125 degrees C |
| Package Type | Single-In-Line Slim Hybrid Module |
| Package Height | 31 mm |
| Pin Compatibility | Pin-compatible with STK430 series |
| Tipo de montaje | Through-hole (heatsink tab with mounting holes) |
| Datasheet Document Reference | Sanyo No. 2885 (per datasheet header) |
| Estado RoHS | unknown |
Configuración de pines de STK4432
| Pin 1 | GND — Ground (substrate tab also grounded) |
| Pin 2 | OUT1 — Channel 1 output |
| Pin 3 | VCC1 — Channel 1 supply rail |
| Pin 4 | NC — Not connected (per STK430-series pinout) |
| Pin 5 | IN1 — Channel 1 input |
| Pin 6 | GND — Ground |
| Pin 7 | IN2 — Channel 2 input |
| Pin 8 | NC — Not connected (per STK430-series pinout) |
| Pin 9 | VCC2 — Channel 2 supply rail |
| Pin 10 | OUT2 — Channel 2 output |
| Pin 11 | GND — Ground |
| Pin TAB | CASE — Metal substrate tab / heatsink mounting surface |
Aplicaciones típicas
STK4432 es adecuado para 6 aplicacións: Home Stereo Integrated Amplifier, Karaoke Amplifier Module, Multimedia PC Speaker Amplifier, Replacement Board for Legacy STK430 Series Amps, Powered Bookshelf Speaker, Educational DIY Audio Amplifier Kit.
Home Stereo Integrated Amplifier
The STK4432 delivers 25W+25W into 8 ohm at 1.0 percent THD, making it a strong fit for entry-level home stereo integrated amplifiers where a single hybrid module replaces dozens of discrete output transistors. The 31 mm slim package enables slimline chassis designs (under 80 mm height) while the 125 C case temperature rating allows a compact bolt-on heatsink. The same application circuit documented in the datasheet reference design powers complete two-channel amps with under 0.1 percent THD at typical listening levels.
Recomendado
Karaoke Amplifier Module
Karaoke amplifiers typically need 20-30W per channel with moderate THD and a simple BOM, exactly matching the STK4432 design target. The hybrid's built-in thermal protection suits the long duty cycles of karaoke playback, while its 125 C case temperature limit lets designers use a smaller clamp-on heatsink than the older discrete output stage would require. Per-channel 25W drives typical 6-inch karaoke speakers to comfortable room-filling levels.
Recomendado
Multimedia PC Speaker Amplifier
Active multimedia speakers for PCs and gaming rigs benefit from the STK4432's compact hybrid form factor and 25W+25W output. The 31 mm slim package drops into the back panel of a typical 2.1 or 2.0 speaker set, and pin-compatibility with the legacy STK430 family means board layouts shared between 10W, 20W, and 25W products can be field-upgraded. Combined 50W output is more than enough for desktop nearfield listening.
Recomendado
Replacement Board for Legacy STK430 Series Amps
Hundreds of vintage receivers and integrated amps from the 1980s and 1990s used the STK430 series and now need service replacements. The STK4432 drops directly into the original mounting holes and connector pins, with 25W+25W typical at 8 ohm matching the original spec or slightly exceeding it. Repair technicians use the STK4432 datasheet pinout to cross-verify against the original STK430-series board layout.
Recomendado
Powered Bookshelf Speaker
Powered bookshelf speakers pair a stereo amp with passive drivers and need a low-profile power stage. The 31 mm slim-package STK4432 fits behind an 8-inch woofer magnet or inside the rear port of a typical bookshelf enclosure, providing the two channels needed for L/R stereo in a single module. Per the datasheet, the 125 C case temperature guarantee allows the engineer to use the speaker cabinet itself as part of the thermal solution.
Recomendado
Educational DIY Audio Amplifier Kit
Hobby and educational audio amplifier kits benefit from the STK4432 because it eliminates the discrete output stage build step while still exposing students to amplifier concepts like biasing, feedback, and heatsink calculation. The datasheet's reference PCB layout and 30W IC dissipation curve are perfect teaching examples. The STK4432's STK430 pinout lets teachers swap modules for different power points (STK430 at 10W, STK4432 at 25W) without reworking the kit board.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para STK4432 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | STK443-3 | STK4430 | STK430 |
|---|---|---|---|---|
| Package | Sanyo Single-In-Line Slim 31 mm Hybrid | Sanyo Single-In-Line Slim 31 mm Hybrid (same) | Sanyo Single-In-Line Slim 31 mm Hybrid (same) | Sanyo Single-In-Line Slim 31 mm Hybrid (same) |
| Brand | Sanyo | Sanyo | Sanyo | Sanyo |
| Output Power (per channel, min) | 25 W (THD 1.0%) | 30 W (THD 1.0%) | 20 W (THD 1.0%) | 10 W (THD 1.0%) |
| Channels | 2 | 2 | 2 | 2 |
| Load Impedance | 8 ohm | 8 ohm | 8 ohm | 8 ohm |
| IC Power Dissipation | 30 W max | 33 W max | 27 W max | 18 W max |
| Max Case Temperature | 125 C | 125 C | 125 C | 125 C |
| Pin Series | STK430 compatible | STK430 compatible | STK430 compatible | STK430 (native) |
| Lifecycle | Obsolete (NRND) | Obsolete (NRND) | Obsolete (NRND) | Obsolete (NRND) |
Diferenciadores clave
- Pin-compatible with STK430 family (frente a STK443-3)
- Mid-tier power point in the STK430 family (frente a STK4430)
- Higher output within the slim STK430 family (frente a STK430)
Notas de diseño
Estimated: At 25W+25W simultaneous sine-wave output into 8 ohm, the STK4432 dissipates approximately 30 W internally per the datasheet IC Power Dissipation spec. Using a small clip-on aluminum heatsink with thermal resistance below 1.0 C/W will keep case temperature within the 125 C limit. Apply thermal compound between the ceramic substrate tab and the heatsink; the metal tab is also the primary ground reference.
Use the manufacturer reference PCB layout (datasheet page 3) to preserve the input-to-output signal trace separation that minimizes THD. Place the input coupling capacitors (typically 1-4.7 uF) close to IN1/IN2 pins and keep them away from the OUT1/OUT2 high-current traces. The substrate ground tab must NOT share the same PCB copper pour as the input signal ground to avoid ground-loop feedback hum.
Critical: The STK4432 is obsolete/NRND, so sourcing is dependent on independent distributors. Verify supplier authenticity and traceability before production use; counterfeit STK modules from unauthorized sources are common. For new designs, use a modern monolithic solution (e.g., TPA3116 Class-D, or LM3886/TDA7293 Class-AB) unless repair of legacy equipment is the primary use case.
Información de cumplimiento
The STK4432 datasheet (Sanyo No. 2885) does not state explicit RoHS / REACH compliance. The part is classified obsolete and predates many modern compliance declarations. For new designs requiring RoHS, consider modern alternatives.
