STK443 - 2Ch 5-25W AF Power Amp Hybrid IC | SANYO
Référence : STK443 ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $12.5 | $12,50 |
| 10 | $10.85 | $108,50 |
| 100 | $9.4 | $940,00 |
| 500 | $8.2 | $4 100,00 |
| 1 000 | $7.15 | $7 150,00 |
STK443 Présentation
An AF (audio-frequency) power amplifier is the final active stage in an audio reproduction chain that drives a loudspeaker from a low-level signal source such as a preamplifier, mixer, or DAC output. Hybrid AF power ICs integrate input and driver transistors, output power devices, and biasing components on a single ceramic substrate, distinguishing them from monolithic silicon audio ICs by their higher output power, higher supply voltage tolerance, and larger physical footprint. Within the broader component taxonomy, the STK443 belongs to the amplifier IC category, which itself is a subset of analog signal-chain ICs and ultimately of power management and signal-conditioning semiconductors.
The STK443 features a typical output of 2 x 25 W at low THD into a defined load impedance, operates over a wide supply range, and includes internal thermal protection. The dual-channel monolithic front end is followed by discrete power transistors mounted on the same substrate, a topology that lets the device source peak current demands while remaining economically viable for mass-produced stereo equipment. Built-in short-circuit and over-temperature shutdown protect the output stage against common fault conditions seen in consumer amplifiers.
Typical applications for the STK443 include home stereo amplifiers, integrated A/V receivers, karaoke mixing amplifiers, powered speaker systems, and musical instrument practice amplifiers. It is also found in automotive head-unit audio outputs and as a retrofit replacement module in legacy SANYO-designed equipment where the original STK-series hybrid has failed and a same-form-factor part is required to avoid PCB rework.
When designing with the STK443, observe the recommended heatsink thermal resistance and mounting torque to keep the substrate within its rated junction temperature under sustained full-power operation. Bypass supplies close to the module's VCC pins and use the recommended Zobel RC network across each output to maintain stability with reactive speaker loads.
This page synthesizes distributor availability, parametric drop-in alternatives, and practical design notes gathered from SANYO documents and aftermarket datasheets not typically aggregated by catalog distributors.
Alternatives de remplacement direct pour STK443 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
STK443-070
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
STK443-530
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
STK443-150
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
STK442-140
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
STK443 Valeurs maximales et caractéristiques électriques
| Product Type | AF Power Amplifier, 2 Channel |
| Manufacturer | SANYO (now Panasonic) |
| Construction | Thick Film Hybrid IC |
| Topologie | Class AB, dual channel (stereo) |
| Output Power (min per channel) | 5 W to 25 W |
| Number of Channels | 2 |
| Boîtier | SIP-10 (Single In-line Package, 10 formed leads) with integral heatsink tab |
| Type de montage | Through-Hole |
| Built-in Protection | Thermal shutdown, short-circuit protection (per datasheet) |
Configuration des broches de STK443
| Broche 1 | VCC — Positive supply rail |
| Broche 2 | OUT1 — Channel 1 speaker output |
| Broche 3 | GND1 — Channel 1 ground / bootstrap return |
| Broche 4 | GND — Substrate / main ground |
| Broche 5 | GND2 — Channel 2 ground / bootstrap return |
| Broche 6 | OUT2 — Channel 2 speaker output |
| Broche 7 | VEE — Negative supply rail (dual-rail operation) |
| Broche 8 | IN2 — Channel 2 audio input |
| Broche 9 | GND-S — Input signal ground / bias ground |
| Broche 10 | IN1 — Channel 1 audio input |
Applications typiques
STK443 convient pour 6 applications: Home Stereo Power Amplifier Module, Integrated A/V Receiver Audio Stage, Karaoke Mixing Amplifier, Powered Speaker System / Active Monitor, Automotive Head-Unit Audio Output, Retrofit Repair of Legacy SANYO Audio Equipment.
Home Stereo Power Amplifier Module
The STK443 is well matched to a traditional two-channel home stereo amplifier module because it integrates 2 x 25 W class-AB output stages onto a single hybrid substrate, simplifying the BOM by replacing discrete complementary-pair designs with one part. Engineers place the SIP-10 module on the main board with a chassis-mounted heatsink and feed it from a split +/- supply; this topology delivers lower THD than legacy discrete designs at the same BOM cost.
Recommandé
Integrated A/V Receiver Audio Stage
Inside an integrated A/V receiver, the STK443 acts as the dedicated left and right front-channel amplification stage, taking a line-level pre-amplified signal and driving the main loudspeakers. The hybrid IC's 2-channel single-package format is more compact than two mono modules, easing receiver chassis layout. The integrated thermal and short-circuit protection prevents output-stage failure during speaker-cable short events common during receiver installation.
Recommandé
Karaoke Mixing Amplifier
Karaoke mixing amplifiers need stereo amplification plus plenty of headroom for sustained vocal peaks and microphone feedback handling. The STK443's 25 W per channel rating and hybrid thermal mass give it the headroom needed for repeated high-RMS vocal passages, while its integrated thermal shutdown prevents speaker damage if a feedback loop drives the output stage into hard clipping. The SIP-10 package is well suited to the metal chassis typical of karaoke mixer products.
Recommandé
Powered Speaker System / Active Monitor
Inside an active two-way loudspeaker or near-field studio monitor, the STK443 provides the integrated power stage for the built-in amplifier module, accepting a balanced or unbalanced line input from the crossover network. The hybrid IC's compact SIP-10 outline fits in the tight space behind the speaker baffle, and its heatsink tab couples directly to the speaker enclosure to dissipate output-stage losses. This converts a passive loudspeaker into a self-powered unit without redesigning the analog front end.
Recommandé
Automotive Head-Unit Audio Output
The STK443 has historically been specified for automotive head-unit main amplifier stages where 12 V battery-rail operation and elevated ambient temperatures inside a dashboard demand a robust hybrid output stage. The module's built-in thermal protection is well matched to the closed, high-temperature dashboard environment; derated output power and a chassis-bonded heatsink keep the substrate within its rating through long summer commutes.
Recommandé
Retrofit Repair of Legacy SANYO Audio Equipment
The most common 2026 use case for the STK443 is the board-level retrofit replacement of an originally SANYO-designed stereo amplifier or receiver whose original STK-series hybrid IC has failed. End-of-life replacements target the exact SIP-10 footprint so the repair requires only desoldering and resoldering one module - no PCB rework, no resizing of the heatsink cutout, and no re-engineering the supply rail filtering. Distributors like Veswin Electronics still stock date-coded inventory for this application.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour STK443 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | STK443-070 | STK443-530 | STK443-150 | STK442-140 |
|---|---|---|---|---|---|
| Package | SIP-10 with heatsink tab | SIP-10 with heatsink tab (same) | SIP-10 with heatsink tab (same) | SIP-10 with heatsink tab (same) | SIP-10 with heatsink tab (same) |
| Brand | SANYO (Panasonic successor) | SANYO (Panasonic) | SANYO (Panasonic) | SANYO (Panasonic) | SANYO (Panasonic) |
| Channels | 2 (stereo) | 2 (stereo) | 2 (stereo) | 2 (stereo) | 2 (stereo) |
| Output Power (per channel) | 5 W to 25 W min | Slightly higher than base STK443 (per Veswin) | Higher than STK443 (per AliExpress comparison) | Comparable to STK443 at +/-28 V rail | 2 x 40 W (significantly higher) |
| Topology | Class AB, hybrid thick-film | Class AB, hybrid thick-film | Class AB, hybrid thick-film | Class AB, hybrid thick-film | Class AB, hybrid thick-film |
| Thermal / Short-Circuit Protection | Yes (per datasheet) | Yes | Yes | Yes | Yes |
| Lifecycle Status | Obsolete (Panasonic) | Obsolete (aftermarket stock) | Obsolete (aftermarket stock) | Obsolete (aftermarket stock) | Obsolete (aftermarket stock) |
Principaux différenciateurs
- Single-package 2-channel 25 W output with integrated thermal shutdown (vs Discrete complementary-pair discrete transistor output stage)
- Heatsink-tab SIP-10 package designed for through-hole legacy amplifier repair (vs Modern SMD audio amplifier ICs (e.g. Class D TAS57xx))
- Compatible across the broader SANYO STK44x hybrid family (vs STK443-530 or STK443-150 siblings)
Notes de conception
Estimated: at 2 x 25 W into 8 ohm with a split +/- 25 V rail, each output stage dissipates roughly (VCC - Vout_peak) * Iout_average / channel - typically 5-8 W per channel at continuous sine drive. Substrate power dissipation must be sunk through the SIP-10 metal tab into a chassis or external heatsink with thermal grease; if a 1.5 C/W heatsink is used, the heatsink-to-air thermal resistance keeps the junction within 65 C rise at full power. Without a heatsink the device will repeatedly enter thermal shutdown under sustained high-RMS playback such as rock music or karaoke vocals.
Do not substitute STK443 with a STK443-530 or STK443-150 without verifying the variant's supply rail and output stage protection thresholds. The STK443-530 has rail-sensing circuitry that the base STK443 lacks, which can change the audible behavior under dynamic clipping. Likewise, the STK442-140 has different internal biasing and produces a higher DC offset at the outputs - per the AliExpress comparison cited in the cross-reference data, this can affect downstream speaker-protection relay thresholds in legacy designs.
Place the recommended Zobel network (typically 0.1 uF + 10 ohm in series) directly between each speaker output and ground to keep the amplifier stable with reactive loads such as electrostatic tweeters or bass-reflex ported enclosures. The SIP-10 module must be oriented vertically with the leads pointing down to the PCB and the metal heatsink tab either screwed to the chassis or pressed against a through-bolted heatsink with thermal interface material - horizontal mountings trap heat and reduce long-term reliability.
Informations de conformité
Original SANYO STK443 predates RoHS and uses tin-lead plating on its leads; aftermarket equivalents may be RoHS but are not guaranteed. Automotive AEC-Q100 qualification is not applicable because the part is legacy consumer audio. Specific REACH, halogen, and conflict-minerals statements were not located in the verified web data; treat as unknown until the manufacturer's environmental declaration is retrieved.
