Description
Powerful 25W+25W Stereo Audio Power Amplifier Module
The STK4432 is a high-performance thick-film hybrid integrated circuit from Sanyo's dependable audio lineup. Delivering a continuous 25 Watts per channel, this 15-pin module is the ideal power stage for mid-sized stereo receivers, integrated amplifiers, and premium active speaker systems. It is renowned for its excellent cost-performance and rugged thermal stability.
Designed to be pin-compatible with the STK430 series, the STK4432 allows for easy integration and repair of vintage hardware. It provides a crisp, analog sound signature with a Total Harmonic Distortion (THD) of 1.0% at full rated power and an impressive frequency response reaching up to 100kHz.
Key Technical Features:
- Continuous Power Output: 25W + 25W (at 8Ω, f = 1kHz, THD = 1.0%).
- Configuration: 2-Channel Stereo in a 15-Pin SIP (Single In-line Package).
- Frequency Response: Ultra-wide bandwidth from 20Hz to 100kHz (+0, -3dB).
- Thermal Reliability: Guaranteed operation up to 125°C substrate temperature for extended life.
- Low Distortion: Typically 0.3% THD at low output (0.1W) for clear, detailed listening.
- Operating Voltage: Recommended supply of 49V DC (Absolute Maximum 70V).
Installation & Safety Guide:
As a 50W total output module, the STK4432 generates significant heat. It must be securely mounted to a clean, flat heatsink using high-quality thermal silicone grease. Operating this module without a heatsink—even for a five-second diagnostic check—will cause immediate and permanent internal substrate failure.
Technician's Note: Before installation, verify that the power supply voltage is stable (ideally near 49V) and discharge all filter capacitors. We recommend checking the output coupling capacitors, as dried-out electrolytic caps in vintage gear are the primary cause of module stress and audio clipping.