Description
Classic 20W+20W Stereo Audio Power Amplifier Module
The STK4803 is a reliable thick-film hybrid integrated circuit manufactured by Sanyo. Delivering a minimum continuous output of 20 Watts per channel, this 16-pin module was a centerpiece in mid-range stereo receivers and integrated audio systems during the peak of the analog era. It is renowned for its durability and its smooth, high-fidelity sound reproduction.
Built using Sanyo's proprietary Insulated Metal Substrate Technology (IMST), the STK4803 provides excellent thermal stability and high-output headroom. It features integrated protection circuitry to safeguard your speakers and internal components, making it the definitive choice for restoring vintage Japanese audio hardware to its original factory performance.
Key Technical Features:
- Continuous Power Output: 20W + 20W (at 8Ω, 20Hz to 20kHz, THD = 0.2% typical).
- Configuration: 2-Channel Stereo in a standard 16-Pin SIP (Single In-line Package).
- High-Fidelity Response: Wide frequency range from 20Hz to 50kHz (+0, -3dB).
- Integrated Protection: Built-in safeguards against over-temperature and short circuits.
- Thermal Management: Designed for efficient heat transfer with a max substrate temperature of 125°C.
- Operating Voltage: Recommended supply of ±25V to ±35V DC (Dual Supply).
Installation & Safety Guide:
The STK4803 generates thermal energy during operation that must be properly managed. It must be securely mounted to a clean, flat heatsink using a fresh layer of high-quality thermal silicone grease. Operating this module without a proper heatsink—even for a five-second diagnostic check—will result in immediate and permanent internal substrate failure.
Technician's Note: Before installing, verify that your dual-polarity power supply rails are symmetrical and discharge all filter capacitors. We recommend checking the output coupling capacitors and emitter resistors (typically 0.22Ω to 0.47Ω), as these are common failure points in older equipment that can stress the new module.