: Amplified audio signal out to the speaker network.
Because the STK412 series was widely used in mass‑produced equipment, it remains a for repairing vintage amplifiers, receivers, and powered mixers. Platforms like Amazon list the device specifically for this purpose.
The STK412-230 operates on a Class-H output stage architecture. This means it utilizes dual-voltage power supplies (low voltage and high voltage rails) to dynamically switch power based on the input signal level. This drastically reduces heat dissipation and improves efficiency compared to traditional Class-AB amplifiers. Value / Rating Sanyo (now ON Semiconductor) Package Type SIP (Single In-line Package) Hybrid IC Output Power 100W + 100W up to 150W + 150W (depending on Vcc) Speaker Impedance Ωcap omega Ωcap omega Maximum Supply Voltage ( ±plus or minus Vcc max) Dual rails (e.g., ±plus or minus ±plus or minus ±plus or minus Vcc2 High: ±plus or minus Total Harmonic Distortion (THD) 0.8% or lower at rated output (20Hz – 20kHz) Frequency Response 20 Hz to 50 kHz STK412-230 Pinout Configuration
: A popular choice for hobbyists building custom high-power audio setups. Purchasing & Replacements Stk412-230 Datasheet Pdf
You can find the full technical diagrams, pinouts, and electrical characteristics through the following providers:
(now part of ON Semiconductor/Panasonic). It is widely used in high-fidelity home audio systems, receivers, and DIY amplifier projects due to its built-in "shift power supply" technology, which significantly improves efficiency by switching supply voltages based on the input signal level. IC Components Technical Specifications According to various technical summaries and the STK412-230 Datasheet (PDF) , the key specifications include: Power Output : Delivers between 100W to 150W per channel Amplifier Class , utilizing a high-efficiency switching mechanism. Operating Voltage Max High Voltage (VH) plus or minus 75 cap V Max Low Voltage (VL) plus or minus 43 cap V Typical Dual Supply plus or minus 35 cap V plus or minus 55 cap V Package Type
The STK412-230 operates on a split power supply and utilizes Sanyo’s proprietary insulated metal substrate technology (IMST). This technology ensures excellent heat dissipation and a low noise floor. Value / Rating Class H (Dual Supply Switching) Output Power 100W + 100W (Stereo) Load Impedance Ωcap omega Ωcap omega Maximum Supply Voltage ( VCCV sub CC end-sub Max) ±plus or minus 75V (High Voltage Stage) Recommended Supply Voltage ±plus or minus 50V (High), ±plus or minus Total Harmonic Distortion (THD) 0.8% at rated power (20Hz - 20kHz) Frequency Response 20Hz to 50kHz Package Type Sanyo SIP (Single In-line Package) 2. Understanding Class-H Efficiency in the STK412-230 : Amplified audio signal out to the speaker network
The STK412‑230 is a capable of delivering significant output power with minimal heat loss. It belongs to Sanyo’s well‑known STK412‑000 series of Class‑H audio power amplifier hybrid ICs , each incorporating a built‑in shift power supply circuit that greatly enhances real‑world efficiency.
The STK412-230 is a built on a single insulated metal substrate. Internally, it contains:
: Given its high power output, the IC requires a substantial heat sink to prevent thermal failure. Applications The STK412-230 operates on a Class-H output stage
Direct outputs to the speaker terminals (via a protection relay circuit). Control & Standby
: The "shifter" designation refers to its ability to handle dual-rail power supplies, improving efficiency and reducing heat dissipation during varied audio loads.
Authoritative datasheets and product listings from sources like Veswin Electronics IC Components define the following core parameters: Output Power: 150W + 150W (min) into an 8-ohm load. Amplifier Class: Operating Voltage:
| Parameter | Rating | Notes | |-----------|--------|-------| | | 200W + 200W (Typical) @ 6Ω, THD = 0.4% | For music playback | | Maximum Supply Voltage | ±69 V (No signal) / ±64 V (with signal) | High voltage requirement | | Recommended Load Impedance | 6Ω to 16Ω | 4Ω not recommended due to current limits | | THD (Total Harmonic Distortion) | 0.01% (typ) at 1kHz, 100W | Very low for class AB | | Frequency Response | 20Hz to 50kHz (+0/-3dB) | Wide bandwidth | | Quiescent Current | 120 mA (typical per channel) | High bias for low crossover distortion | | Input Sensitivity | 1.6V RMS for rated output | Requires a preamp driver | | Signal-to-Noise Ratio | 112 dB (A-weighted) | Excellent |
| Parameter | Rating / Value | |-----------|----------------| | | 230W + 230W (Stereo) into 6Ω at ±55V, THD = 0.4% | | Total Harmonic Distortion (THD) | 0.08% (at 1kHz, 50W) | | Frequency Response | 20Hz – 50kHz (-3dB) | | Supply Voltage Range | ±35V to ±65V | | Quiescent Current | 100 mA (typical) | | Load Impedance | 6Ω (recommended), 8Ω (acceptable) | | Input Sensitivity | 1.2V for rated output | | Signal-to-Noise Ratio (S/N) | 110 dB (A-weighted) | | Package | SIP-15 (Single Inline Package with 15 pins) |