Stk412-230 Datasheet Pdf May 2026

| Aspect | STK412-230 (Class AB) | Modern Class D (e.g., TPA3255) | |--------|----------------------|--------------------------------| | Power | 200W/ch | 300W/ch | | Efficiency | ~65% | >90% | | Heat | Requires large heatsink | Minimal heatsink | | Supply | Bipolar ±64V | Unipolar 48V | | Size | Large SIP module | Small IC + PCB | | Availability | Discontinued, difficult to find | Widely available |

The following values are typical for Vcc = ±48V, RL = 6Ω, f = 1kHz, Tc = 25°C.

| Parameter | Conditions | Min | Typ | Max | Unit | |-----------|------------|-----|-----|-----|------| | Output Power (both channels) | THD = 0.4% | 140 | 150 | - | W | | Total Harmonic Distortion | Po = 50W | - | 0.08 | 0.4 | % | | Frequency Response | -3dB, 1W | 20 | - | 50k | Hz | | Input Impedance | Non-inverting | 33 | 55 | 82 | kΩ | | Voltage Gain | Open loop | 80 | 85 | - | dB | | Closed Loop Gain | Typical circuit | - | 40 (x100) | - | dB | | Output Noise Voltage | A-weighted | - | 0.6 | 1.2 | mV | | Supply Current | Idle (no signal) | - | 120 | 180 | mA |

The STK412-230 represents a high-power, easy-to-use Class AB amplifier module that was once a staple of consumer and pro audio design. While now obsolete, its datasheet remains a valuable reference for repairing vintage equipment or understanding hybrid amplifier topology. For new designs, modern Class D amplifier ICs (e.g., from Texas Instruments or Infineon) are recommended, but the STK412-230's robust performance and simplicity still command respect among audio hobbyists and repair technicians.

This essay is a synthesized technical summary. For exact electrical characteristics, graphs, and application PCB layouts, please refer to the original manufacturer’s datasheet.

The STK412-230 is a classic example of Sanyo's thick-film hybrid integrated circuits, specifically designed as a two-channel shift power supply audio power amplifier. Unlike standard monolithic ICs, these hybrid modules house multiple semiconductor dies—like power transistors and resistors—mounted side-by-side on a ceramic substrate, creating a compact yet high-performance "black box" for high-fidelity audio equipment. Technical Highlights Stk412-230 Datasheet Pdf

Shift Power Supply Architecture: The "shifter" designation refers to its ability to handle dual-rail power supplies, improving efficiency and reducing heat dissipation during varied audio loads.

Power Output: While specific wattage for the "230" variant can vary by implementation, the STK412 series typically covers ranges from 70W to over 150W per channel.

Package Design: It usually comes in a SIP18 (Single Inline Package), allowing for vertical mounting to save PCB space and easier attachment to large aluminum heatsinks for thermal management.

High Fidelity: Known for low total harmonic distortion (THD), these modules were staples in 1990s and early 2000s home theater receivers and "mini-combo" systems. Practical Applications & Maintenance

For hobbyists and repair technicians, the STK412-230 is both a relic of high-end analog audio and a challenge to maintain. Since Sanyo stopped production, many modules found today are "new old stock" (NOS) or salvaged from legacy hardware. Are salvaged Sony ICs worth keeping? - Facebook | Aspect | STK412-230 (Class AB) | Modern Class D (e

STK412-230 is a two-channel, Class H audio power amplifier hybrid integrated circuit (IC) manufactured by

(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

: SIP18 (Single In-line Package with 18 pins) or 15-pin configurations depending on the specific series variant. Operating Temperature : Rated for standard industrial ranges, often up to 105 raised to the composed with power C for some certified modules. AliExpress Core Features & Design High Efficiency

: The built-in shift power supply circuit controls the voltage supplied to the power transistors, reducing heat dissipation compared to traditional Class AB amplifiers. Pin Configuration

: Typically includes 15 to 18 pins covering signal inputs, feedback loops, and power supply rails (VH and VL). Detailed pinout diagrams can be found on sites like Veswin Electronics Thermal Management The STK412-230 represents a high-power, easy-to-use Class AB

: Given its high power output, the IC requires a substantial heat sink to prevent thermal failure. Applications

The STK412-230 is frequently integrated into the following equipment: Home Theater Systems : Driving high-power stereo or multi-channel speakers. Professional Audio : Used in active speakers and mixers for events. Musical Instrument Amps

: Providing high-fidelity reproduction for guitar or keyboard amplifiers. DIY Projects

: A popular choice for hobbyists building custom high-power audio setups. Purchasing & Replacements

This component is considered an older or "obsolete" part but remains available through specialized distributors and marketplaces:

Advantages:

Limitations: