Power amplifier IC (audio power amplifier, hybrid SIP).
The STK412530 comes in a 16-pin SIP (Single Inline Package) with a staggered lead pitch. Below is the pin assignment as listed in the datasheet:
| Pin No. | Symbol | Function | |---------|--------|----------| | 1 | +Vcc | Positive power supply (+25.5V) | | 2 | OUT1 | Channel 1 output (to speaker) | | 3 | GND | Ground (power and signal return) | | 4 | -Vcc | Negative power supply (-25.5V) | | 5 | IN1- | Channel 1 non-inverting input (or inverting – check schematic) | | 6 | IN1+ | Channel 1 inverting input (signal input usually) | | 7 | GND | Ground | | 8 | IN2+ | Channel 2 inverting input | | 9 | IN2- | Channel 2 non-inverting input | | 10 | GND | Ground | | 11 | -Vcc | Negative power supply | | 12 | OUT2 | Channel 2 output | | 13 | +Vcc | Positive power supply | | 14 | NC | No connection (or internal compensation) | | 15 | Bootstrap 1 | Bootstrap capacitor for channel 1 | | 16 | Bootstrap 2 | Bootstrap capacitor for channel 2 |
Important: Many online copies of the stk412530 datasheet have contradictory pin assignments. Always download the original SANYO document. Pins 5,6 and 8,9 are the differential input stages. Usually, pin 6 and 8 are signal inputs via a coupling capacitor. stk412530 datasheet
Sanyo / STK series (hybrid amplifier modules). Commonly used in stereo power amplifier applications.
The original STK412-530 is obsolete (discontinued by Sanyo/ON Semi). However, its datasheet is still available from:
Caution: Beware of counterfeit STK modules (especially from online marketplaces). Genuine parts have consistent epoxy finish, laser-etched markings, and correct pin resistance between pins. Power amplifier IC (audio power amplifier, hybrid SIP)
Based on the stk412530 datasheet and reverse-engineered commercial products, the IC is found in:
The datasheet provides a recommended application circuit, which is vital for DIY builders. Key components usually found in the surrounding circuit include:
If you are replacing a blown unit, it is highly recommended to check the surrounding resistors and capacitors. A shorted STK module can sometimes damage the feedback resistors, causing a new module to fail immediately upon installation. Caution: Beware of counterfeit STK modules (especially from
| Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Maximum Supply Voltage | ( V_CC ) max | (\pm 45) | V | | Peak Output Current | ( I_O ) peak | 8 | A | | Power Dissipation (Each Channel) | ( P_D ) | 60 | W | | Junction Temperature | ( T_j ) | 150 | °C | | Operating Substrate Temperature | ( T_c ) | 125 | °C |
The STK412-530 is a thin-form, hybrid integrated circuit (HIC) designed for high-fidelity audio power amplification. It is part of the STK410-530 series, known for low distortion and compact assembly suitable for mid-range stereo receivers, powered speakers, and mini-component systems.