STK4152II Stereo Amplifier IC

The STK4152II (STK4152-2) is a 30-watts per channel stereo power amplifier (thick-film hybrid IC) manufactured by the Sanyo Corporation. This IC requires a split-rail power supply with +Vcc on pins 11 and 12, and –Vcc on pins 9 and 14. The absolute maximum power supply voltage rating is ±42 V and the recommended power supply is ±27.5 V. The STK4102II series and STK4101V series are pin-compatible with this IC.

Apart from the obvious input/output and power supply pins, the block diagram shows that pins 9, 8, and 7 relate to the muting function. Pins 4 and 3 relate to the current stabiliser. Interestingly, this IC contains a differential input feeding a voltage amplifier.

A faulty IC can be identified my measuring the DC voltage on the audio output pins 10, and 13. On a good IC there are usually no (or negligible) DC voltages; however a faulty IC will exhibit large DC swings.

Price/eBay

The price of this IC can vary considerable depending upon where you purchase it from. The cheapest ones tend to come from China, however these are often fake or faulty. Here are some photographs of a genuine IC. You can also see the inside electronic engineering of this IC in the following pages of this article. These photographs may be useful for comparison purposes if you are in the market to buy a replacement and need to know if what you are buying is genuine or fake.

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