STK433-870-E PDF – 4-channel, AB Audio Power IC

This post explains for the Audio Power IC.

The Part Number is STK433-870-E.

The function of this semiconductor is 60W x 4-channel class AB audio power IC.

The package is ZIP 23 Pin Type

Manufacturer: Sanyo

Preview images :

STK433-870-E pdf


The STK433-870-E is 60W×4 channels class-AB audio frequency power amplifier hybrid IC.

A Class AB audio power IC refers to an integrated circuit (IC) that is designed to amplify audio signals in a Class AB amplifier configuration. Class AB amplifiers are commonly used in audio applications where a balance is sought between efficiency and audio quality.

In a Class AB amplifier, the output stage consists of two active devices: a pair of complementary transistors, usually one NPN and one PNP transistor. These transistors work together to amplify the audio signal. The Class AB configuration combines features of both Class A and Class B amplifiers to provide better efficiency and reduced distortion.

The Class AB amplifier operates in such a way that one transistor conducts the positive half of the audio signal waveform, while the other transistor conducts the negative half. This allows for improved efficiency compared to a pure Class A amplifier, as both transistors are not conducting simultaneously, reducing power dissipation. However, since there is a small overlap in the conduction regions of the transistors, it helps to minimize the crossover distortion that can be present in pure Class B amplifiers.


• Pin-to-pin compatible outputs ranging from 60W to 80W

• Can be used to replace the STK433-000/-100 series (30W to 150W/2ch/class-AB), STK415-100Series (80W to 150W/2ch/class H) due to its pin compatibility of ch1/ch2.
(1) 2ch class AB (30W to 60W, THD=10%) : STK433-000 series
(2) 2ch class AB (80W to 150W, THD=10%) : STK433-100 series
(3) 2ch class H (80W to 150W, THD=10%) : STK415-100 series

• Compact package (64.0mm×31.1mm×9.0mm, 78.0mm×44.1mm×9.0mm)

• Output load impedance RL=6Ω, 8Ω supported.

• Allowable load shorted time: 0.3s

• Allows the use of predesigned applications for standby and mute circuits […]

STK433-870-E pinout datasheet

• Audio power amplifiers

STK433-870-E PDF Datasheet