S8550 PDF Datasheet – 40V, 0.5A, PNP Transistor

This post describes for the PNP transistor.

The Part Number is S8550.

The function of this semiconductor is -40V, -0.5A, PNP Transistor.

The package is TO-92 Type

The manufacturer of this part is Wing Shing Computer Components.

See the preview image and the PDF file for more information.

1 page
S8550 datasheet pinout


The S8550 is a low voltage high current small signal PNP transistor, designed for Class B push-pull audio amplifier and general purpose applications.

A PNP transistor is a type of bipolar junction transistor (BJT) with a different structure and polarity compared to an NPN transistor.

Here are three characteristics of PNP transistors:

1. Polarity
: In a PNP transistor, the majority charge carriers are holes, which flow from the emitter to the collector. The emitter is negative relative to the base, and the collector is positive relative to the base.

2. Current flow
: When a small current is applied to the base terminal, it allows a much larger current to flow from the emitter to the collector. This is called amplification or gain, and it makes the PNP transistor useful as an electronic switch or amplifier.

3. Voltage levels
: The voltage levels in a PNP transistor are opposite to those in an NPN transistor. In a NPN transistor, the base-emitter junction is forward-biased and the collector-base junction is reverse-biased.


S8550 transistor


1. Power dissipation PCM : 0.625 W(Tamb=25℃)

2. Collector current ICM : 0.5 A

3. Collector-base voltage V(BR)CBO : 40 V


S8550 Datasheet PDF

S8550 pdf


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