How does Plastic-Encapsulate Transistors work?

[circuit12]

Good day,all. I am currently working an project which need to use the plastic-encapsulate transistor.
Here I am planning to use BCX51-10. And I google this part to find its related information. Here it is:
Description

FEATURES
? IC = -1A Continuous Collector Current
? Low Saturation Voltage VCE(sat) < -500mV @ -0.5A
? Epitaxial Planar Die Construction
? Complementary NPN types: BCX54, 55, and 56

The information about this part is less,who can tell me how to use it?

 

[Harald Kapp]

The information about this part is less

Get a decent datasheet. Information on a marketplace as the one you linked to is usually marginal if not entirely useless.

who can tell me how to use it?

You use it as any PNP transistor as long as the parameters match,

Why are you looking for a component first and then how to use it? That's not the usual way a circuit is designed. Normally you design a circuit that fulfills your requirements and then select the suitable components.

 

[FuZZ1L0G1C]

Salvaged component?....