Help identify unknown component

[Aan]

Hi,

I need help to indentify an unknown component, the component i have
the first letter is blur and it's hard to read, the others letter is
easy to read, the letter is XS08A, where X letter is blur.

Please see the picture..

 

[hotwaterwizard2]

Could this be it?
BS08 Silicon Bilateral Switch
The full Datasheet is below.
CLICK HERE

BS08.pdf

 

[Aan]

Hi hotwaterwizard,

When point A is connected to ground why is the SBS switch on ? instead when point A is connected to VCC ?
And why is the SBS latch, when point A is bring back to VCC ?

Thanks.

 

[Kasamiko]

Don't we have a DEAD-SHORT when SBS conduct?

 

[Aan]

Hi Kamasiko,

What do you mean ?

 

[hotwaterwizard2]

Well I looked at the Datasheet that I provided and here is what the Equivelent circuit looks like. It is not a dead short! It looks like the circuit switches the positive and negitive output.

View attachment 39141

View attachment 39142

View attachment 39143

 

[Aan]

So this device is a SBS semiconductor ? Thanks.

 

[audioguru2]

So this device is a SBS semiconductor?

Yes. It is also called a Triac.

 

[Aan]

Hi all, i still don't understand how SBS works..can you explain to me the characteristic of SBS ?

 

[audioguru2]

This SBS is spec'd to conduct when the voltage across it rises to 8V without a gate signal, and less voltage with a gate signal.

The PNP transistor has a small leakage current that is amplified by the NPN transistor. Then the current of the NPN transistor is amplified by the PNP transistor and the vicious circle continues and both transistors are conducting. When the current drops below 0.4mA when the AC power source passes through 0V then it stops conducting.

 

[Aan]

Thanks All.