Hi,

I found an IR Audio transmitter circuit which uses S8090 NPN transistor. But I cant find a proper datasheet or equivalent for it. Can anyone help?

I have double checked the IC name and tried googling for the datasheet got few but they were irrelevant

 

Characteristics of the transistor SS8050
Structure - n-p-n
Collector-emitter voltage, not more than: 25 V
Collector-base voltage, not more: 40 V
Emitter-base voltage, not more than: 6 V
Collector current, not more than: 1.5 A
Dissipated collector power, not more than: 1 W
Current transistor gain (hfe): from 85 to 300
Boundary frequency of the current transfer coefficient: 100 MHz
Case: TO-92
Classification by hFE
Transistors series SS8050 are divided into several groups by the gain factor. The SS8050B transistor has a gain range of 85 to 160, the SS8050C is in the range of 120 to 200, and the SS8050D is in the range of 160 to 300.
Complementary pair
The complementary pair for the SS8050 is the SS8550 transistor with a p-n-p structure.
Analogues
The SS8050 transistor can be replaced with MPS650, MPS650G, MPS651, MPS651G, MPS8050

 

Characteristics of the transistor SS8050
Structure - n-p-n
Collector-emitter voltage, not more than: 25 V
Collector-base voltage, not more: 40 V
Emitter-base voltage, not more than: 6 V
Collector current, not more than: 1.5 A
Dissipated collector power, not more than: 1 W
Current transistor gain (hfe): from 85 to 300
Boundary frequency of the current transfer coefficient: 100 MHz
Case: TO-92
Classification by hFE
Transistors series SS8050 are divided into several groups by the gain factor. The SS8050B transistor has a gain range of 85 to 160, the SS8050C is in the range of 120 to 200, and the SS8050D is in the range of 160 to 300.
Complementary pair
The complementary pair for the SS8050 is the SS8550 transistor with a p-n-p structure.
Analogues
The SS8050 transistor can be replaced with MPS650, MPS650G, MPS651, MPS651G, MPS8050

 

Thanks bordodyno,
That proves helpful...

But, just out of curiosity!! Where did you manage to find those details?

 

I found it in Russian (radio amateur site). I just took advantage of Google translator.
http://www.radiolibrary.ru/reference/transistor-imp/ss8050.html
http://www.radiolibrary.ru/reference/transistor-imp.html

 

Characteristics of the transistor SS8050

Is this the same as the S8090 that TS asked about?

 

As I recall, Fairchild made some transistors with part numbers like that several decades ago. I also have vague memories of a circuit or two for IR audio transmission from about the same time, probably published in Radio Electronics or Popular Electronics.

Can you post the schematic or a link to it? Chances are there are lots of modern, easily obtained transistors that will work perfectly well. If it is an old circuit, there are also likely to be better IR emitters and detectors available.