[SOLVED] how to determine opto switch pins

[vvarlord]

i've bought a opto switch and, what's written on it is this:
"
kt 3162
8731
mexico
"
i've searched alot on the internet to find a datasheet but didn't find any.
any body knows a way to determine which pins are for the diode and which for the phototransistor?
tnx in advance.

 

[keith1200rs]

Are there any markings either on the top or near the leads? Letters such as E and S for example.

Keith

 

[FvM]

I guess, it might be a MOC3161 (optotriac with zero crossing control) equivalent.

But if it's a phototransistor though, most have an industry standard pinout, you can refer to similar types. The LED can be easily identified with a multimeter (in diode voltage range), also the base pin of the optocoupler if connected to a pin.

 

[vvarlord]

there's no marking on it
i just tried with diffrent orientations and found the right one
tnx for your replys

 

[FvM]

In case of doubt, the text orientation defines the pin 1 position (lower left corner).

 

[vvarlord]

yes , when i put the device in the right orientation which the text is read,the emmiter pin was the lower left corner
in all the datasheets a i saw for other models the emmiter pin is no. 1
tnx