Get your Identifying hats on guys!

Hi to all,

Can anyone identify the part pictured below, just acquired a load of these and apart from thinking they are some kind of optic device I am stumped.

Thought at first they were phototransistors until I discovered that PTs seem to have only 2 legs ( the gate being light! ) at least those I can find pics of on the web anyway.

So have a good look at the pics and feel free to ask any questions and hopefully give me some answers

BTW there are NO markings on these at all and they are about the size of a small transistor, say the 2n2222, but these cases are gold coloured, its not the camera making them look gold.

Thanks in advance guys and enjoy the challenge...........Al

They are cool looking!

I don't know what they are though..... I'll be interested to see if somone knows

hi,
Look here:
https://www.electro-tech-online.com/custompdfs/2007/10/phototransistor-ired20data20book.pdf

It looks like a 'lensed phototransistor' type VTT1115

Use your ohm meter on the pins, it should be possible to figure it out.

BTW, many P/T's do have 3 legs!, the base is brought out for possible biasing.

Thanks Eric

ericgibbs said:

hi,
Look here:
https://www.electro-tech-online.com/custompdfs/2007/10/phototransistor-ired20data20book-1.pdf

It looks like a 'lensed phototransistor' type VTT1115

Use your ohm meter on the pins, it should be possible to figure it out.

BTW, many P/T's do have 3 legs!, the base is brought out for possible biasing.

Click to expand...

Thanks Eric, spot on with the diagnosis, I just tried one in a small circuit and they perform exactly as you suggest, very sensitive too! So if your'e ever stuck for a few let me know..............Al

bigal_scorpio said:

Thanks Eric, spot on with the diagnosis, I just tried one in a small circuit and they perform exactly as you suggest, very sensitive too! So if your'e ever stuck for a few let me know..............Al

Click to expand...

Next time I visit my folks in Rotherham, I'll pick a couple up.