HISTORY (Story time!)
Sustainability is the name of the game! Anything (that has been tested and still functioning properly) should be repurposed creating saving in wasted Ee and reducing the poisoning our environment when items are buried in the earth at the local tip needlessly.
Never heard of Ee? It is a concept that creates a measurement of ALL things (not just electronics) that humans have made and the energy used in obtaining the raw material, processing the materials right through to a finished product and even should include the shipping of the item to the distributors/retailers.
If you would like to know more about Ee values, please take a look HERE
I have been in the electronics game for a long long time and enjoy it immensely ... during my time I come across a lot of 'interesting' pieces of gear and if considered to have obsolete functionality or it is just plain old non-functional, I take out the interesting parts.
Over the years I have collected and stored a lot of these parts, many were not properly documented and this is one of them!
Cute little Black 'dot' transistor with Gold plated legs from a ..... (that's the lack of documentation which I began in the 1990's so these are pre-1990's)
I have absolutely no idea what the original equipment was but probably a major manufacturer, most likely to be US based and with a function in the area of industrial control or test equipment (I delved a lot into Agilent, HP, IBM and many others in those days)
The body looks to be a resin, not metal or plastic and the shape is unusual too - round but with a flat across all of one side but only half the height.
Their original function? NI (No Idea) but definitely small signal and probably switching or less probable, audio frequency or perhaps both!
Enough of the introduction, down to the details ...
UNIDENTIFIED MANUFACTURER - Small Transistor (VERY small)
Black 'dot' is the head measuring 4mm diameter x 3mm height
Gold plated legs
ALL devices in this Hfe grouping have a part number printed on one side (in White) beginning with 693 then there are slight variations with a two letter suffix e.g FO/FB or FS
My current semiconductor test equipment is rudimentary but it does tell me these things ...
These are NPN Silicon BJT's
Hfe is high, with a measured range (I painstakingly tested every device) 277 ~ 418 with the majority of devices sitting around 320
I have not the foggiest idea what a 693 is, Oh! for a wonderful piece of gear like the HP4155 to take a much closer look at the transistor characteristics (i never had one but now wish I did!)
Never seen one? Just drool over this ...
So there is not a lot else to tell, they work but ...
COSMETIC CONDITION
USED
Clean
Yes, these are 'pulls' from a board but the legs are straight(ish) and no weakness at the body.
Being very small (smaller than a typical BCxxx device) I have again repacked them into a sealed clear plastic packet
These are offered individually or an auto discount applies if buying them all
