Electronics > Beginners

Long Transistor leads

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MapleLeaf:
I have a few old-new stock transistors, JAN2n718a, that have very long leads.
Why the long leads?  For point to point wiring?
And why does it come in a plastic tube? As far as I can tell, these are not special transistors.

These came from a company that does military and commercial air craft.
The picture also shows a plastic pn2222 transistor for comparison.

tkamiya:
Maybe that particular transistor had a certain application where that was necessary?  Surely not all transistors came with that long a lead.  Having it come in a tube tells me it was hand-selected as part of the process. 

Having said that, I'm from Japan and I recall germanium transistors in 80s that we had, had far longer lead than what we get on 2n2222.  But not THAT long.

MK14:
With older stuff, PCBs were not always available or used.
E.g. Tag Strip construction.
So, non-PCBs, sometimes needed the very long leads.

Example picture:

T3sl4co1l:
Mil hardware was often point-to-point or spot welded.  I'm sure there's a spec somewhere for component lead length.

Tim

Seekonk:
Years ago they also made a big deal out of soldering heat reaching the transistor and damaging it. You were supposed to grab onto the lead with a pliers to stop the heat.  Lead length allowed that to happen.  Probably some truth to that way back when. Now we toast the crap out of them.

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