Electronics > Beginners
Long Transistor leads
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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