[sdiy] Why transistors arent square!

[karl dalen]

>IngoDebus said

> > They have to make them like that so that sdiy'ers
> know which
> > way to put them on the PCB........Ouch !!! (I'll
> duck now shall I ?)
 
> Joking aside, I think this is indeed one possible reason.
> If transistors were in a square package, with three leads in
> the middle of the package in a line, they'd at least
> need some marking. Much like DIL ICs.
> BTW, there are/were some transistors in a square-ish
> package. Was that Ferranti?

Well, there are a serious argument against that,
the SMT are an older technique then TH's!

Square components are very old, for long time 90 deg
cornes on silicon was the only technique available.

>I often wondered why DIL packages are the way they are. If
>there was on one side one lead more than on the other side,
>it would be impossible to insert them the wrong way. Tubes,
>on the other hand, can never be inserted wrongly. At least
>I don't know of any tube sockets that allow for that.

Bad floorplaning are one cause, bad initial chip design are
one cause! Standardisation another, conservative management
yet another!

KD


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