Soren Juel Andersen wrote:

> I agree with Jeff.
>
> If you support the EBC, AK system, how many pin does a package need to have
> before you switch to
> numbers?
> What about 3 pin regulators, FET's  with 2 gates and so on.
> Nobody would dream of using labels on a 7400, you do not a hundred
> different DIP14 footprint.

Of course.  Any package which has standard pin numbers assigned to
a specific device type (7400 TTL, etc.) are fine.  There is just a bit of
a gray area, as some chips have different pinouts in different packages
(ie. Motorola ECL in DIP16 or PLCC20).  But, as long as you put both the
part suffix that denots package type (ie. P or F in previous example)
and the footprint in the schematic, there should be no problem.
Where it becomes a problem is in parts not so rigidly defined.
What is pin # 1 on a DO-47 diode?  There IS no pin #1 on a diode,
so the manufacturer can't give you this info.  Also, you can buy
2N2222 transistors from a bunch of companies, and the part number
does not define the package type with complete reliability.

Jon


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