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Thread: OK to operate at the absolute max rating?
face picon face BY : email (remove spam text)(Olin Lathrop)

Tomás Ó hÉilidhe wrote:
> Can you suggest a good driver chip? Initially I used a ULN2003, but it
> turned out to have too great a voltage drop inside it. Same situation
> with the UDN2981.

Why does it have to be a chip?  Why not a bunch of MMBT4401/4003 or whatever
your favorite jellybean NPN/PNP transistors are?

You also keep ignoring two problems that make this discussion of whether you
can draw 20mA from a PIC pin irrelevant.  First 20mA isn't even remotely
close to what you need.  Second without some voltage or current regulation
somewhere, the LED brightness will vary hugely over the battery voltage

Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
<017f01c8e67a$67bff0d0$0300a8c0@main> quoted-printable

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Subject (change) OK to operate at the absolute max rating?

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