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Subject: Package problem

Date: 06/18/02 at 7:10 AM
Posted by: Miguel AB Silva
E-mail: miguel.silva@geonav.pt
Message Posted:

Hi all,
in the project I'm working in I am using an NPN transistor for swithcing purposes which has an SOT-23 package. It is used to drive a LED from a microcontroler port. The problem is that the printed circuit boards we've made came out with a footprint like:
E C
|| instead of ||
|| || || ||
C B B E
as result of my pure distraction :-(

As I realized the PCBs were made, the SOT-23 footprint on the left is not very standard (if it even exists...) as opposed to the very standard footprint on the right.
As a solution, I could rotate a standard transistor so it matches the nonstandard footprint. The problem is that this is not convenient for mass production.

Has anyone had this problem before and wants to share any comments on how I can get a transistor with the a SOT-23 package with a pinout compatible to the draw on the left ?

Until now, I've searched at Fairchild, Phillips semiconductor, ON semiconductor, Zetex, but no success so far.
The transistor is a typical general purpose, NPN, low sat. voltage, average gain.

Sorry about any english mistakes.

Thanks in advance,
Miguel


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