If you have looked on inside of english electronics, you have seen most of these funs (how dare I). Honestly, there are situations when your engineering pride got to be overrun . Say that you have a waiting customer who wants the equipment next week, and the transistor supplier tells you that the exact package you want can't be fixed earlier than six weeks. Then, what do you do? The best possible without sacrifying good function. Listen to this. We have a high frequency minature unit, that can't work with even shortest bond wire. So, what to do? The RF engineer found that you could perhaps mount one chip upon the other. The production people protested. Insane. But we had to try. We now mount a 250um wide chip upon a 700um chip with such a precision, that there is also space for a wire bond! I dislike the 'design', but can't stop the production for weeks or months to find the goodlooking solution. J-STD..? Uh.....erh..
Cura posterior.
Ingemar Hernefjord
Ericsson Microwave Systems

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bissonnette,
Jean-Francois
Sent: den 18 februari 2005 16:25
To: [log in to unmask]
Subject: [TN] Flipped transistor?


Here is a first for me!

Before I go ruffling some feathers I would like to have others opinion.  I've just been informed of a modification on a boards that requires to install a SOT23 NPN transistor to be fliped on its back in order to be soldered.  The poor leads are then bent backward to contact with the board's lands of some other component.

Engineering did not raise a flag on that yet... I'm worried to say the least because I'm convinced that this is a NO NO!  

Anyone has seen that in the past?

Thanks!

Jean-François

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