Does a SOT-23 (1,2,3) = BCE PNP exist?

[741]

See picture 

[Benta]

Must be some very British humourous thing for insiders posted at the pub.
What's your point?

[Someone]

Must be some very British humourous thing for insiders posted at the pub.
What's your point?

Probably built some boards with the "wrong" pinout. There are/were specialty suppliers who deal with this, but dont have their names on hand (and unlikely to be cheap enough to match this forums demographics).

[ledtester]

You're not the only person who has looked for such a part:

- http://dangerousprototypes.com/forum/index.php?topic=3914.0

- https://forum.robodoupe.cz/viewtopic.php?t=954 (in Czech)

There is a EE Stackexchange question which discusses the same problem for an NPN. One idea is to flip and rotate the part 120 degrees:

https://electronics.stackexchange.com/a/493607/



but also see the other proposed solution.

[741]

Hi

No, it was not anything humorous - not intentionally that is.

I have a footprint with the 'wrong' 1,2,3 pin sequence. I am pretty sure this stems from at least one data-sheet which showed pins 1,2,3 like this
1
---2
3

Thus, initially I designed SOT-23 footprints to that convention. I later realised that SOT-23 obviously includes SOT-23(6) which must follow the normal anti-clockwise pin convention.

Anyway I'm resigned to a re-design, although I'd like to get one PCB made up as-is so as to test the circuit.

[I wanted a rude username]

When a related question was asked previously, Mike of Mike's Electric Stuff suggested the following:

> It's not hard to bend the leads to mount SOT23's upside down - just need a couple of spiky implements - one to hold the body down, the other to push the leads down flat - reflows no problem

Perhaps that will get you over the line on your prototype at least?

[Kleinstein]

There are some SMD parts that come with alternative pin_outs.  However with transistors there is usually just the option to rotate - so no real need for a different pinout.
Usually pin 3 (the single pin on one side) is the substrate and thus the collector of BJTs and the gate of JFETs.

[SiliconWizard]

For just one prototype just mount the part appropriately as suggested above. No big deal.
And yes testing the board before redesigning it is a good idea. It may not be the only problem you'll have to solve.

[Doctorandus_P]

You should always be careful with SOT23.
A problem with this package is that there is no universal consensus of what the location of pin 1 is. (Although alternative pin numbering seems to be become less common).

[bostonman]

Why not cut the traces and run jumper leads?

Or as suggested, mount upside down; you can use solid bus wire and don't need to stress the leads by bending them.