SOT-23 TL431 pinouts

[Richard Head]

I use TL431's in a SOT-23 package fairly regularly and have come across a pinouts problem.
The TL431's I receive from a certain supplier have the TL432 pinouts but are marked as a TL431.
I wonder if anyone else has come across this problem before?

Dick 

[Whales]

Incorrectly marked electronics are common, mainly intentionally rather than accidentally.  A large part of the fab industry is to duplicate popular or expensive chips -- whether or not they are labelled as such varies.

This isn't always a bad thing (as it lowers your costs), until you find a part that does not behave as you expected.  Regardless of whether or not you trust your supplier, they themselves can be duped (or it could be a honest mistake).  Make sure you test your part before redesigning a schematic (and get in contact with your supplier if you think they are reputable enough to care ).

How many are you using?  Hack: could you just manually bend the leads the other way and mount them upside-down?

[Richard Head]

It's for production, which will be ongoing for several years. It's an industrial product so it's lifetime should be quite long.
I only use one on each unit but it has to be correct as it's machine assembled.

[nickm]

Did you get the TLV431 by mistake?  They will have the two flipped pins like the TL432.

[theatrus]

It's for production, which will be ongoing for several years. It's an industrial product so it's lifetime should be quite long.
I only use one on each unit but it has to be correct as it's machine assembled.

Find a better supplier if they don't make this right.

I have received wrong parts from even DigiKey, so stuff happens. Depending on your needs you can screen for this in your assembly process.

[Richard Head]

The marking on the package is exactly as you would expect for a TL431 so I don't think its a TLV431. I don't buy a reel, only 100 pieces at a time so I can't confirm what they actually are.
I have been assured by the supplier that the packaging says TL431.
I've been ordering them from another supplier until this issue is sorted out.
Thanks for the feedback. Much appreciated.

Dick