Re: 2n3819 Mosfet
Yes, transistors by convention are drawn with pins facing upwards, but IC's with their pins facing downwards. The Vishay drawing is against convention!
The diagrams are actually opposite to each other, but the 2N3819 is a symmetric device, so source and drain can be interchanged. Some samples may work better one way round, some the other, in a particular circuit - but in manufacture, the geometry does not differentiate between source and drain.
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