What is the difference between vertical PNP and lateral PNP

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xiexi

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vertical pnp

And about vertical PNP there are two kinds, one is U type collector pickup, the other is line type collector pickup, I also can't catch their difference, pls give some instruction , thx.
 

lateral pnp vertical

This actually goes back to the pre-1970 era with its 1 MHz gain-bandwidth product op amp limit. Back then the masking step used contact masks which produced low yields. The extra diffusions to produce a vertical PNP would have reduced the yield to unacceptably low values. Also back then the lateral dimensions were around ten microns.
 

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