Hi Andres,

I got worse info from AiT:

U15: A7117E6R-50

no stock available now.
 
U12: A7108E5R-12
U11: A7108E5R-33

no fixed voltage output version available in Taipei warehouse, the lead/time may need 4 ~ 8 weeks.
 
U10: A7131J10VR


phased out now.

So you were right, please use other parts which can be easily get in Digi-Key or Mouser firstly.
Thanks,
Adam