Creteria:
smallest package meeting required performance

12V to +-6V filters:
input:
IDCP-1813-NB-180-M from vishay
output:
IDCP-1813-NB-330-M from Vishay

12V to +3.3V filters:
intput:
IDCP-1813-NB-180-M from vishay
output:
IHLP-2525CZ-RZ-3R3-M-01 from vishay

12V to +3.3V switch:
IHLP-2525CZ-RZ-8R2-M-01 from vishay

48V to +12V switch:
IHLP-5050FD-RZ-8R2-M-01 from vishay

48V to +12V filter:
input:
IDCP-1813-NB-180-M from vishay
output:
IHLP-5050CE-RZ-3R3-M-01 from vishay