The best replacement for bec is ubec.

The best alternatives to bec are rated as following:
★★★★★  ubec
★★★  voltage regulator
★★★  sbec
★★★  opto
★★★  reg
★★★  no bec
★★  esc
★★  bulats
★★  glitch buster
★★  bec
★★  reg harder
★  cec
★  cae
★  aud
  switching bec
  ubec esc
  separate bec
  sedp

Your alternative for bec is not listed? Suggest!
Speaking about bec, one probably shouldn't forget about esc.

Other search terms related to bec and their ratings are:
★★★★★ esc
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Google Trends

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bec
ubec
voltage regulator