Transformers transfer electrical energy between two or more circuits through the magnetic field. HIGH REL Transformers from many manufacturers are in doEEEt
HIGH RELIABILITY and SPACE Power Inductors listed in doEEEt, are a passive two-terminal electrical component that stores electrical energy in a magnetic field
COMMON MODE CHOKES Common mode chokes allow that common mode current creates a magnetic field that opposes any increase in common mode current, many HI REL are listed in doEEET