Block N87 EFD 20 Transformer Ferrite Core, 1200nH, For Use With Choke Converter Topologies, Transmitter

FS-1EFD series size 13/7/4 ferrite transformer cores made from N87. These EFD low profile type ferrite transformer cores are available with air gaps inserted:
Stock number 840-7480 has a 0.1mm gap
Stock number 840-7563 has a 0.2mm gap
Stock number 840-7561 has a 0.5mm gap
Stock number 840-7733 has a 1.0mm gap
Typical applications for these ferrite cores include transformers and inductors in switch mode power supplies
For bobbins see stock numbers 840-7317 and 840-7311

Transformer Ferrite Kits - Cores

The A_L value in the table applies to a core set consisting of two cores without air gap Cores ETD conform to IEC 51(CO)276