Block N87 Transformer Core, 3500nH, For Use With Choke Converter Topologies, Transmitter

FS-1ETD series size 44/22/15 ferrite transformer cores made from N87 with a cylindrical centre leg. These ETD ferrite cores are available with air gaps inserted:
Stock number 840-7421 has a 0.1mm gap
Stock number 840-7503 has a 0.2mm gap
Stock number 840-7585 has a 0.5mm gap
Stock number 840-7673 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 840-7351 and 840-7355

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