EFD

TDK (Epcos) offers 5 standard EFD (Economic Flat Transformer Design) core shapes made of power ferrite materials N87, N97, N49. An advantage of EFD-core is the possibility to design low-profile compact transformers using traditional ordinary machine winding based on this core shape. Low height of ready-made transformers and chokes provides a good mechanical stability of winding products based on EFD-cores. IT gives a possibility of their usage in the assembly together with coil formers for surface mounting.

Available EFD-cores and accessories in stock on order

EFD-cores dimensions

efd dim.png

Standard Size	A [mm]	B [mm]	C [mm]	D [mm]	h1 [mm]	h2 [mm]	E [mm]	PDF
EFD 10/5/3	10,5^±0,3	2,7^±0,1	7,65^±0,25	4,55^±0,15	5,2^±0,1	3,75^±0,15	1,45^±0,05
EFD 15/8/5	15,0^±0,4	4,65^±0,15	11,0^±0,35	5,3^±0,15	7,5^±0,15	5,5^±0,2	2,4^±0,1
EFD 20/10/7	20,0^±0,55	6,65^±0,15	15,4^±^0,5	8,9^±0,2	10,0^±0,15	7,7^±0,25	3,6^±0,15
EFD 25/13/9	25,0^±0,65	9,1^±0,2	18,7^±0,6	11,4^±0,2	12,5^±0,15	9,3^±0,25	5,2^±0,15
EFD 30/15/9	30,0^±0,8	9,1^±0,2	22,4^±0,75	14,6^±0,25	15,0^±0,15	11,2^±0,3	4,9^±0,15

Example of an assembly set EFD 30/15/9

Information for Ordering

These cores are supplied as single units.
Gapped EFD cores are supplied with toleranced A_L value as specified in the data sheets. The A_L value applies to a core set comprising one ungapped core (dimension g = 0) and one gapped core (dimension g > 0).

Example of EPCOS ordering code structure:

N87 EFD15/8/5 A_L=160nH B66413U0160L187
B66413 — Part number
U0160 — A_Lvalue in nH (A_L=160 nH) given only for gapped cores. Not specified for ungapped cores
L — А_L (±15% for letter "L") tolerance
87 - material N87

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