Switch Mode Transformers

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E series

The conventional E cores transformers whith rectangular center leg are avaliable in a wide variety sizes. Winding usually is placed in the center leg, whose section area is twice that of the each individual outer leg. Are particularly suitable for power applications.

Core type	A	B	C	D	E	Power (W) vs Frequency at 100KHz
E13	12.8 mm	14.6 mm	11.0 mm	2.5 mm	10.0 mm	-
E16	13.5 mm	16.15 mm	13.45 mm	-	-	-
E20	20.0 mm	20.8 mm	15.2 mm	-	-	-
E25	25.0 mm	25.1 mm	19.1 mm	5.0 mm	20.0 mm	-
E55	37.4 mm	52.0 mm	44.2 mm	5.0 mm	40.0 mm	-
E30	24.1 mm	29.2 mm	21.0 mm	5.08 mm	25.4 mm	-
E42	34.0 mm	48.7 mm	39.8 mm	5.0 mm	35.0 mm	-

EP series

Widely used in power inductor core, choke coil core, EMI filter core,etc. The EP core has a round center leg to minimize winding loses. Shielding is exelent due to his pot core feature. EP cores transformed are used for compact transformer designs with high inductance and hight economy of space.

Core type	A	B	C	D	E	Power (W) vs Frequency at 100KHz
EP07	10.7 mm	8.5 mm	10.5 mm	2.54 mm	5.08 mm	-
EP20	25.1 mm	21.9 mm	19.15 mm	5.08 mm	17.78 mm	-
EP17	19.2 mm	19.2 mm	15.5 mm	5.0 mm	15.0 mm	-
EP13	13.6 mm	13.6 mm	12.7 mm	2.54 mm	10.16 mm	-
EP10	12.4 mm	11.2 mm	12.0 mm	2.54 mm	7.62 mm	-

ETD series

Economical Transformer Design. Especially designed for a power applications in a switch mode power supply, with a constant cross section along the magnetic path, his round center leg makes easy the winding specially the thick wires. Avaliable in a wide range of sizes and vertical or horizontal mounting positions.

Core type	A	B	C	D	E	Power (W) vs Frequency at 100KHz
ETD29	35.2 mm	25.2 mm	25.4 mm	25.4 mm	5.08 mm	-
ETD34	39.6 mm	42.8 mm	32.9 mm	25.4 mm	5.08 mm	-
ETD39	44.6 mm	47.8 mm	36.1 mm	30.48 mm	5.08 mm	-
ETD44	49.6 mm	52.2 mm	38.1 mm	35.56 mm	5.08 mm	-
ETD49	54.5 mm	57.2 mm	40.6 mm	40.64 mm	5.08 mm	-