U, I, Block Cores

TDK (Epcos) produces 8 standard sizes of U cores of rectangular cross section and I cores made from power ferrite brands N27, N87, N97, N95. Owing to their high saturation flux density, high Curie temperature and low dissipation losses, they are suitable for power, pulse and high-voltage transformers. UU and UI cores are preferred for power ratings, since they can be combined in various ways (see illustration below) to produce transformers in the kilowatt range.

UI config.png

Figure 1: The designing of a powerful core based on U- and I- core shapes combination.

Figure 2: The designing of a powerful E- core based on U-cores combination.

Figure 3: The designing of a powerful core based on U-cores combination.

Available U,I-cores in stock and on order

U,I-cores Dimensions

Standard Size	a [mm]	b [mm]	c [mm]	d [mm]	e [mm]	f [mm]	PDF
U 93/76/16	93,0^±1,8	76,0^±0,5	16,0^±0,5	48,0^±0,9	34,6 min	28,0^±0,5
I 93/28/16	93,0^±1,8		16,0^±0,5			28,0^±0,5
U 93/76/20	93,0^±1,8	76,0^±0,5	20,0^±0,5	48,0^±0,9	34,6 min	28,0^±0,5
I 93/28/20	93,0^±1,8		20,0^±0,5			28,0^±0,5
U 93/76/30	93,0^±1,8	76,0^±0,5	30,0^±0,6	48,0^±0,9	34,6 min	28,0^±0,5
I 93/28/30	93,0^±1,8		30,0^±0,5			28,0^±0,5
U 101/76/30	101,0^±1,8	76,0^±0,5	30,0^±0,6	48,0^±0,9	44,0 min	28,0^±0,5
U 126/91/20	126,0^±4,0	91,0^±1,0	20,0^±0,6	63,0^±2,0	70,0^±2,0	28,0^±1,0
I 126/28/20	126,0^±4,0		20,0^±0,⁶			28,0^±1,0
U 141/78/30	141,0^±5,0	78,0^±0,5	30,0^±1,0	33,5^±1,0	50,0 min
I 100/30/19	100,0^±1,5		30,0^±0,5			19,0^±0,2

UR Ferrite Cores

UR dim.png

Standard Size	A [mm]	B [mm]	C [mm]	D [mm]	E [mm]	F [mm]	PDF
UR 114/78/38	114,0^±2,0	78,0^-1,0	38,0^-1,0	48,0^+0,6	38,0^-1,0	30,0^-0,8

Information for Ordering

These cores are supplied as single units.

Example of EPCOS ordering code structure:

N87 U126/91/20 B67385G0000X187
B67385 — Part number (U cores)
U126/91/20 — U-core shape
87 — material N87

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