Page 1
FERROXCUBE
DATA SHEET
E55/28/21
E cores and accessories
Supersedes data of September 2004 2008 Sep 01
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Ferroxcube
E cores and accessories E55/28/21
CORE SETS
Effective core parameters
SYMBOL PARAMETER VALUE UNIT
Σ(I/A) core factor (C1) 0.350 mm
V
e
I
e
A
e
A
min
effective volume 44000 mm
effective length 124 mm
effective area 353 mm
minimum area 345 mm
m mass of core half ≈ 108 g
handbook, halfpage
−1
3
2
2
R < 0.6
Dimensions in mm.
56.2
37.5
17.2
0
−2.1
+1.5
0
0
−0.5
CBW063
18.5
21.0
+0.8
R3
0
0
−0.8
27.5
±0.3
Fig.1 E55/28/21 core half.
Core halves
A
measured in combination with a non-gapped core half, clamping force for AL measurements 40 ±20 N, unless stated
L
otherwise.
A
GRADE
L
(nH)
3C81 100 ±5%
160 ±5%
250 ±5%
315 ±5%
400 ±8%
630 ±10%
(1)
(1)
(1)
(1)
(1)
(1)
µ
e
≈ 28 ≈ 8740 E55/28/21-3C81-E100
≈ 45 ≈ 4560 E55/28/21-3C81-E160
≈ 70 ≈ 2500 E55/28/21-3C81-E250
≈ 88 ≈ 1840 E55/28/21-3C81-E315
≈ 112 ≈ 1360 E55/28/21-3C81-E400
≈ 176 ≈ 780 E55/28/21-3C81-E630
TOTAL AIR GAP
(µm)
TYPE NUMBER
8625 ±25% ≈ 2410 ≈ 0 E55/28/21-3C81
3C90 100 ±5%
160 ±5%
250 ±5%
315 ±5%
400 ±8%
630 ±10%
(1)
(1)
(1)
(1)
(1)
(1)
≈ 28 ≈ 8740 E55/28/21-3C90-E100
≈ 45 ≈ 4560 E55/28/21-3C90-E160
≈ 70 ≈ 2500 E55/28/21-3C90-E250
≈ 88 ≈ 1840 E55/28/21-3C90-E315
≈ 112 ≈ 1360 E55/28/21-3C90-E400
≈ 176 ≈ 780 E55/28/21-3C90-E630
6300 ±25% ≈ 1760 ≈ 0 E55/28/21-3C90
3C91 8625 ±25% ≈ 2410 ≈ 0 E55/28/21-3C91
3C92 4700 ±25% ≈ 1310 ≈ 0 E55/28/21-3C92
3C94 6400 ±25% ≈ 1790 ≈ 0 E55/28/21-3C94
2008 Sep 01 435
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Ferroxcube
E cores and accessories E55/28/21
GRADE
A
L
(nH)
µ
e
TOTAL AIR GAP
(µm)
TYPE NUMBER
3C95 8625 ±25% ≈ 2410 ≈ 0 E55/28/21-3C95
3F3 100 ±5%
160 ±5%
250 ±5%
315 ±5%
400 ±8%
630 ±10%
(1)
(1)
(1)
(1)
(1)
(1)
≈ 28 ≈ 8740 E55/28/21-3F3-E100
≈ 45 ≈ 4560 E55/28/21-3F3-E160
≈ 70 ≈ 2500 E55/28/21-3F3-E250
≈ 88 ≈ 1840 E55/28/21-3F3-E315
≈ 112 ≈ 1360 E55/28/21-3F3-E400
≈ 176 ≈ 780 E55/28/21-3F3-E630
5700 ±25% ≈1590 ≈ 0 E55/28/21-3F3
Note
1. Measured in combination with an equal gapped core half.
Properties of core sets under power conditions
B (mT) at CORE LOSS (W) at
GRADE
H = 250 A/m;
f = 25 kHz;
T = 100 °C
f = 25 kHz;
ˆ
= 200 mT;
B
T = 100 °C
f=100kHz;
ˆ
= 100 mT;
B
T = 100 °C
f = 100 kHz;
ˆ
=200mT;
B
T=25°C
f = 100 kHz;
ˆ
= 200 mT;
B
T=100°C
f = 400 kHz;
ˆ
=50mT;
B
T = 100 °C
3C81 ≥320 ≤ 9.0 −− − −
3C90 ≥320 ≤ 4.8 ≤ 5.9 −−−
3C91 ≥320 −≤ 3.5
(1)
−≤ 20
(1)
−
3C92 ≥370 −≤ 3.8 −≤ 27 −
3C94 ≥320 −≤ 3.8 −≤ 27 −
3C95 ≥320 −−≤ 27.7 ≤ 26.4 −
3F3 ≥320 −≤ 5.6 −−≤ 10
Note
1. Measured at 60 °C.
2008 Sep 01 436
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Ferroxcube
E cores and accessories E55/28/21
COIL FORMERS
General data for E55/28/21 coil former without pins
PARAMETER SPECIFICATION
Coil former material polyamide (PA6.6), glass reinforced, flame retardant in accordance with
“UL 94-HB”; UL file number E41613(M)
Maximum operating temperature 130 °C, “IEC 60 085”, class B
3 ±0.1
(5×)
handbook, full pagewidth
1 ±0.1
Dimensions in mm.
0
20
−0.2
+0.2
17.6
0
24.2 ±0.2
0
37
−0.2
2 ±0.1
(6×)
5 ±0.1
+0.2
33.2
0
35.7 ±0.1
38.8 ±0.2
Fig.2 E55/28/21 coil former (E).
Winding data and area product for E55/28/21 coil former without pins (E)
21.7
+0.2
0
23.8
0
−0.2
43.5
CBW064
0
−0.2
NUMBER OF
SECTIONS
MINIMUM
WINDING
AREA
2
(mm
)
MINIMUM
WINDING
WIDTH
(mm)
AVERAGE
LENGTH OF
TURN
(mm)
AREA
PRODUCT
Ae x Aw
(mm4)
TYPE NUMBER
1 250 33.2 116 88250 CP-E55/28/21-1S
2008 Sep 01 437
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Ferroxcube
E cores and accessories E55/28/21
General data for E55/28/21 coil former without pins (A)
PARAMETER SPECIFICATION
Coil former material polyamide (PA6.6), glass reinforced, flame retardant in accordance with
“UL 94-HB”; UL file number E41938(M)
Maximum operating temperature 130 °C, “IEC 60 085”, class B
handbook, full pagewidth
Dimensions in mm.
42.15
max.
21.1
min.
36.6
19
16.9
37
33.7
Fig.3 E55/28/21 coil former (A).
Winding data and area product for E55/28/21 coil former without pins (A)
NUMBER OF
SECTIONS
MINIMUM
WINDING
AREA
2
(mm
)
NOMINAL
WINDING
WIDTH
(mm)
AVERAGE
LENGTH OF
TURN
(mm)
1 277 33.7 113 97800 CP-E55/28/21-1S-A
AREA
PRODUCT
Ae x Aw
(mm4)
CBW065
TYPE NUMBER
2008 Sep 01 438
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Ferroxcube
E cores and accessories E55/28/21
General data for 14-pins E55/28/21 coil former
PARAMETER SPECIFICATION
Coil former material polyamide (PA6.6), glass reinforced, flame retardant in accordance with
“UL 94-HB”; UL file number E41938(M)
Pin material copper-zinc alloy (CuZn), tin (Sn) plated
Maximum operating temperature 105 °C, “IEC 60 085”, class A
Resistance to soldering heat “IEC 60068-2-20”, Part 2, Test Tb, method 1B: 350 °C, 3.5 s
Solderability “IEC 60068-2-20”, Part 2, Test Ta, method 1: 235 °C, 2 s
handbook, full pagewidth
Dimensions in mm.
44.2
max.
7.4
min.
37.35 max.
17.45 min.
5
19.75
1.15
21.15
min.
CBW066
Fig.4 E55/28/21 coil former; 14-pins.
Winding data and area product for 14-pins E55/28/21 coil former
0.4
35.65 max.
33
40.15
43.95 max.
23.7
4.3 min.
NUMBER OF
SECTIONS
MINIMUM
WINDING
AREA
2
(mm
)
NOMINAL
WINDING
WIDTH
(mm)
AVERAGE
LENGTH OF
TURN
(mm)
AREA
PRODUCT
Ae x Aw
(mm4)
TYPE NUMBER
1 278 33 119 98100 CPH-E55/28/21-1S-14P-Z
2008 Sep 01 439
Page 7
Ferroxcube
E cores and accessories E55/28/21
MOUNTING PARTS GENERAL DATA FOR MOUNTING PARTS
ITEM REMARKS FIGURE TYPE NUMBER
Clasp steel, zinc (Zn) plated 5 CLA-E55/28/21
Spring steel, zinc (Zn) plated 6 SPR-E55/28/21
58.8 max.
handbook, full pagewidth
35 27.942123.5
Dimensions in mm.
handbook, full pagewidth
2.8
50.8
44
4
∅9
65.3 max.
CBW495
Fig.5 E55/28/21 clasp.
+0.5
6.8
0
0.2
min.
21 ±0.2
Dimensions in mm.
4.2
60.2 ±0.2
24.3
46
CBW068
56.1
Fig.6 E55/28/21 spring.
2008 Sep 01 440
Page 8
Ferroxcube
E cores and accessories E55/28/21
DATA SHEET STATUS DEFINITIONS
DATA SHEET
STATUS
Preliminary
specification
Product specification Production This data sheet contains final specifications. Ferroxcube reserves the right
DISCLAIMER
Life support applications These products are not designed for use in life support appliances, devices, or systems
where malfunction of these products can reasonably be expected to result in personal injury. Ferroxcube customers
using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Ferroxcube
for any damages resulting from such application.
PRODUCT STATUS DEFINITIONS
STATUS INDICATION DEFINITION
Prototype
Design-in These products are recommended for new designs.
Preferred
Support
PRODUCT
STATUS
Development This data sheet contains preliminary data. Ferroxcube reserves the right to
make changes at any time without notice in order to improve design and
supply the best possible product.
to make changes at any time without notice in order to improve design and
supply the best possible product.
These are products that have been made as development samples for the purposes of
technical evaluation only. The data for these types is provisional and is subject to
change.
These products are recommended for use in current designs and are available via our
sales channels.
These products are not recommended for new designs and may not be available
through all of our sales channels. Customers are advised to check for availability.
DEFINITIONS
2008 Sep 01 441
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