EFD 25/13/9
■ E core with flattened, lower center leg
for especially flat transformer design
■ For DC/DC converters
■ EFD cores are supplied as single units
Magnetic characteristics (per set)
Σl/A = 0,98 mm
–1
le= 57 mm
= 58 mm
A
e
A
= 57 mm
min
Ve= 3 310 mm
2
2
3
Approx. weight 16,6 g/set
Ungapped
B66421Core
Material A
nH
value
L
µ
e
A
nH
L1min
P
V
W/set
N87 2000 + 30/– 20 % 1560 1280 < 1,80
Ordering code
B66421-G-X187
(200 mT, 100 kHz, 100 °C)
Gapped
Material A
N87 160
The A
nH
value
L
µ
e
g
Ordering code
approx. mm
± 10 % 125 0,55 B66421-U160-K187
± 10 % 195 0,30 B66421-U250-K187
250
± 10 % 246 0,22 B66421-U315-K187
315
value in the table applies to a core set comprising one ungapped core (dimension g = 0) and
L
one gapped core (dimension g > 0).
Calculation factors (for formulas, see “E cores: general information”, page 382)
Material Relationship between
air gap – A
value
L
Calculation of saturation current
K1 (25 °C) K2 (25 °C) K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
N87 103 – 0,734 154 – 0,796 138 – 0,873
Validity range: K1, K2: 0,10 mm < s < 1,40 mm
K3, K4: 50 nH < A
< 410 nH
L
512 08/01
EFD 25/13/9
B66422Accessories
Coil former
Material: GFR thermosetting plastic; UL 94 V-0, insulation class to IEC 60085:
B66422-B: F max.operating temperature 155 °C; color code green
B66422-W: H max.operating temperature 180 °C; color code black
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 °C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 °C, 3,5 s
Winding: see “Processing Notes”, page 157
Squared pins
Yoke
Material: Stainless spring steel (0,4 mm)
Coil former Ordering code
Sections A
mm
N
2
l
N
mm
A
µΩ
value
R
Pins
1 40,7 50 42,3 10 B66422-B1010-D1
B66422-W1010-D1
Yoke (ordering code per piece, 2 are required) B66422-B2000
Coil former Yoke
25±0,2
_
13,1 0,2
12345
Mounting holes
Montagelochung
10 6
ø 1,3+0,1
View A
Ansicht A
6,15
1,21,2
Marking of pin 1
Markierung für Stift 1
12,9 max.
1,7
3,5±0,2
_
109876
Duroplast
Thermosetting plastic
_
18 0,25
11,7+0,2
0,6
CuSn6, verzinnt
CuSn6, tinned
26 0,3
5,5
22,5
5
4 x 5 = 20
_
0,218
16,4 min.
_
12 0,2
0,11,6
_
51
6,9
FEK0330-M
25,6
8,3 max.
23,7 min.
A
FEK0273-Z
513 08/01
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