554 Siemens Matsushita Components
●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)
Σ
l/A
= 0,98 mm–1
l
e= 57 mm
A
e= 58 mm2
A
min = 57 mm2
V
e= 3310 mm3
Approx. weight 16,6 g/set
Ungapped
Gapped
The
A
Lvalue in the table applies to a core set comprising one ungapped core (dimension
g
=0)and
one gapped core (dimension
g
> 0).
Calculation factors (see page 423 for formulas)
Validity range:
K1
,
K2
: 0,10 mm <
s
< 1,40 mm
K3
,
K4
: 50 nH <
A
L < 410 nH
Material
A
L value
nH
µe
A
L1min
nH
P
V
W/set
Ordering code
N67 2000 + 30/– 20 % 1560 1280 2,10
(200 mT, 100 kHz, 100 ˚C) B66421-G-X167
N87 2000 + 30/– 20 % 1560 1280 1,80
(200 mT, 100 kHz, 100 ˚C) B66421-G-X187
Material
A
L value
nH
µe
g
approx.
mm
Ordering code
** = 67 (N67)
= 87 (N87)
N67, 160 ± 10 % 125 0,55 B66421-U160-K1**
N87 250 ± 10 % 195 0,30 B66421-U250-K1**
315 ± 10 % 246 0,22 B66421-U315-K1**
Material Relationship between
air gap –
A
L value Calculation of saturation current
K1
(25 ˚C)
K2
(25 ˚C)
K3
(25 ˚C)
K4
(25 ˚C)
K3
(100 ˚C)
K4
(100 ˚C)
N67 103 – 0,734 150 – 0,820 142 – 0,881
N87 103 – 0,734 154 – 0,796 138 – 0,873
EFD 25/13/9
Core B66421
Siemens Matsushita Components 555
Coil former
Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085:
F max.operating temperature 155 ˚C), color code green
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 page 156
Squared pins
Yoke
●Material: Stainless spring steel (0,4 mm)
Coil former Yoke
Coil former Ordering code
Sections
A
N
mm2
l
N
mm
A
R value
µΩ Pins
1 40,7 50 42,3 10 B66422-B1010-D1
Yoke (ordering code per piece, 2 are required) B66422-B2000
FEK0330-M
12345
109876
11,7+0,2
12,8 max.
1,7
0,6
16,4 min.
22,5
51
10 6
Montagelochung
5
CuSn6, verzinnt
Duroplast
25±0,2
_
13,1 0,15
_
26 0,3
ø 1,3+0,1
4 x 5 = 20
18 0,25
_
3,5±0,2
5,5+0,2
Markierung für Stift 1
12 0,2
_
0,11,6
_
0,218
_
0,16,9
_
Mounting holes
Marking of pin 1
View A
CuSn6, tinned
Thermosetting plastic
EFD 25/13/9
Accessories B66422
