556 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
= 0,99 mm–1
l
e= 68 mm
A
e= 69 mm2
A
min = 69 mm2
V
e= 4690 mm3
Approx. weight 24 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
< 2,00 mm
K3
,
K4
: 70 nH <
A
L < 630 nH
Material
A
L value
nH
µe
A
L1min
nH
P
V
W/set
Ordering code
N67 2050 + 30/– 20 % 1610 1280 3,00
(200 mT, 100 kHz, 100 ˚C) B66423-G-X167
N87 2050 + 30/– 20 % 1610 1280 2,60
(200 mT, 100 kHz, 100 ˚C) B66423-G-X187
Material
A
L value
nH
µe
g
approx.
mm
Ordering code
** = 67 (N67)
= 87 (N87)
N67, 160 ± 10 % 125 0,71 B66423-U160-K1**
N87 250 ± 10 % 196 0,38 B66423-U250-K1**
315 ± 10 % 246 0,27 B66423-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 125 – 0,712 172 – 0,820 166 – 0,881
N87 125 – 0,712 176 – 0,796 161 – 0,873
EFD 30/15/9
Core B66423
Siemens Matsushita Components 557
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
Square pins
Yoke
●Material: Stainless spring steel (0,45 mm)
Coil former Yoke
Coil former Ordering code
Sections
A
N
mm2
l
N
mm
A
Rvalue
µΩ Pins
1 52,3 56,7 37,3 12 B66424-B1012-D1
Yoke (ordering code per piece, 2 are required) B66424-B2000
Mounting holes
Marking of pin 1
View A
CuSn6, tinned
Thermosetting plastic
EFD 30/15/9
Accessories B66424
