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Please read Cautions and warnings and
Important notes at the end of this document.
■ E core with flattened, lower center leg
for especially flat transformer design
■ For DC/DC converters
■ Delivery mode: single units
Magnetic characteristics (per set)
Σl/A= 0.99 mm
–1
l
e
= 68 mm
A
e
= 69 mm
2
A
min
= 69 mm
2
V
e
= 4690 mm
3
Approx. weight 24 g/set
Ungapped
Other A
L
values/air gaps and materials available on request – see Processing remarks on page 4.
Gapped (A
L
values/air gaps examples)
The A
L
value in the table applies to a core set comprising one ungapped core (dimension g = 0 mm)
and one gapped core (dimension g > 0 mm).
Calculation factors (for formulas, see “E cores: general information”)
Validity range: K1, K2: 0.10 mm < s < 2.00 mm
K3, K4: 70 nH < A
L
< 630 nH
Material A
L
value
nH
μ
e
P
V
W/set
Ordering code
N87 2050 +30/–20% 1610 < 2.6 (200 mT, 100 kHz, 100 °C) B66423G0000X187
N97 2150 +30/–20% 1690 < 2.2 (200 mT, 100 kHz, 100 °C) B66423G0000X197
Material A
L
value
nH
μ
e
g
approx. mm
Ordering code
N87 160 ±10% 125 0.71 B66423U0160K187
250 ±10% 196 0.38 B66423U0250K187
315 ±10% 246 0.27 B66423U0315K187
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)
N87 125 –0.712 176 –0.796 161 –0.873
B66423Core
EFD 30/15/9
