B66421 datasheet(2/5 Pages) EPCOS

2 / 5 page

09/06

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= 0.98 mm–1

= 57 mm

= 58 mm2

Amin = 57 mm2

= 3310 mm3

Approx. weight 16.6 g/set

Ungapped

Gapped

The AL value in the table applies to a core set comprising one ungapped core (dimension g = 0) and

one gapped core (dimension g > 0).

Calculation factors (for formulas, see “E cores: general information”)

Validity range:

K1, K2: 0.10 mm < s < 1.40 mm

K3, K4: 50 nH < AL < 410 nH

Material

AL value

W/set

Ordering code

N87

2000 +30/–20%

1560

< 1.8 (200 mT, 100 kHz, 100 °C)

B66421G0000X187

N97

2100 +30/–20%

1640

< 1.5 (200 mT, 100 kHz, 100 °C)

B66421G0000X197

Material

AL value

approx. mm

Ordering code

N87

160

±10%

125

0.55

B66421U0160K187

250

±10%

195

0.30

B66421U0250K187

315

±10%

246

0.22

B66421U0315K187

Material

Relationship between

air gap – AL value

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

B66421

Core

EFD 25/13/9

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