2

09/06

Please read Cautions and warnings and

Important notes at the end of this document.

Material properties

Preferred application

Broadband transformers

Material

N45

Base material

MnZn

Symbol

Unit

Initial permeability

(T = 25 °C)

μ

i

3800

±25%

Meas. field strength

Flux density (near

saturation) (f = 10 kHz)

H

A/m

mT

mT

550

435

Coercive field strength

(f = 10 kHz)

A/m

A/m

15

21

Optimum

frequency range

MHz

0.01 … 0.10

tan

δ/μ

i

<1.0

<2.0

Hysteresis

material constant

η

B

Curie temperature

°C

>255

Relative

temperature coefficient

at 25 … 55 °C

at 5 … 25 °C

α

F

–8 … –5.0

1.5 … 3.0

Mean value of

α

F

at 25 … 55 °C

—

Density (typical values)

4900

Disaccommodation

factor at 25 °C

DF

—

Resistivity

ρΩm11

Core shapes

ER, EP, RM

N45

SIFERRIT materials