FM25G142MYBPF Hitachi Metals, Ltd, FM25G142MYBPF Datasheet - Page 28

• Manufacturer Part Number: FM25G142MYBPF
• Description: Three-phase Fm-a Coils
• Manufacturer: Hitachi Metals, Ltd

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Table 24. Comparison of magnetic and physical properties among FT-3AM and conventional materials.
DC magnetic properties at 800A/m
Pulse width τs=0.1μs Operating magnetic flux density △B=0.2T
Features
Applications
Saturation flux density, Bs* (T)
Squareness ratio, Br/Bs*
Coercive force, Hc*
Pulse permeability, μrp**
Core loss, Pcv**
Curie temperature, Tc
Saturation magnetostriction,λs［×10
Electrical resisitivity, ρ
Density, d
Surge Absorber Cores
1) The saturation magnetic flux density is twice as high as that of Co-based amorphous metal and three times higher than
2) The temperature characteristics of FINEMET is very stable due to its high Curie temperature, (570℃).
3) Unlike Co-based amorphous metal, which has relatively large aging effects (decrease of permeability and increase of
FINEMET beads made of FT-3AM material and MP series saturable cores made of FT-3SH material are suitable for
surge absorber used for medium to large handling power.
Having high saturation flux density (Bs=1.23T) and low core loss (80Wkg at 100kHz, Bm=0.2T), MP series cores are
also suitable for saturable cores in magamp circuit driven below 150kHz.
Features of FT-3AM and FT-3SH cores:
1. Suppression of reverse recovery current and surge current from diode in switching mode power supplies or invertors.
2. Suppression of surge current at the moment of activation of switching diode, such as power MOS-FET.
3. Suppression of spike or ringing current generated in switching circuit.
that of Ni-Zn ferrite. The pulse permeability and the core loss are comparable to Co-based amorphous metal. As a
result, small-size cores using FT-3AM/FT-3SH offer higher performance in suppression of surge current and voltage.
(Curie temperature of Co-based amorphous metal and Ni-Zn ferrite is around 200℃.)
coercivity and core loss over time), the aging effects of FINEMET is very small.
For safety and the proper usage, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering.
This catalog and its contents are subject to change without notice.
(A/m)
（μ Ω ・ m）
（kg/m
（J/m
（℃）
100℃
100℃
100℃
20℃
20℃
20℃
-6
3
3
］
）
）
7.3×10
FT-3AM
3,500
∼ −
1.23
1.20
0.50
0.48
570
0
2.5
7.5
1.2
─
3
7.3×10
FT-3SH
4,000
1.23
1.20
0.90
0.88
0.60
∼ −
570
0
6.5
1.2
─
3
Co-based amorphous
7.7×10
4,500
0.60
0.53
0.80
0.78
0.30
0.29
∼ −
210
0
6.0
1.3
3
Ni-Zn ferrite
5.2×10
1×10
0.38
0.29
0.71
0.60
-7.8
500
200
7.0
30
20
12
3