Nanocrystalline Replaces High Perm Ferrite in Common Mode Chokes
The ferrite industry has been affected by an extreme shortage of product in 2010. This is primarily due to an increase in ferrite consumption in Asia. We have seen ferrite manufacturers either discontinue their 15K permeability ferrite or highly restrict the manufacturing of this extreme material. (15K perm material is very difficult to make and keep within spec) Even the 10K permeability material is seeing lead times of 30 weeks and longer.
MH&W International is offering a solution to the problems of high perm ferrite and the shortage of high perm ferrite with our Nanocrystalline toroidal cores for common mode chokes. There are significant advantages of Nanocrystalline over 15K & 10K perm material.
|
10K Perm Ferrite
|
15K Perm Ferrite
|
Nanocrystalline
|
|
|---|---|---|---|
| Saturation Flux Density |
400 mT
|
360 mT
|
1,200 mT
|
| Curie Temperature |
120°C
|
105 °C
|
600°C
|
| Core Loss |
High
|
High
|
Low ( >110W/Kg)
|
| Magnetostriction/Vallari Effect |
Susceptible
|
Highly Susceptible
|
No apparent effect
|
Nanocrystalline is available with Permeabilities of 1,000 to 90,000.
MH&W keeps stock of some of the more common sizes of Nanocrystalline toroids. Here is a table of the most prevalent Nanocrystalline toroids.
|
Part Number
|
OD
|
ID
|
TH
|
Aℓ (nH)
|
Aℓ Freq
|
Aℓ min
|
Aℓ max
|
|---|---|---|---|---|---|---|---|
|
M-003
|
25
|
16
|
10
|
67000
|
10KHz
|
45000
|
89000
|
|
M-061
|
25
|
20
|
10
|
10800
|
10KHz
|
6600
|
15000
|
|
M-062
|
25
|
16
|
10
|
20550
|
10KHz
|
13700
|
27400
|
|
M-076
|
20
|
12.5
|
8
|
14600
|
10KHz
|
9700
|
19500
|
|
M-224
|
24
|
15
|
8
|
15500
|
10KHz
|
10000
|
21000
|
|
M-449
|
25
|
16
|
10
|
4900
|
100KHz
|
3800
|
6000
|
|
M-450
|
30
|
20
|
10
|
4750
|
100KHz
|
3500
|
6000
|
|
M-306
|
16
|
11
|
5
|
8850
|
10KHz
|
5900
|
11800
|
|
M-307
|
20
|
15
|
5
|
6800
|
10KHz
|
4500
|
9100
|
|
M-308
|
25
|
20
|
5
|
5250
|
10KHz
|
3500
|
7000
|
|
M-309
|
30
|
25
|
5
|
4250
|
10KHz
|
2800
|
5700
|
|
M-310
|
40
|
35
|
5
|
3150
|
10KHz
|
2100
|
4200
|
Graphs (click thumbnail for larger image):
