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NANOCRYSTALLINE CORES FOR HIGH UNBALANCED OR HIGH COMMON MODE CURRENTS

This tape wound cores made of nanocrystalline VITROPERM 250 and VITROPERM 712 offer increased bias current capabilities and superior broadband RFI-attenuation in comparison to typical EMI ferrites. They have been designed for all EMI problems with high unbalanced currents, high Common-Mode currents or high DC-Currents.

VITROPERM 250 F offers significant advantages in volume and performance for RFI-noise suppression, for reduction of shaft voltages or as a solution for bearing currents of motors driven by Variable Frequency Drives or high unbalanced currents in Welding Units and some other applications. Based on the high saturation induction of VITROPERM, higher inductance values to attenuate common mode noise and higher leakage inductance to attenuate differential mode noise at the same nominal current can be achieved. Due to low core losses, VITROPERM leads to lower operational temperature of the component. Vice versa, the low core losses and the extended temperature range allow miniaturization of the common mode choke.

VITROPERM 712 closes the gap between VITROPERM 500 (µ=17,000 - 100,000) and VITROPERM 250 (µ=3,000 - 5,000) with a permeability (µ) of 12,000. VITROPERM 712 F offers a medium unbalance current capability (LF and HF) and a superior broadband RFI attenuation compared to the other typical EMI ferrites.

In summary, common mode chokes with nanocrystalline cores of VITROPERM 250 and VITROPERM 712 offer the following features:

  • about 2.5 times higher unbalanced currents than ferrites (µ ~ 5,000) for same core size and same number of turns
  • broadband insertion loss characteristic with good attenuation performance over a wide frequency band
  • small choke size for volume and weight optimized solutions
  • simple design and improved product reliability

Further information is available in the brochure EMC products based on nanocrystalline VITROPERM and in the flyer VITROPERM 712.

VAC-product 

core dimensions 

limiting dimensions
(incl. case or coating) 

iron cross section 

mean path length 

AL 

Icm 

weight 

 

OD x ID x H 

OD 

ID 

AFe 

lFe 

at 100 kHz nominal 

 

mFe 

 

mm x mm x mm 

mm 

mm 

mm 

cm2 

cm 

μH 

A

T60006-L2016-V165

16 x 10 x 6

17.9

8.1

8.1

0.14

4.1

2.0

5.4

4.0

T60006-L2025-V349

25 x 16 x 10

27.9

13.6

12.5

0,4

6.4

7.6

4.1

17.0

T60006-L2025-W980

25 x 16 x 10 

27.9

13.6

12.5

0.4

6.4

3.1

9.6

17.0

T60006-L2030-W981

30 x 20 x 10 

32.8

17.6

12.5

0.40

7.9

2.8

11.8

23.0

T60006-L2040-W964

40 x 32 x 15 

43.1

28.7

18.5

0.46

11.3

2.2

17.0

38.0

T60006-L2040-V296

40 x 25 x 15

43.1

22.5

18.5

0.9

10.2

11.3

6.5

64.0

T60006-L2050-V166

50 x 40 x 20

53.5

36.6

23.4

0.76

14.1

3.0

21.0

79.0

T60006-L2063-X348

63 x 50 x 25

67.3

46.5

28.6

1.2

17.8

9.3

11.0

163

T60006-L2063-W985

63 x 50 x 25 

67.3

46.5

28.6

1.2

17.8

3.2

31.0

163

T60006-L2080-V091

80 x 50 x 20

86.0

44.7

25.7

2.3

20.4

9.2

28.0

347

T60006-L2090-W984

90 x 60 x 20 

95.4

54.7

24.7

2.3

23.6

4.5

42.0

400

T60006-L2063-V347

102 x 76 x 25

108.1

70.0

30.3

2.5

28.0

11.9

18.0

515

T60006-L2102-W947

102 x 76 x 25 

108.1

70.0

30.3

2.5

28.0

4.2

49.0

515

T60006-L2160-V350

160 x 130 x 25

116.9

123.9

30.5

2.9

45.6

8.4

29.0

970

T60006-L2160-W982

160 x 130 x 25 

166.9

123.9

30.5

2.9

45.6

2.9

82.0

970

AL = Inductance for N = 1 (Tolerance +45 % / -25 %)
Icm : the listed saturation currents are guidelines, only. They are calculated for nominal core dimensions at room temperature and for approx. 70 % saturation flux density.

Further information can be found here:

General Information
Application note (brochure)
RoHS information

Nanocrystalline Cores
Cores with epoxy resin coating
Cores in plastic casing
Core Sample Kit VITROPERM
Core stack assemblies

Chokes
Chokes

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Last update: 22.02.2019