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Products » Amorphous and nanocrystalline Cores » Toroidal amorphous and nanocrystalline MSTATOR cores » MSSN nanocrystalline cores with a rectangular hysteresis loop »

MSSN nanocrystalline cores with a rectangular hysteresis loop

Toroidal MSSN cores made of thin (25 ± 5 µm) Fe-based nanocrystalline ribbon represent a new class of products with unique properties. They complement the range of existing saturable cores made of Co-based amorphous alloy, traditionally used for high-quality multi-channel power supplies on the base of magnetic amplifiers.

Thanks to a careful selection of materials composition and the thermomagnetic processing modes, it was possible to achieve improved magnetic properties at high (up to 300 kHz) operating frequencies (coercitive force and losses are close to the characteristics of Co-based amorphous alloys) in combination with a very high saturation induction - 1.2 T (typical value for Fe-based alloys). In addition, a new soft magnetic material with square hysteresis loop has very high squareness ratio. Its thermal stability and increased operating temperatures (up to 120 °C) are higher in comparance with amorphous materials. The specific properties of new materials contribute to the reliability of magnetic amplifiers circuits, their performance improving and minimizing of size.

MSSN cores application: Magnetic amplifiers for SMPS, magnetic amplifiers for DC/DC converters, computer power supplies, pulse transformers.

Technical characteristics

MSSN cores advantages:
  • High squareness (magnetic amplifiers choke dead time reduction and improved adjustment mode)
  • Very high saturation induction (choke size reduction)
  • Low coercitive force (reverse recovery current reduction and overheating control)
  • Low core loss ( operating frequencies increasing)
  • Increased maximum operating temperature
MSSN series
Type Dimensions,
(outer diameter - inner diameter - height)
Mean line length
Window area Wa, sm² WaAc,sm4 Weight,
B-H loop parameters
@ F=100 kHz,
Нm=1Oe (80 А/m),
Total Flux
m (µWb)
Coercitive< force
Squareness ratio
Without a container In a container Nomin. Nomin. Nomin. Nomin. Nomin. ±13% max. min.
MSSN-10B-L 10.0-6.8-4.5 11.9-5.8-6.3 26.39 0.0562 0.26 0.0146 1.09 13.5 35.0 97.0
MSSN-11S-L 11.0-8.0-4.5 14.0-6.6-6.3 29.85 0.0527 0.34 0.0179 1.15 12.6
MSSN-13B-L 12.8-9.5-3.2 14.7-7.8-5.1 35.03 0.0412 0.49 0.020 1.06 9.9
MSSN-15S-L 15.0-10.0-4.5 16.9-8.6-6.5 39.25 0.0855 0.59 0.052 2.53 21.1
MSSN-18S-L 17.4-12.0-4.5 19.8-10.4-6.4 46.18 0.0948 0.85 0.080 3.22 22.7
* - Squareness ratio Br/Bm @ 1 kHz, 80А/m:97%
Operating temperature range -60°C ... +100°C

Designation in technical documentation

The example of MSSN cores ordering code:
MSSN-10B-L, where:
S - application (saturable );
N - material reference code (nanocrystalline);
10 – outer diameter, mm;
B – cross section reference code;
L – thermal treatment type (longitudinal field);

Stock availability


You can check MSSN cores stock availability, actual prices and send the order in our online-shop.

09.10 19 

LEPCOS invites you to attend the Stand C23 at ChipEXPO 2019 exhibition, which will be held from 16 to 18 October 2019 in Moscow in the Expocentre, in the pavilion "Forum".


26.06 19 
According to the results of 2018 Lepcos has received "best ferrites seller 2018" seal of excellence from TDK company.

18.04 19 
Dear colleagues! We would like to draw your attention to the fact that, since December 2018, the package content of electrolytic capacitors has been changed.


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