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Products » Amorphous and nanocrystalline Cores » Toroidal amorphous and nanocrystalline MSTATOR cores » Noise suppression spike killer cores (MSK cores) »

Noise suppression spike killer cores (MSK cores)

MSK cores (MSTATOR) are made of thin (25±5 microns) Co-based amorphous ribbon. These products have square B-H loop and much higher permeability than their analogs made of Fe-Ni-based permalloys and ferrites. Having a very high inductance when current transiting through zero, these products effectively block the electrical current rapid changes, which can lead to electrical noise, as well as the damage of semiconductor devices with a short high-potential emission. This class of products provides more efficient noise reduction, essentially eliminating their cause. Also such cores significantly reduce losses compared to the classical RC snubbers and ferrite cores of similar purpose.

Configuration: Ribbon wound core is placed into a rigid protective container made of glass-filled polyamide and mechanically fixed with silicone sealant. The container has rounded edges and is designed for direct application of the winding with a thick wire. The container provides a reliable mechanical protection of amorphous material and preservation of its properties. All materials comply with UL94V-1 / 0.

Application: SMPS, voltage converters, electric motor control circuits, switching semiconductor devices, miniature common mode filters, semiconductor protection devices.

Technical features

Advantages of MSK cores:
  • Higher efficiency of electrical current blocking changes
  • Low ripple output voltage of switching power supplies
  • Easy design
  • Low losses
MSK series
Type Dimensions in a container *
(without a container)
Mean line length

AL **
( µH/ T²)
m x Aw***
µWb x mm²
Dynamic parameters
@ F=100 kHz,
Нm=1Oe (80 А/м),
m (µWb)
Coercitive force
Squareness ratio
Nomin. Nomin. Nomin. min. Nomin. ±15% max. min.
MSK-09S-N 10.7-5.5-6.3
25.0 3.5 1.8 93.6 3.9 25 94
MSK-10S-N 11.9-5.8-6.3
27.0 4.7 2.2 137.8 5.3
MSK-12A-N 14.0-6.6-4.8
31.0 4.7 1.9 176.8 5.2
MSK-12S-N 14.0-6.6-6.3
31.0 7.0 2.8 268.6 7.9
MSK-15A-N 16.7-10.5-6.3
42.2 5.3 1.6 513.3 5.9
MSK-15S-N 16.9-8.6-6.5
38.7 8.8 2.8 578.2 9.8
MSK-18S-N 19.8-10.4-6.4
46.5 10.5 2.8 1003.0 11.8
MSK-21S-N 22.8-12.4-6.3
54.2 12.3 2.8 1669.8 13.8
* Outer diameter – Inner diameter – Height
** At F=50 kHz, Urms=1 V, T=25 °C.
*** 2Фm – the maximum magnetic flux in the core [ µWb]; Аw –Winding window[mm²]
**** Operating temperature range: –60°C ... +100°C

Designation in technical documentation

The example of MSK series ordering code:
MSK-10S-N, where:
K – application (Spike killers);
10 – outer diameter, mm;
S – cross section reference code;
N – thermal treatment without magnetic field;

Stock availability


You can check MSK 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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