Noise-Suppression Bead Cores

MSB series

Cores of the MSB series are made of a thin amorphous ribbon (18 ± 2 μm) based on cobalt AMAG 172, have a rectangular hysteresis loop and significantly higher magnetic permeability compared to cores made of permalloy alloys based on Fe-Ni and ferrite analogs.

Having a very high inductance at the moment of current zero crossing, these products effectively block rapid changes in electrical current that could lead to electrical noise and interference, as well as damage to semiconductor devices by short high-potential surges.

Structurally, the products are optimized for use with a single-turn winding, which is usually the output of a component (transistor, diode).

 

This class of products provides a higher effective suppression of interference, essentially eliminating the cause of their occurrence, significantly reduces losses compared to classic RC dampers and ferrite cores of the same purpose.

 

DESIGN

The twisted ribbon core is placed in a rigid protective cylindrical container made of glass-filled polyamide and mechanically fixed with silicone sealant. The container provides reliable mechanical protection of the amorphous material and the preservation of its properties.

 

You can find more details about the benefits in the article:

"Application of small-sized noise suppressing cores made of amorphous metal alloys"

 

 

BASIC PROPERTIES OF THE USED AMORPHOUS MATERIAL AMAG172:  

  • Induction amplitude, Bm (25 °C) 0.60 T
  • Induction amplitude, Bm (90 °C) 0.54 T
  • Squareness coefficient Br / Bm (at 100 kHz, 80 A/m), not less than 0.88
  • Curie temperature, Tc 235 °C
  • Operating temperature range from –60 °C to +100 °C
  • Magnetostriction less than 0.1x10-6

APPLICATION:

  • Switching power supplies
  • Voltage converters
  • Electric motor control circuits
  • Switching semiconductor devices
  • Miniature Common Mode Filters
  • Semiconductor protection

BENEFITS:

  • Higher efficiency of blocking changes in electric current
  • Low losses
  • Low ripple output voltage from switching power supplies
  • Saving PCB space
  • Simplicity of design

EXAMPLE RECORD:

MSB-03A-N, where:

  • MS - MSTATOR;
  • B - application (interference suppression);
  • 03 - outer diameter, mm;
  • А - sectional designation;
  • N - type of heat treatment (without magnetic field)

 

OVERALL DIMENSIONS AND MAIN CHARACTERISTICS

Core name   Dimensions
dimensions in container
(without container)
(mm)		 Length
average
the lines
Lm
(mm)		 Effective section
Ас
(mm2)		 Coeff. inductance
AL
 (μH / turn2)
(50 kHz)		 Dynamic parameters
@ F = 100 kHz, Nm = 1 Oe (80 A/m), 25 °C
Full
flow
2Fm
(μBb)		 Coercive force
Hc
(A/m)		 Coeff.
rectangular
Br/Bm
(%)
Nominal Nominal Nominal Nominal Min Max Min
MSB-03A-N ​​ 4,0 - 1,5 - 4,5
(3,0 - 2,0 - 3,0)		 7,75 1,2 3,0 1,1 25 88
MSB-03S-N ​​ 4,0 - 1,5 - 6,0
(3,0 - 2,0 - 4,5)		 7,75 1,8 5,0 1,65
MSB-03B-N ​​ 4,0 - 1,5 - 7,5
(3,0 - 2,0 - 6,0)		 7,85 2,4 7,0 2,2
MSB-04S-N ​​ 5,1 - 1,5 - 6,0
(4,0 - 2,0 - 4,5)		 9,06 3,6 9,0 3,3
MSB-04B-N ​​ 5,1 - 1,5 – 7,5
(4,0 - 2,0 - 6,0)		 9,06 4,8 12,0 4,4
MSB-045A-N ​​ 6,5 - 2,4 - 6,0
(4,5 - 4,0 - 3,0)		 13,3 0,59 0,89 0,62
MSB-05A-N ​​ 7,0 - 2,4 - 6,0
(5,0 - 4,0 - 3,0)		 14,1 1,17 1,4 1,05

Note:

  • Operating temperature range from -60 °C to +100 °C

 

 

ADDITIONAL PARAMETERS AND CHARACTERISTICS ​​

 

Frequency dependence of inductance

 

​ Application Note (MSB Series)

​  Program for calculating interference suppression chokes