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Products » Ferroxcube Cores » EMI-suppression beads. Configuration BD »

EMI-suppression beads. Configuration BD

Ferrite beads - small tubes for emi-suppression.
Ferrite beads produced by Ferroxcube are applied in high-frequency interference suppression when switching transistors, diodes in power wires. When using such cores the pins of electronic components are threaded through the beads holes. Among possible applications is parasitic oscillation reduction when using diodes in down converter circuit. Tne input circuit has a parasitic inductance. As pn-junction is characterised by some capacity a diode can't immediately be closed. The input circuit has a stray inductance. That's why a parasitic oscillating counter together with capacity of pn-junction is being formed. In such a case the beads are directly threaded on diodes pins in order to reduce such oscillations. Sometimes ferrite beads are threaded on transistors pins. The Pin of a transistor gate in a ferrite tube forms inductance which prevents to a sharp increasing of gate current. In such a case the tube works both as resistor and emi suppressor.

Geometrical dimensions and characteristics

The choiсe of tube depends on components pins on which filter is to be fixed. The inside diameter (d, mm) is being chosen depending on pins diameter. The dimension between components pins creates limitations towards outside diameter D.


The nomenclature of BD cores
Size Type Dimensions Impedance Ztype* at f, МHz
D d L 1 3 10 25 30 100 300
BD1,9/0,8/9,8-4S2 1,9 +0,2 0,8 +0,2 9,75 0,2 7 20 35 - 54 69 76
BD2,5/1,8/6,5-3C11                    
BD2,8/1,3/3-3S2                    
BD3,4/2/2-4S2                    
BD3,5/1,3/13-4S2 3,5 ±0,2 1,3 ±0,1 12,7 ±0,35 - - - 89 - 125 -
BD3,5/1,3/3,3-4S2 3,5 ±0,2 1,3 ±0,1 3,25 ±0,25 - - - 27 - 40 -
BD3,5/1,3/5-3B1                    
BD3,5/1,3/6-4S2 3,5 ±0,2 1,3 ±0,1 6 ±0,25 - - - 47 - 60 -
BD3/0,7/4-3S1 3 ±0,1 0,7 +0,1 4 ±0,2 24 48 49 - 39 33 29
BD3/0,7/4-4S2 3 ±0,1 0,7 +0,1 4 ±0,2 3 10 28 - 40 63 68
BD3/1/10-3S1 3 ±0,1 1 +0,1/0,05 10 ±0,3 41 90 91 0 74 63 55
BD3/1/10-4S2 3 ±0,1 1 +0,1/0,05 10 ±0,3 9 29 54 - 76 119 134
BD3/1/10-4S3-P 3 ±0,1 1 +0,1/0,05 10 ±0,3              
BD3/1/4-3S1 3 ±0,1 1 +0,1/0,05 4 ±0,2              
BD3/1/4-4S2 3 ±0,1 1 +0,1/0,05 4 ±0,2 4 11 23 - 31 48 54
BD3/1/4-4S3-P 3 ±0,1 1 +0,1/0,05 4 ±0,2              
BD4,2/0,8/4,6-4A11                    
BD5,1/0,8/10-3S1 5,1-0,3 0,75 +0,1 10 ±0,3 88 156 160 - 113 88 63
BD5,1/0,8/10-4S2 5,1-0,3 0,75 +0,1 10 ±0,3 15 50 94 - 138 213 238
BD5,1/0,8/4-3S1 5,1-0,3 0,75 +0,1 4 ±0,2 34 65 66 - 53 45 40
BD5,1/0,8/4-4S2 5,1-0,3 0,75 +0,1 4 ±0,2 6 19 38 - 55 85 96
BD5,1/1,5/10-3S1 5,1-0,3 1,5 +0,15 10 ±0,3 50 90 100 - 80 69 60
BD5,1/1,5/10-4S2 5,1-0,3 1,5 +0,15 10 ±0,3 9 31 56 - 85 130 145
BD5,1/1,5/10-4S3-P 5,1-0,3 1,5 +0,15 10 ±0,3              
BD5,1/1,5/4-3S1 5,1-0,3 1,5 +0,15 4 ±0,2 16 28 40 - 33 28 25
BD5,1/1,5/4-4S2 5,1-0,3 1,5 +0,15 4 ±0,2 4 13 25 - 34 51 59
BD5,1/2/10-3S1 5,1-0,3 2 +0,2 10 ±0,3 36 64 76 - 61 53 46
BD5,1/2/10-4S2 5,1-0,3 2 +0,2 10 ±0,3 8 19 38 - 64 100 111
BD5,1/2/4-3S1 5,1-0,3 2 +0,2 4 ±0,2 13 23 30 - 25 21 19
BD5,1/2/4-3S2-P 5,1-0,3 2 +0,2 4 ±0,2              
BD5,1/2/4-4S2 5,1-0,3 2 +0,2 4 ±0,2 3 10 19 - 25 40 45
BD5,1/2/7,1-4S2 5,1-0,3 2 +0,2 7,1 ±0,2 - - 34 - - 78 -
BD7,7/2,3/7,6-4S2 7,65-0,25 2,25 +0,25 7,55 ±0,25 - - - 63 - 92 -
BD8/1,5/10-4S2 8 ±0,2 1,5 +0,15 10 ±0,3 13 43 88 - 116 181 201
BD8/1,5/10-4S3-P                    
BD8/1,5/4-4S2 8 ±0,2 1,5 +0,15 4 ±0,2 5 18 34 - 48 71 81
BD8/2/10-3S2-P                    
BD8/2/10-4S2 8 ±0,2 2 +0,2 10 ±0,3 11 35 69 - 96 151 168
BD8/2/4-4S2 8 ±0,2 2 +0,2 4 ±0,2 5 13 25 - 39 61 69
BD8/3/10-3S2-P                    
BD8/3/10-4S2 8 ±0,2 3 +0,2 10 ±0,3 8 25 50 - 69 106 119
BD8/3/4-4S2 8 ±0,2 3 +0,2 4 ±0,2 3 10 19 - 28 43 48
BD8/3/4-4S2-/M                    

To check the presence of the cores in stock

The structure of the ordering code

BD5,1/0,8/10-3S1
BD — core configuration
5,1/0,8/10 — core size (outside and inside diameters, height)
3S1 — tube material

 
NORTH-WESTERN LABORATORY: NEWS
 
05.06 09 
Epcos has developed a new N95 power ferrite material with an exceptionally low power loss.



12.05 09 
New Epcos ferrite ring core sizes : N87 R20*12*6 and N87 R28*16*9



02.02 09 
New Epcos ferrite E core size : N87 E16/8/7,8 B66502GX187



 
 


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