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Ferrite EMI Cable Cores
Electro-Magnetic Interference Solutions
www.lairdtech.com
Laird Technologies is the world leader in the design and supply of
customized performance critical products for wireless and other advanced
electronic applications. Laird Technologies partners with it's customers to
help find solutions for applications in various industries such as:
Aerospace
Automotive Electronics
Computers
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Medical Equipment
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Network Equipment
Telecommunications
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to research and development and a seamless network of manufacturing
and customer support facilities located all across the globe.
global
solutions :
local
support
™
www.lairdtech.com
Contents
Ferrite Material Impedance Comparison ................................. 4
Design & Selection “Rules of Thumb” ..................................... 4
High Frequency (HFB-) Cylindrical Cores .................................. 5
High Frequency (HFA-) Split, Snap-On Cores ........................... 6
Broadband (28B-) Cylindrical Cores ........................................ 7
Broadband (28A-) Split, Snap-On Cores ................................ 10
Sorted Quick Reference Charts
Broadband (28B- and 28A-) Cable Cores .......................... 12
Low Frequency (LFB-) Cylinderical Cores ............................... 14
Broadband (28R-) Ribbon & Flex Cable Cores ....................... 15
Broadband (28S-) Split Ribbion & Flex Cable Cores .............. 18
Sorted Quick Reference Charts
Broadband (28R- and 28S-) Ribbon Cores ......................... 20
Ferrite EMI Disks & Plates ..................................................... 22
All parts listed in this catalog are lead free and RoHS compliant.
This catalog contains a limited selection of
Laird Technologies, cable core products.
Refer to www.lairdtech.com for other cable core
products not included in this cable core catalog.
visit
www.lairdtech.com
for product additions and more product details
FERRITE MATERIAL COMPARISON
LF, 8, HF Material Impedance vs Frequency ( 00 KHz - GHz )
Impedance Materials for Cable & Wiring Harness Cores
HF
LF Low Frequency
8 Broadband High Performance
HF High Frequency
8
Impedance ( Z ) in Ohms (
Ω
)
LF
0.3
0.5
1
5
10
50
100
500
1000
2000
Frequency ( MHz )
DESIGN & SELECTION “RULES OF THUMB”
· Select the appropriate ferrite material
for the EMI frequency range to be attenuated (refer to cable core material impedance vs.
frequency chart above).
· Ferrite material composition affects core performance most.
High performance material is best. Cheap, low performance materials
require the use of larger, heavier cores.
· Shape (design) and mass of the ferrite core significantly affect impedance.
· Don’t over size.
Use high performance ferrite material and select the smallest core that will do the job. High performance material allows
the use of smaller, lighter and lower cost cores.
· Select a ferrite core that fits
over the cable’s outside dimensions. Core should slide easily over the cable during installation.
· When possible, install a cable core over wires in a common-mode configuration
(out and back lines inside the same ferrite cable
core). A differential cable pair inside the same core will make the ferrite core a common mode choke that is not susceptible to
saturation from very high currents.
· Install the ferrite core near the noise source
· Additional turns through a core will provide multiple amounts of peak impedance.
Example: Two wire turns provide 4 times the impedance of one turn (pass through) the ferrite core. Also, with each added turn, the peak
impedance shifts to a slightly lower frequency.
· Two piece split cores are available.
One-piece cylindrical or flat ribbon ferrite core shapes are usually preferable but, split cores can be
used in applications where cores cannot slide over cable ends and connectors. Some split cores are available with snap-on plastic
cases or metal clips.
· Side by side impedance testing of ferrite cores is the best way to compare performance of different cores.
Ferrite core impedance measurement equipment and test methods are not standardized in the industry. Every ferrite company has
their own test methods. Catalog (web site) impedance data cannot be accurately compared.
Optimized, high performance, low cost custom part designs are available.
High Frequency Ferrite Cylindrical EMI Cores
00 MHz to GHz Optimized
Cylindrical Solid Ferrite Cores for Round Cables & Wiring Harnesses
Part
Number
A
HFB075024-000
HFB095051-100
HFB095051-200
HFB123049-000
HFB123049-100
HFB123049-300
HFB143064-000
HFB143064-100
HFB143064-300
HFB150070-200
HFB152034-000
HFB157070-000
HFB159079-100
HFB160093-200
HFB160093-300
HFB170070-000
HFB170070-100
HFB187102-100
HFB259128-100
7.52
(0.296)
9.52
(0.375)
9.52
(0.375)
12.32
(0.485)
12.32
(0.485)
12.32
(0.485)
14.27
(0.562)
14.27
(0.562)
14.27
(0.562)
14.99
(0.590)
15.24
(0.600)
15.65
(0.616)
15.88
(0.625)
16.00
(0.630)
16.00
(0.630)
16.99(
0.669)
16.99
(0.669)
18.67
(0.735)
25.91
(1.020)
DIMENSIONS
mm
(inches)
B
2.39
(0.094)
5.08
(0.200)
5.08
(0.200)
4.88
(0.192)
4.88
(0.192)
4.88
(0.192)
6.35
(0.250)
6.35
(0.250)
6.35
(0.250)
6.99
(0.275)
3.38
(0.133)
6.99
(0.275)
7.87
(0.310)
9.25
(0.364)
9.25
(0.364)
7.01
(0.276)
7.01
(0.276)
10.16
(0.400)
12.83
(0.505)
C
Net Impedance ( Z ) in Ohms (
Ω
)
B
C
10.00
(0.394)
10.00
(0.394)
19.00
(0.748)
5.00
(0.197)
10.00
(0.394)
25.40
(1.000)
5.00
(0.197)
10.00
(0.394)
28.58
(1.125)
28.58
(1.125)
10.00
(0.394)
20.00
(0.787)
28.58
(1.125)
19.00
(0.748)
27.99
(1.102)
10.00
(0.394)
20.00
(0.787)
30.00
(1.181)
28.58
(1.125)
@ 00
MHz
124
64
120
50
97
258
43
85
270
242
165
170
235
120
170
97
185
205
175
@ 00
MHz
136
74
135
56
110
287
50
100
315
287
190
200
290
145
198
115
215
250
210
@ 800
MHz
138
89
151
63
120
300
58
113
270
270
189
220
302
155
232
127
239
270
254
@1
GHz
138
85
147
61
115
246
60
115
200
204
185
205
260
170
220
140
220
210
250
A
All impedance values for high frequency
cores are NET; NET impedance is
impedance of the ferrite core only. All
impedance contribution from the test wire
and fixtures has been removed.
This catalog lists a limited sample of available parts. Custom parts are also available.
visit
www.lairdtech.com
for product additions and more product details
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