28B1225-100 Laird Technologies, 28B1225-100 Datasheet - Page 4

• Manufacturer Part Number: 28B1225-100
• Description: EMI/RFI Suppressors & Ferrites 93ohms 100MHz 19.05mm Inside Dia.
• Manufacturer: Laird Technologies
• Type: Core-Solidr

Specifications of 28B1225-100

• Shielding: Unshielded
• Test Frequency: 100 MHz
• Product: Ferrite Cores
• Impedance: 93 Ohms
• Maximum Dc Resistance: 93 Ohms
• Operating Temperature Range: - 40 C to + 125 C
• Termination Style: Cable Snap
• Diameter, Cable: 0.75 "
• Impedance, At 100 Mhz: 93 Ohms
• Impedance, At 25 Mhz: 39 Ohms
• Impedance, At 300 Mhz: 210 Ohms
• Material, Core: 28
• Termination: Cable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FERRITE MATERIAL COMPARISON
· Select the appropriate ferrite material for the EMI frequency range to be attenuated (refer to cable core material impedance vs.
· Ferrite material composition affects core performance most. High performance material is best. Cheap, low performance materials
· 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
· 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
· Install the ferrite core near the noise source
· Additional turns through a core will provide multiple amounts of peak impedance.
· Two piece split cores are available. One-piece cylindrical or flat ribbon ferrite core shapes are usually preferable but, split cores can be
· Side by side impedance testing of ferrite cores is the best way to compare performance of different cores.
Example: Two wire turns provide 4 times the impedance of one turn (pass through) the ferrite core. Also, with each added turn, the peak

0.3
frequency chart above).
require the use of larger, heavier cores.
the use of smaller, lighter and lower cost cores.
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.
impedance shifts to a slightly lower frequency.
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.
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.
0.5
Optimized, high performance, low cost custom part designs are available.
LF, 8, HF Material Impedance vs Frequency ( 00 KHz -  GHz )
LF Low Frequency
8 Broadband High Performance
HF High Frequency
DESIGN & SELECTION “RULES OF THUMB”
1
Impedance Materials for Cable & Wiring Harness Cores
LF
5
10
Frequency ( MHz )
50
100
8
500
HF
1000
2000