RA28B1729

Series:	--
Part Status:	Active
Type:	Flat
Design:	Hinged (Snap On)
Impedance @ Frequency:	200 Ohm @ 100MHz
Material:	28
Inner Dimension:	1.354" W x 0.059" H (34.40mm x 1.50mm)
Outer Dimension:	2.031" W x 0.701" H (51.60mm x 17.80mm)
Ratings:	--
Mounting Type:	Free Hanging
Length:	1.311" (33.30mm)

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Ferrite Cores - Cables and WiringFerrite cores, also known as ferrite beads, are diffusion bonded magnetic alloy cores, featuring high permeability and low coercivity respectively, which block common-mode currents or \'noise\' from interfering with the signals in shielded cables and wiring. A type of ferrite core used widely today is identified by its catalog number RA28B1729.
RA28B1729 is part of the RA series of ferrite cores and is mainly used for surface mount, miniaturised equipment applications, such as mobile phones and computers, where low profile, lightweight components are desirable. The core has been developed with a wide range of features to meet the requirements of the application, with a low temporal and dielectric losses, providing a superior signal-to-noise ratio.
RA28B1729’s application field is centered around the broadband frequency range, where applications from HF to UHF are possible. It typically works in a linear operating frequency range from 15 MHz to 1000 MHz, and supports a low insertion loss of ≈15-20 dB. Additionally, the core features a low electrical resistance of 0.03 to 0.11 mΩ, depending on frequency.
When energy is applied to the core, the ferrite material reorientates in such a way as to induce a magnetic field, which blocks any interference from external electromagnetic fields. Such ferrite materials can also be used to direct current or ‘bias’ those properties, allowing for higher shielding efficiency, even at the highest frequencies.
Physically, RA28B1729 is rectangular in shape being 20 mm × 9 mm × 9 mm and has a maximum lifespan of at least 10 years under normal working conditions. At the same time, it is suitable for moderate temperatures between 15°C and 75°C, as well as a peak temperature of 120°C. Furthermore, the core has UL94V-0 flammability rating and has been tested and certified with regard to immunity to electromagnetic fields and radio frequency interference (RFI). This guarantees that it can be used in both sensitive and demanding industrial, automotive and telecoms applications, without any interference or performance issues.
RA28B1729’s working principle is based on the winding of magnetic material around an insulated copper wire. This setup creates a series of spiral inductors, arranged in two-dimensional arrays, which are then oriented in opposite directions to induce a physical shield. This configuration results in a large amount of the electromagnetic energy getting absorbed, instead of being collected as interference in the surrounding environment. In this way, it serves as a signal-to-noise barrier, reducing unwanted ‘noise’, while also guaranteeing that the signal remains clear, sustained and reliable.
In conclusion, RA28B1729 is a ferrite core, designed for broadband applications, which provides superior signal-to-noise ratio, low insertion loss, and excellent shielding capability. This, in combination with its small size, lightweight profile, flame retardant construction material, and high temperature resistance make it an ideal choice for use in a variety of modern technologies.

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