2744051447 Fair-Rite, 2744051447 Datasheet - Page 2

• Manufacturer Part Number: 2744051447
• Description: EMI/RFI Suppressors & Ferrites Z=33 OHM @ 100MHz
• Manufacturer: Fair-Rite

Specifications of 2744051447

• Shielding: Unshielded
• Test Frequency: 100 MHz
• Product: Ferrite Beads
• Impedance: 275 Ohms
• Operating Temperature Range: - 55 C to + 125 C
• Termination Style: Axial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Fair-Rite Products Corp.
Phone: (888) FAIR RITE / [phone]
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History
The history of magnetism began with the discovery of the prop-
erties of a mineral called magnetite (Fe
deposits were found in the district of Magnesia in Asia Minor
(hence the mineral’s name) where it was observed, centuries
before the birth of Christ, that these naturally occurring stones
would attract iron. Later on it found application in the lodestone
of early navigators. In 1600 William Gilbert published De Magnete ,
the first scientific study on magnetism. In 1819 Hans Christian
Oersted observed that an electric current in a wire affected a
magnetic compass needle, thus with later contributions by Fara-
day, Maxwell, Hertz and others, the new science of electromag-
netism came into being.
Even though the existence of naturally occurring magnetite, a
weak type of hard ferrite, had been known since antiquity,
producing an analogous soft magnetic material in the laboratory
proved elusive. Research on magnetic oxides was going on
concurrently during the 1930’s, primarily in Japan and the
Netherlands. However, it was not until 1945 that J. L. Snoek of
the Philips’ Research Laboratories in the Netherlands suc-
ceeded in producing a soft ferrite
applications.
Fair-Rite Products Corp. was not far behind in the manufacture
and sale of soft ferrites for use in the electronics industry. It was
formed in 1952 and officially started operations in 1953. The
ensuing years have seen a rather crude product, which was
available in only a few shapes and materials, develop into a
major line of ferrite components for inductive devices, produced
in many core configurations with a wide selection of materials.
The application of ferrites in EMI suppression as shield beads
and broadband chokes, where an effective resistive impedance
is produced at high frequencies, has grown so fast in the last
decade, that their use as EMI suppressors is limited only by the
imagination of the end user.
Soft Ferrites
The single most important characteristic of soft ferrites, as com-
pared to other magnetic materials, is the high volume resistivity
exhibited in the monolithic form. Since eddy current losses are
inversely proportional to resistivity and these losses increase
with the square of the frequency, high resistivity becomes an
essential factor in magnetic materials intended for high fre-
quency operation. The magnetic properties of ferrite components
are isotropic, and by employing various pressing, injection
molding, and/or grinding techniques, a wide range of complex
shapes can be formed. There is no other class of magnetic
material that can match soft ferrites in performance, cost and
volumetric efficiency, over the range from audio frequencies to
above 500 MHz.
*Footnote: The difference between hard and soft ferrite is not tactile, but rather a magnetic characteristic.
Introduction
[phone]
Soft ferrite does not retain significant magnetization, whereas hard ferrite magnetization is considered permanent.
*
material for commercial
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• FAX: (888) FERRITE / [phone] • www.fair-rite.com • E-Mail: [e-mail]
[phone]
During the last 50 years the basic constituents of ferrites have
changed little, but purity of raw materials and process control
have improved dramatically. Ferrites are ceramic materials with
the general chemical formula MO.Fe
more divalent metal oxides blended with 48 to 60 mole percent
of iron oxide. Fair-Rite manufactures three broad groups of soft
ferrite materials:
Manganese zinc (Fair-Rite 31, 33, 73, 75, 76, 77 and 78 material)
Nickel zinc (Fair-Rite 42, 43, 44, 51, 61, 67 and 68 material)
Manganese (Fair-Rite 85 material)
Manganese zinc ferrites are completely vitrified and have very
low porosity. They have the highest permeabilities and exhibit
volume resistivities ranging from one hundred to several thou-
sand ohm-centimeter. Manganese zinc ferrite components are
used in tuned circuits and magnetic power designs from the low
kilohertz range into the broadcast spectrum. These ferrites have
a linear expansion coefficient of approximately 10 ppm/
The nickel zinc ferrites vary in porosity, and frequently contain
oxides of other metals, such as those of magnesium, man-
ganese, copper or cobalt. Volume resistivities range from sev-
eral kilohm-centimeter to tens of megohm-centimeter. In gener-
al, they are used at higher frequencies (above 1 MHz), and are
suitable for low flux density applications. Nickel zinc ferrites have
a linear expansion coefficient of approximately 8 ppm/
The manganese ferrite is a dense, temperature stable material
displaying a high degree of squareness in its hysteresis loop.
This makes this material uniquely suited for such applications as
multiple output control in switched-mode power supplies and
high frequency magnetic amplifiers.
As is evident from the flow diagram on page 3, there is consid-
erable processing involved, and the manufacturing cycle will
take a minimum of two weeks. The parts listed in the catalog
represent a broad cross section of the wide variety of cores
produced by Fair-Rite Products. Large OEM quantitites are
manufactured by Fair-Rite to order. Most of the more commonly
used parts are stocked by our distributors, offering prompt
deliveries. For a complete listing of our distributors visit our site
on the Internet at www.fair-rite.com.
Many of the parts produced by Fair-Rite are made to customer
specifications, and we welcome inquiries involving application-
specific designs. We have the capability to design tooling rapidly,
and have it fabricated either by our own tool shop or by outside
vendors.
P.O. Box J,One Commercial Row, Wallkill, NY 12589-0288
Note: (914) Area Code has changed to (845).
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14th Edition
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