28B1250-000 Laird Technologies, 28B1250-000 Datasheet - Page 27

• Manufacturer Part Number: 28B1250-000
• Description: FERRITE TUBULAR BEAD 19.05MM
• Manufacturer: Laird Technologies
• Series: Stewardr

Specifications of 28B1250-000

• Filter Type: Round Cable, Solid
• Shape: Cylindrical
• Frequency: 100MHz
• Impedance: 186 Ohm
• Package / Case: 31.75mm O.D. x 19.05mm I.D. x 22.22mm L
• Test Frequency: 100 MHz
• Product: Ferrite Cores
• Maximum Dc Resistance: 186 Ohms
• Operating Temperature Range: - 40 C to + 125 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 240-2119

FERRITE EMI
www.lairdtech.com
FERRITE EMI CABLE CORES
EXAMPLE APPLICATION
Ferrite disks and plates provide a simple, cost-effective
solution for radiated and inductively-coupled electromagnetic
interference. After the PC board soldering process, a ferrite
disk or plate can be installed directly on the source of EMI
(such as active devices or unwanted antennas).
FEATURES:
• Easy installation • Each part for volume production is
provided with permanent, double sided 3,5 mil acrylic
adhesive with 218 oz. / inch2 adhesion. • Samples and
sample kits are available with removable and reusable
adhesive for “trial and error” testing • Variety of sizes offered
• Custom parts also available.
APPLICATIONS:
• Ferrite disks and plates can be utilized either as inductively
coupled components or EMI shields on PC board components
and traces. Inductive coupling occurs when the ferrite affects
the conducted wave form leaving the active component. The
rise time of the wave form is effectively slowed by the ferrite,
and the overshoot and associated ringing are attenuated.
EMI shielding occurs when the ferrite absorbs the radiated
emissions from active components, effectively protecting
other boards or components in the vicinity from radiated
contamination. • Can be used to locate unwanted EMI
antennas. • Flat flex & ribbon cables. • Can also provide
retrofit, auxiliary EMI attenuation.
EXAMPLE APPLICATION GRAPH
EXPLANATION:
The zero line on the graph represents the base line
noise recorded for an unprotected microprocessor. The
curve (dB down) represent the performance of the Laird
Technologies’ ferrite plate relative to the baseline. The
addition of the ferrite plates to the top of the processor
in this specific application exhibits up to a 5 dB EMI
reduction relative to the unprotected part. Performance
can vary with different sizes, materials, processors and
applications.
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0
1
1
MP1040-100
MP
HP
10
Frequency MHz
100
DISKS AND PLATES
1000
PART NUMBER SYSTEM EXAMPLE
M - Material
H - Material
PART NUMBER
MM0650-100
MM0787-100
MM0787-200
MM1400-200
MM1400-300
Disk
MP0315-200
MP0350-000
MP0433-000
MP0512-200
MP0590-200
MP0591-200
MP0760-100
MP1040-100
MP1040-200
MP1040-300
MP1496-000
H
M - Disk
P - Plate
M
(inches)
A mm
(0.650)
(0.787)
(0.787)
(1.400)
(1.400)
(0.315)
(1.040)
(0.433)
(0.512)
(0.827)
(0.591)
(0.760)
(1.040)
(1.040)
(1.040)
(1.496)
16.51
20.00
20.00
35.56
35.56
26.42
11.00
13.00
21.00
15.00
19.30
26.42
26.42
26.42
38.00
8.00
Indentification
Part Size
0787
(inches)
B mm
(0.315)
(0.350)
(0.433)
(0.512)
(0.591)
(0.591)
(0.760)
(1.040)
(1.040)
(1.040)
(1.496)
11.00
13.00
15.00
15.00
19.30
26.42
26.42
26.42
38.00
8.00
8.89
Plate
Thickness
Code
100
(inches)
C mm
(0.050)
(0.050)
(0.075)
(0.075)
(0.100)
(0.079)
(0.050)
(0.077)
(0.079)
(0.079)
(0.050)
(0.050)
(0.075)
(0.089)
(0.079)
0.079)
1.27
1.27
1.91
1.91
2.54
2.00
1.27
1.96
2.00
2.00
2.00
1.27
1.27
1.91
2.25
2.00
27