BNX025H01B Murata, BNX025H01B Datasheet - Page 90

• Manufacturer Part Number: BNX025H01B
• Manufacturer: Murata

Specifications of BNX025H01B

• Lead Free Status / RoHS Status: Supplier Unconfirmed

!Note
• This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our
• This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
sales representatives or product engineers before ordering.
!Note
4. Capacitive Noise Suppression
5. High frequency Capacitor Characteristics Used
6. Inductive Noise Suppression
88
Principles of Noise Suppression by DC EMIFILr
for EMI Suppression Filters
When a capacitor is connected (bypass capacitor) to
ground from a noisy signal line or power line, the circuit
impedance decreases as the frequency increases. Since
noise is a high frequency phenomenon, it flows to ground
if a capacitor has been connected to ground, thereby
making it possible to eliminate noise. (See Fig.)
EMI suppression filters employing a capacitor in this way
are used to eliminate this type of noise.
Even general-purpose capacitors can be used for noise
suppression. However, since noise has an extremely high
frequency range, general-purpose capacitors may not
function as effective bypass capacitors, due to the large
residual inductance built into the capacitor.
All the capacitors used in Murata's EMI suppression
filters employ a three terminal structure or thru-type
structure, which functions effectively even at high
frequencies, thereby minimizing the influence of residual
inductance. Consequently, an effective filter circuit can be
formed even at frequencies exceeding 1GHz.
(Refer to Fig.)
When an inductor is inserted in series in a noise
producing circuit (See Fig.), its impedance increases with
frequency. In this configuration it is possible to attenuate
and eliminate noise components (high frequency
components). The Murata EMI suppression filter
functions in this way.
Continued from the preceding page.
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
Capacitive Noise Suppression
Equivalent circuit of general-purpose capacitor and
three terminal capacitor in the high frequency area
and comparison of insertion loss
(a) Equivalent circuit of capacitors which concerns the ESL effect.
(b) Improvement of Insertion Loss Characteristics
Inductive Noise Suppression
Noise+Signal/DC Power
Noise+Signal/DC Power
10
20
30
40
50
60
70
80
0
1
10
Three terminal capacitor
Two terminal capacitor
Noise
C=22,000pF
C=22,000pF
Frequency (MHz)
100
Z =
Continued on the following page.
Z =
f : Frequency
c : Capacitance Value
2 fL
Noise
2 fc
f : Frequency
L : Inductance Value
1
1000
(50 ohm - 50 ohm)
Signal/DC Power
Signal/DC Power
10000
C50E.pdf
08.8.28