This is the PDF file of catalog No.C31E-6
C31E6.pdf 01.5.29
On-Board Type (DC) EMI Suppression Filters(EMIFILr)
Chip Ferrite Beads BLM15/BLM18/BLM21/BLM31/BLM41 Series
BLM15 Series(1005 Size)
0.25±0.1
1
1.0±0.1
0.5±0.1
in mm
Part Number
BLM15AG100PN1
BLM15AG700PN1
BLM15AG121PN1
BLM15AG221PN1
BLM15AG601PN1
BLM15AG102PN1
BLM15BB750PN1
BLM15BB121PN1
BLM15BB221PN1
BLM15BD421PN1
BLM15BD601PN1
BLM15BD102PN1
Impedance (at 100MHz)
(ohm)
10 (Typ.)
70 (Typ.)
120 (Typ.)
220
±25%
600
±25%
1000
±25%
75
±25%
120
±25%
220
±25%
420
±25%
600
±25%
1000
±25%
Rated Current
(mA)
500
200
200
100
50
50
100
50
50
50
50
50
DC Resistance(max.)
(ohm)
0.05
0.40
0.50
0.70
1.10
1.50
0.80
1.10
1.40
1.30
1.50
1.30
Operating Temperature Range
(°C)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
s
Equivalent Cirucit
s
Impedance-Frequency (Typical)
BLA15A Series
1200
AG102PN1
900
AG601PN1
Impedance (Ω)
AG221PN1
600
AG121PN1
AG700PN1
300
AG100PN1
(Resistance element becomes dominant
at high frequencies.)
0
1
10
100
Frequency (MHz)
1000
Continued on the following page.
29
0.5±0.1
This is the PDF file of catalog No.C31E-6
Continued from the preceding page.
C31E6.pdf 01.5.29
1
s
Impedance-Frequency Characteristics
BLM15AG100PN1
40
120
BLM15AG700PN1
30
Impedance (Ω)
Impedance (Ω)
90
Z
R
60
20
Z
R
X
30
10
X
0
1
10
100
Frequency (MHz)
1000
0
1
10
100
Frequency (MHz)
1000
BLM15AG121PN1
200
400
Z
150
R
Impedance (Ω)
Impedance (Ω)
300
BLM15AG221PN1
Z
R
200
100
X
50
100
X
0
1
10
100
Frequency (MHz)
1000
0
1
10
100
Frequency (MHz)
1000
BLM15AG601PN1
1000
1200
BLM15AG102PN1
Z
R
750
Z
Impedance (Ω)
Impedance (Ω)
900
R
500
600
250
X
300
X
0
1
10
100
Frequency (MHz)
1000
0
1
10
100
Frequency (MHz)
1000
s
Impedance-Frequency (Typical)
BLA15B Series
2000
1500
Impedance (Ω)
BD102PN1
BD601PN1
1000
BD421PN1
BB221PN1
BB121PN1
BB750PN1
500
0
1
10
100
Frequency (MHz)
1000
30
This is the PDF file of catalog No.C31E-6
C31E6.pdf 01.5.29
s
Impedance-Frequency Characteristics
BLM15BB750PN1
400
800
BLM15BB121PN1
1
300
Impedance (Ω)
Z
R
200
Impedance (Ω)
600
Z
400
R
X
100
X
200
0
1
10
100
Frequency (MHz)
1000
0
1
10
100
Frequency (MHz)
1000
BLM15BB221PN1
1200
1000
BLM15BD421PN1
900
Impedance (Ω)
Impedance (Ω)
Z
R
600
X
750
Z
R
500
X
300
250
0
1
10
100
Frequency (MHz)
1000
0
1
10
100
Frequency (MHz)
1000
BLM15BD601PN1
1600
2000
BLM15BD102PN1
1200
Impedance (Ω)
Z
Impedance (Ω)
R
800
1500
Z
R
1000
X
500
X
400
0
1
10
100
Frequency (MHz)
1000
0
1
10
100
Frequency (MHz)
1000
31
This is the PDF file of catalog No.C31E-6
C31E6.pdf 01.5.29
1
EMI Suppression Effect
Noise Suppression Effect of BLM_R Series
!Waveform
Distortion Suppressing
Performance of BLM--R Series
[Measuring Circuits]
Measuring Point
AC04
1MHz
Filter
Pattern 20cm
AC00
Type of Filter
EMI Suppression Effect / Description
Signal waveform (100nsec/div, 2V/div)
Expand (10nsec/div, 2V/div)
85
80
Level [dB
µV]
75
70
65
60
55
Spectrum
Initial
(No filter)
50
45
30 50
100
150
200
250
Frequency [MHz]
300
Ringing is caused on the signal waveform
Such ringing contains several hundred MHz harmonic components and generates noise.
Signal waveform (100nsec/div, 2V/div)
Expand (10nsec/div, 2V/div)
85
80
Level [dB
µV]
75
70
65
60
55
Spectrum
Resister (47Ω) is used
50
45
30 50
100
150
200
250
Frequency [MHz]
300
Comparing initial waveform, ringing is suppresed a little.
However there still remains high level waveform distortion.
Signal waveform (100nsec/div, 2V/div)
Expand (10nsec/div, 2V/div)
85
80
Level [dB
µV]
75
70
65
60
55
Spectrum
BLM18RK221SN1
(220Ω at 100MHz)
is used
50
45
30 50
100
150
200
250
Frequency [MHz]
300
BLM18R has excellent performance for noise suppression and waveform distortion suppression.
BLM18R suppresses drastically not only spectrum level in more than 100MHz range but waveform distortion.
54
This is the PDF file of catalog No.C31E-6
C31E6.pdf 01.5.29
Outlines of EMI Suppression Filter (EMIFILr) for DC Line
oChip
Ferrite Bead
oFerrite
Bead Inductor
Chip Ferrite Bead
.............P.24–65
Ferrite Bead Inductor
..........P.129–130
BLM15
BLM18
BLM21
BL01
BLA31
BL02RN1R3J2B
BL02RN2R3J2B
BLM31
BLM41
BL02RN1
BL02RN2R1M2B
BL03RN2R1M1B
"
Inductor type EMI suppression filters are effective for fre-
quencies ranging from a few MHz to a few GHz. Inductor
type filters are widely used as a low noise
countermeasure, as well as a universal noise
suppression component.
"
The inductor type EMIFILr produce a micro inductance in
the low frequency range. At high frequencies, however,
the resistive component of the inductor produces the
primary impedance. When inserted in series in the noise
producing circuit, the resistive impedance of the inductor
prevents noise propagation.
[Equivalent Circuit]
R(f)
[Impedance-Frequency Characteristics(typical)]
1000
800
Impedance [Ω]
600
Z
400
200
0
R
X
1
10
100
Frequency [MHz]
1000
R : Real Part (Resistive Portion)
X : Imaginary Part (Inductive Portion)
17
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