(for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
!Note
•Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
•This catalog has only typical specifications. Therefore,thereareno space for detailed specifications. Therefore, please approve our productsheet for product specifications before ordering. product specifications before ordering.
This catalog has only typical specifications because you is requested to approve our product specifications or to transact the approval specifications or transact the approval sheet for
C31E13.pdf 05.3.14
s
Features (BLM_R Series)
The chip ferrite beads BLM series is designed to
function nearly as a resistor at noise frequencies,
which greatly reduces the possibility of resonance and
leaves signal wave forms undistorted.
The BLM series is effective in circuits without stable
ground lines because the BLM series does not need a
The BLM_R series can be used in a digital Interface.
Resistance of BLM_R series especially grows in the
lower frequency range. Therefore BLM_R series is less
effective for digital signal waveform at low frequency
range and can suppress the ringing.
s
Equivalent Circuit
1
(Resistance element becomes dominant
at high frequencies.)
BLM18R Series (0603 Size)
0.4±0.2
1.6±0.15
0.8±0.15
BLM18R Series
(in mm)
Part Number
BLM18RK121SN1
BLM18RK221SN1
BLM18RK471SN1
BLM18RK601SN1
BLM18RK102SN1
Impedance
(at 100MHz/20°C)
(ohm)
120
±25%
220
±25%
470
±25%
600
±25%
1000
±25%
Rated Current
(mA)
200
200
200
200
200
DC Resistance (max.)
(ohm)
0.25
0.30
0.50
0.60
0.80
Operating
Temperature Range
(°C)
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
s
Impedance-Frequency (Typical)
BLM18R Series
1200
BLM18RK601SN1
900
Impedance (Ω)
BLM18RK471SN1
BLM18RK221SN1
BLM18RK121SN1
600
BLM18RK102SN1
300
0
1
10
Frequency (MHz)
100
1000
43
0.8±0.15
Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
!Note
•Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
•This catalog has only typical specifications. Therefore,thereareno space for detailed specifications. Therefore, please approve our productsheet for product specifications before ordering. product specifications before ordering.
This catalog has only typical specifications because you is requested to approve our product specifications or to transact the approval specifications or transact the approval sheet for
C31E13.pdf 05.3.14
s
Impedance-Frequency Characteristics
BLM18RK121SN1
200
400
BLM18RK221SN1
150
Impedance (Ω)
Z
100
R
Impedance (Ω)
300
Z
200
R
1
50
X
100
X
0
1
10
Frequency (MHz)
100
1000
0
1
10
Frequency (MHz)
100
1000
BLM18RK471SN1
600
1000
Z
450
R
Impedance (Ω)
Impedance (Ω)
750
BLM18RK601SN1
Z
R
300
500
150
X
250
X
0
1
10
Frequency (MHz)
100
1000
0
1
10
Frequency (MHz)
100
1000
BLM18RK102SN1
1200
900
R
Impedance (Ω)
Z
600
X
300
0
1
10
Frequency (MHz)
100
1000
44
Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
!Note
•Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
•This catalog has only typical specifications. Therefore,thereareno space for detailed specifications. Therefore, please approve our productsheet for product specifications before ordering. product specifications before ordering.
This catalog has only typical specifications because you is requested to approve our product specifications or to transact the approval specifications or transact the approval sheet for
C31E13.pdf 05.3.14
BLM21R Series (0805 Size)
0.5±0.2
0.85±0.2
2.0±0.2
1.25±0.2
1
BLM21R Series
EIA CODE : 0805
(in mm)
Part Number
BLM21RK121SN1
BLM21RK221SN1
BLM21RK471SN1
BLM21RK601SN1
BLM21RK102SN1
Impedance
(at 100MHz/20°C)
(ohm)
120
±25%
220
±25%
470
±25%
600
±25%
1000
±25%
Rated Current
(mA)
200
200
200
200
200
DC Resistance (max.)
(ohm)
0.15
0.20
0.25
0.30
0.50
Operating
Temperature Range
(°C)
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
s
Impedance-Frequency (Typical)
BLM21R Series
1200
BLM21RK601SN1
900
Impedance (Ω)
BLM21RK471SN1
BLM21RK221SN1
BLM21RK121SN1
600
BLM21RK102SN1
300
0
1
10
Frequency (MHz)
100
1000
s
Impedance-Frequency Characteristics
BLM21RK121SN1
200
300
BLM21RK221SN1
Z
150
Z
Impedance (Ω)
R
100
Impedance (Ω)
225
R
150
50
X
75
X
0
1
10
Frequency (MHz)
100
1000
0
1
10
Frequency (MHz)
100
1000
Continued on the following page.
45
Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
!Note
•Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
•This catalog has only typical specifications. Therefore,thereareno space for detailed specifications. Therefore, please approve our productsheet for product specifications before ordering. product specifications before ordering.
This catalog has only typical specifications because you is requested to approve our product specifications or to transact the approval specifications or transact the approval sheet for
C31E13.pdf 05.3.14
Continued from the preceding page.
s
Impedance-Frequency Characteristics
BLM21RK471SN1
600
1000
BLM21RK601SN1
Z
450
Impedance (Ω)
Impedance (Ω)
R
750
Z
500
R
300
1
150
X
250
X
0
1
10
Frequency (MHz)
100
1000
0
1
10
Frequency (MHz)
100
1000
BLM21RK102SN1
1200
900
Z
Impedance (Ω)
R
600
X
300
0
1
10
Frequency (MHz)
100
1000
46
Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
!Note
•Please read rating and
!CAUTION
(for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
•This catalog has only typical specifications. Therefore,thereareno space for detailed specifications. Therefore, please approve our productsheet for product specifications before ordering. product specifications before ordering.
This catalog has only typical specifications because you is requested to approve our product specifications or to transact the approval specifications or transact the approval sheet for
C31E13.pdf 05.3.14
EMI Suppression Effect
!Waveform
Distortion Suppressing
Performance of BLM--R Series
Noise Suppression Effect of BLM_R Series
[Measuring Circuits]
Measuring Point
AC04
1MHz
Filter
Pattern 20cm
AC00
1
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 suppressed 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.
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