43
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!Note • 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.
■ 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
connection to ground.
The nickel barrier structure of the external
electrodes provides excellent solder heat resistance.
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.
■ Equivalent Circuit
(Resistance element becomes dominant
at high frequencies.)
BLM18R Series (0603 Size)
0.4±0.2
1.6±0.15
0.8±0.15
0.8±0.15
(in mm)
BLM18R Series
Part Number Impedance
(at 100MHz/20°C)
(ohm)
Rated Current
(mA) DC Resistance (max.)
(ohm)
Operating
Temperature Range
(°C)
BLM18RK121SN1 120 ±25% 200 0.25 -55 to +125
BLM18RK221SN1 220 ±25% 200 0.30 -55 to +125
BLM18RK471SN1 470 ±25% 200 0.50 -55 to +125
BLM18RK601SN1 600 ±25% 200 0.60 -55 to +125
BLM18RK102SN1 1000 ±25% 200 0.80 -55 to +125
■ Impedance-Frequency (Typical)
BLM18R Series
1200
900
600
300
01 10 100 1000
BLM18RK601SN1
BLM18RK471SN1
BLM18RK121SN1
BLM18RK102SN1
BLM18RK221SN1
Frequency (MHz)
Impedance (Ω)
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, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering.
!Note C31E13.pdf 05.3.14
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1
!Note • 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.
■ Impedance-Frequency Characteristics
BLM18RK121SN1
200
150
100
50
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM18RK221SN1
400
300
200
100
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM18RK471SN1
600
450
300
150
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM18RK601SN1
1000
750
500
250
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM18RK102SN1
1200
900
600
300
01 10 100 1000
Frequency (MHz)
Impedance (Ω)
Z
R
X
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, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering.
!Note C31E13.pdf 05.3.14
45
1
!Note • 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.
BLM21R Series (0805 Size)
2.0±0.2
0.5±0.2
1.25±0.2
EIA CODE : 0805 (in mm)
0.85±0.2
BLM21R Series
Part Number Impedance
(at 100MHz/20°C)
(ohm)
Rated Current
(mA) DC Resistance (max.)
(ohm)
Operating
Temperature Range
(°C)
BLM21RK121SN1 120 ±25% 200 0.15 -55 to +125
BLM21RK221SN1 220 ±25% 200 0.20 -55 to +125
BLM21RK471SN1 470 ±25% 200 0.25 -55 to +125
BLM21RK601SN1 600 ±25% 200 0.30 -55 to +125
BLM21RK102SN1 1000 ±25% 200 0.50 -55 to +125
■ Impedance-Frequency (Typical)
BLM21R Series
1200
900
600
300
01 10 100 1000
BLM21RK601SN1
BLM21RK471SN1
BLM21RK121SN1
BLM21RK102SN1
BLM21RK221SN1
Frequency (MHz)
Impedance (Ω)
■ Impedance-Frequency Characteristics
BLM21RK121SN1
200
150
100
50
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM21RK221SN1
300
225
150
75
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
Continued on the following page.
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, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering.
!Note C31E13.pdf 05.3.14
46
1
!Note • 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.
Continued from the preceding page.
■ Impedance-Frequency Characteristics
BLM21RK471SN1
600
450
300
150
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM21RK601SN1
1000
750
500
250
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
BLM21RK102SN1
1200
900
600
300
01 10 100 1000
Z
R
X
Frequency (MHz)
Impedance (Ω)
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, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering.
!Note C31E13.pdf 05.3.14
!Waveform Distortion Suppressing
Performance of BLM--R Series
Type of Filter
Initial
(No filter)
Resister (47Ω) is used
BLM18RK221SN1
(220Ω at 100MHz)
is used
EMI Suppression Effect / Description
Ringing is caused on the signal waveform.
Such ringing contains several hundred MHz harmonic components and generates noise.
[Measuring Circuits]
Signal waveform (100nsec/div, 2V/div) Expand (10nsec/div, 2V/div) Spectrum
Frequency (MHz)
30 30050 100 150 200 250
45
85
50
55
60
65
70
75
80
Level (dBµV)
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) Spectrum
Frequency (MHz)
30 30050 100 150 200 250
45
85
50
55
60
65
70
75
80
Level (dBµV)
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.
Signal waveform (100nsec/div, 2V/div) Expand (10nsec/div, 2V/div) Spectrum
Frequency (MHz)
30 30050 100 150 200 250
45
85
50
55
60
65
70
75
80
Level (dBµV)
AC04
Filter
Measuring Point
AC00
Pattern20cm
1MHz
EMI Suppression Effect
Noise Suppression Effect of BLM_R Series
47
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!Note • 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.
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, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering.
!Note C31E13.pdf 05.3.14
