Datasheet

Chip Ferrite BeadChip EMIFILr
Chip Common Mode Choke Coil
Block Type EMIFILrMicrowave Absorber
!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
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C31E.pdf
09.4.20
13
R (Ω)
0
300
600
900
1200
1 10 100 1000
Frequency (MHz)
BLM18BD601SN1
BLM18AG601SN1
Z (Ω)
0
300
600
900
1200
1 10 100 1000
Frequency (MHz)
BLM18AG601SN1
BLM18BD601SN1
29.7cm
7cm
25MHz
OSC
74HC04 74HC04 74HC00
Difference between BLM A type and B type (HG type vs HD/HB type)
A type: Impedance curve rises from low frequency range. Suppress noise in wide frequency range.
B type: Impedance curve rises sharply. Less damage to signal waveforms.
cComparison of Impedance Curve
cComparison of Resistance Element
cComparison of Test Effect (25MHz)
Test Circuit
Waveform test point
1cm
Ferrite Bead
Pattern width 0.15cm
Line impedance 127Ω
Both side glass epoxy PCB(ε4.7)
All of back side is GND PCB thickness=0.6mm
BLM_B Series has less damage to high speed signal waveform.
Spectrum has been reduced from low
frequency range.
Noise frequency has been reduced without
reducing signals of low frequency.
Waveform
Spectrum
No filter BLM18AG601SN1 BLM18BD601SN1
Small Distortion
BLp Series Introduction