BLM21xxx Murata Electronics, BLM21xxx Datasheet - Page 2

• Manufacturer Part Number: BLM21xxx
• Description: On-Board Type EMI Suppression Filter / Chip Ferrite Beads
• Manufacturer: Murata Electronics

1
!Note
!Note
Essential for Noise Suppression in High Speed Signal
Lines and DC Power Lines
The chip ferrite bead BLM series comprises ferrite beads in
the shape of a chip. This ferrite bead generates a high
impedance which at high frequencies mainly consists of a
resistance element. The BLM series is effective in circuits
without stable ground lines because the BLM series does
not need a connection to ground.
!Features
The BLM series comprises the R series (for digital interface),
the A series (for standard), the B series (for high speed
signal), the P series (for large current), and the H/E/G series
(for GHz range noise suppression).
1. BLM--R series – For Digital Interface
2. BLM--A/T series – For Standard
14
Chip Ferrite Bead BLM Series
On-Board Type (DC) EMI Suppression Filters (EMIFILr)
[Impedance Characteristics]
The BLM-R series can be used in 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.
The BLM-A series generates an impedance from the
relatively low frequencies. Therefore the BLM-A series is
effective in noise suppression in the wide frequency
range (30MHz – several hundred MHz).
• 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.
1800
1500
1200
900
600
300
0
1
BLM18RK102SN1
10
BLM18BD102SN1
Frequency (MHz)
Chip sizes of 0.6x0.3, 1.0x0.5, 1.6x0.8, 2.0x1.25, 3.2x1.6
and 4.5x1.6mm are cataloged. (The BLA series of array
type chip ferrite beads is also cataloged.)
The nickel barrier structure of the external electrodes
provides excellent solder heat resistance.
3. BLM--B series – For High Speed Signal
4. BLM--P series – For Large Current
5. BLM--H/E/G series – For GHz Range Noise Suppression
The BLM-B series can minimize attenuation of the signal
waveform due to its sharp impedance characteristics.
Various impedances are available to match signal
frequency.
The BLM-P series can be used in high current circuits
due to its low DC resistance. It can match power lines to
a maximum of 6A DC (BLM41P).
The BLM--H/E/G series has a modified internal
electrode structure that minimizes stray capacitance and
increases the effective frequency range.
BLM18AG102SN1
100
BLM18HG102SN1
1000
C31E12.pdf 04.8.30