Low Profile, Surface Mount
Common Mode Chokes
Steward’s
monolithic surface mount common mode chokes are designed for power and
data line EMI filtering where high current, small size or high frequency performance is
required. This family of compact ferrite parts provides EMI suppression on conductors
such as PC board traces (tracks) and high speed input/output circuitry (including network
and storage subsystems). These are the industry’s only true monolithic common mode
chokes.
Features:
·Monolithic ·Compact ·High
current carrying capability (up to 10 amps continuous)
·Excellent
ultra-high frequency performance
·Very
low DCR to minimize signal distortion
·Smaller,
lighter and less susceptible to vibration than old-style wire-wound chokes
Applications:
·Filtering
DC power on PC boards, especially in applications of greater than 3.0 amps
·Filtering
common mode EMI on high
speed data lines
·PCMCIA
products
·Filtering
for Bellcore Telecom applications
·Filtering
on USB power lines
·Disk
drives
Test Specifications:
·Maximum
current ratings are determined by testing to a maximum temperature rise of 40
o
C with continuous operating current.
·Board
level components are rated up to a maximum of 75 volts
·Part
performance is shown with curves for Common, Open and
Normal Mode Impedances measured along two conductors.
Common Mode
Impedance is the impedance of EMI noise conducted in
the same direction along two conductors.
Open Circuit
Impedance is the impedance measured across a single leg of the common
mode choke.
Normal Mode
Impedance is the total impedance to the differential circuit (both out and back).
Tested with:
·Agilent
E4991A (1MHz - 3.0 GHz) or HP8753 (to 6 GHz) Network/Spectrum Analyzer
·HP43961A
Impedance Test Kit
·HP16194A
Test Fixture or Inter-Continental Microwave custom fixtures
·HP16200A
DC Bias Adapter
·Philips
PM2811 DC Power
Supply
·Ambient
Temperature 23.5
o
C + 2
o
·Bandwidth
3 kHz
·Sweep
Time 423 ms
·Impedance
is rated at + 25% @100MHz
Ambient Operating Temperature Range: -55°C to + 125°C
See Curves on Back
PART
NUMBER
A
mm
(inches)
4.57 ± 0.25
(0.180 ± 0.010)
8.38 ± 0.25
(0.330 ± 0.010
8.38 ± 0.25
(0.330 ± 0.010)
4.70 ± 0.25
(0.185 ± 0.010)
B
mm
(inches)
3.05 ± 0.25
(0.120 ± 0.010)
3.05 ± 0.25
(0.120 ± 0.010)
5.60 ± 0.25
(0.220 ± 0.010)
5.60 ± 0.25
(0.220 ± 0.010)
C
mm
(inches)
1.16 ± 0.25
(0.064 ± 0.010
1.16 ± 0.25
(0.064 ± 0.010
3.23 ± 0.25
(0.127 ± 0.010)
3.23 ± 0.25
(0.127 ± 0.010)
D
mm
(inches)
0.76 ± 0.25
(0.030 ± 0.010)
0.76 ± 0.25
(0.030 ± 0.010))
0.76 ± 0.25
(0.030 ± 0.010)
0.76 ± 0.25
(0.030 ± 0.010)
IMPEDANCE ( Z )
TYPICAL OHMS @
100MHz 500MHz 1GHz
60
100
120
Peak
Impedance
Frequency
> 1 GHz
DCR
MAX
(
W
)
0.015
RATED
I
MAX
continuous
(mA)
7,000
CM1812U600R-00
CM3312N121R-00
120
200
250
> 1 GHz
0.035
3,000
CM3322T121R-00
120
220
240
@ 1 GHz
0.015
6,000
CM1922X600R-00
60
100
100
@ 1 GHz
0.008
10,000
Steward
www.steward.com
North America
- U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
North America
- Mexico • Phone: +52 662 260-4832 • Fax: +52 662 260-5074 • e-mail: mexico@steward.com
Europe
- Scotland, UK • Phone: +44 (0)1506 414200 • Fax +44 (0)1506 410694 • e-mail: europe@steward.com
Asia / Pacific
- Singapore • Phone: +65 6337 9667 • Fax +65 6 337 9686 • e-mail: asia@steward.com
BROCH#0041
6/2002 REV
1
140
120
100
CM1812U600R-00
Z,R,X
L
vs. Frequency
Impedance, Resistance, Inductive Reactance
Performance peaks at > 1 GHz
180
160
140
CM1812U600R-00
Z vs. Frequency
Open, Common Mode and Normal Mode
Normal
Impedance (W)
80
60
40
20
0
X
L
Z
R
Impedance (W)
120
100
Open
80
60
40
20
0
1
10
100
1000
10000
Common
1
10
100
1000
10000
Frequency (MHz)
CM3312N121R-00
Z,R,X
L
vs Frequency
Impedance, Resistance, Inductive Reactance
300
350
Frequency (MHz)
CM3312N121R-00
Z vs. Frequency
Open, Common Mode and Normal Mode
Performance peaks at 1 GHz
Normal
300
Impedance (W)
200
Z
R
Z
100
X
L
X
L
0
1
10
100
1000
R
Impedance (W)
200
Open
Common
100
10000
0
1
10
100
1000
10000
Frequency (MHz)
CM3322T121R-00
Z,R,X
L
vs. Frequency
Impedance, Resistance, Inductive Reactance
300
Frequency (MHz)
CM3322T121R-00
Z vs. Frequency
Open, Common Mode and Normal Mode
250
Performance peaks at 1 GHz
Normal
200
Open
Impedance (W)
200
Impedance (W)
150
Common
100
Z
100
R
X
L
50
01
10
100
1000
10000
0
Frequency (MHz)
CM1922X600R-00
Z,R,X
L
vs. Frequency
Impedance, Resistance, Inductive Reactance
140
1
10
100
1000
10000
Frequency (MHz)
CM1922X600R-00
Z vs. Frequency
Open, Common Mode and Normal Mode
180
Performance peaks at 1 GHz
120
100
80
60
40
20
01
X
L
Z
R
160
Normal
140
Impedance (W)
Impedance (W)
120
100
80
Common
60
40
20
Open
10
100
1000
10000
01
10
100
1000
10000
Frequency (MHz)
Frequency (MHz)
Steward
www.steward.com
North America
- U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
North America
- Mexico • Phone: +52 662 260-4832 • Fax: +52 662 260-5074 • e-mail: mexico@steward.com
Europe
- Scotland, UK • Phone: +44 (0)1506 414200 • Fax +44 (0)1506 410694 • e-mail: europe@steward.com
Asia / Pacific
- Singapore • Phone: +65 6337 9667 • Fax +65 6 337 9686 • e-mail: asia@steward.com
BROCH#0041
6/2002 REV
1
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