Low Profile Surface Mount Common Mode Chokes
Laird Technologies’ monolithic 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 and high speed input/output circuitry (including network and storage subsystems).
Features:
•
Monolithic
•
Compact
•
High current carrying capability (up to 10 amps continuous)
•
Excellent high frequency
performance
•
Very low DCR to minimize circuit resistance
•
Smaller, lighter and less susceptible to vibration than
wire-wound chokes
•
Lead Free
•
Stable Impedance Under Load
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.
Common Mode
Impedance is the impedance of EMI noise
conducted in the same direction along two conductors.
Open Mode
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).
PART NUMBERING SYSTEM EXAMPLE
CM
Product Series
Code
3322
Part Size
Code
P
Rated Continuous
Current Code
400
Impedance Value
Code
R
Packaging
Code
-0
Additional
Description
Ambient Operating Temperature Range: -40°C to + 125°C
PART
NUMBER
CM3322P400R-10
CM3322U610R-10
CM3322X630R-10
CM1922X330R-10
Fig
#
1
1
1
2
See Data Curves on Back
C
mm
(inches)
2.10
(0.083)
2.10
(0.083)
2.85
(0.112)
2.85
(0.112)
A
mm
(inches)
8.50
(0.335)
8.50
(0.335)
8.50
(0.335)
4.70
(0.185)
B
mm
(inches)
5.60
(0.220)
5.60
(0.220)
5.60
(0.220)
5.60
(0.220)
D
mm
(inches)
2.24
(0.088)
2.24
(0.088)
2.24
(0.088)
2.24
(0.088)
IMPEDANCE (Z) OHMS @
Nominal
100 MHz
40
61
63
33
Typical
500 MHz
121
123
114
64
Typical
1 GHz
185
170
152
86
Typical
Peak
Impedance
(
W
)
251
191
165
93
Peak
Impedance
Frequency
(MHz)
1931
1581
1459
1783
DCR
MAX
(Ohms)
0.030
0.015
0.008
0.003
RATED
I MAX
(continuous)
mA
4000
7000
10000
10000
Recommended Lead Free
Soldering Conditions
250
[482]
Temperature (º C) [º F]
Pre-Heating
Soldering
Natural Cooling
Equivalent
Circuit
.88
[.074]
2.92
[.5]
Land Patterns
.9
[.075]
4
6.27
[.247]
130
[255]
60 Seconds
1
2
4
3
2
0.46
[.08]
6.53
[.257]
0.26
[.404]
6.35
[.250]
2.95
[.6]
0.46
[.08]
2.72
[.07]
6.53
[.257]
4
3
2
3
Figure #1
CM3322
60 Seconds
Figure #2
CM1922
100 Seconds
5 - 10 Seconds
www.lairdtech.com
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