CM1394

Document 215 -1
IEEE 1394 Common Mode Choke
The CM1394 provides a low cost, high performance way
to virtually eliminate common mode noise from IEEE 1394
and other high-speed twisted pair interfaces.
It provides over 17 dB attenuation of common mode noise
at 400 MHz while differential mode signals extend out to
800 MHz before reaching the 3 dB point.
This shielded, 1812 size filter is machine wound, making
it less expensive than hand-wound toroid designs. It also
assures tighter tolerances between windings for excellent
impedance balance. Coilcraft’s CM1394 meets the IEEE
1.5 Amp Irms specification and has a maximum DCR of
0.105 Ohms.
To request free evaluation samples, contact Coilcraft or
visit www.coilcraft.com.
Part
number1
Inductance2
CM1394L_
0.22
min (µH)
DCR
max3
(Ohms)
0.105
Irms4
(Amps)
1.5
Insertion loss (dB) common mode/differential mode
100 MHz
200 MHz
400 MHz
500 MHz
9.04 / 0.19
13.66 / 0.94
17.75 / 1.79
17.11 / 2.09
1. When ordering, please specify packaging code:
CM1394LC
Packaging:C
=7″ machine-ready reel. EIA-481 embossed plastic
tape (600 parts per full reel).
B=Less than full reel. In tape, but not machine ready.
To have a leader and trailer added ($25 charge), use
code letter C instead.
D
=13″ machine-ready reel. EIA-481 embossed plastic
tape (2200 parts per full reel).
2. Inductance measured at 100 kHz.
3. DCR is for each winding
4. Current that causes a 15°C rise from 25°C ambient
5. Electrical specifications at 25°C
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Core material Ferrite
Terminations RoHS compliant gold over nickel over moly-manganese
Weight: 30 mg
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging 600/7″ reel; 2200/13″ reel Plastic tape: 12 mm wide,
0.25 mm thick, 8 mm pocket spacing, 3.9 mm pocket depth
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Document 215-1 Revised 01/26/05
Document 215 -2
IEEE 1394 Common Mode Choke
Frequency Response
Impedance vs Frequency
0
1000
Differential mode
Impedance (Ohms)
Attenuation (dB)
5
Common mode
10
15
20
100
10
1
0.01
0.1
1
B
E
4
10
100
Frequency (MHz)
1000
10000
1
10
100
1000
Frequency (MHz)
C
D
1
1
4
2
3
A F
H
G
0.015
0,38
1
0.020
0,51
2
0.048
1,22
4
0.057
1,45
0.115
2,92
Pad Detail
0.020
0,51
3
0.018
0,46
Recommended
Land Pattern
0.015 ref
0,38
0.040 min
1,02
0.030 ±0.002
0,76 ±0,05
A max B max C max D ref
E ref
F ref G min H
0.2310.1960.1500.107
0.1000.1780.040.03
5,874,983,812,72
2,544,52
1,02
0,76
Document 215-2 Revised 01/26/05
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