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Document 144-1
CombinationLineFilterChokes
Common and
Differential Mode
This series of chokes is intended for use in AC line filters
for switching power supplies.They combine common and
differential mode filtering in a single component.
By using these parts, designers can eliminate two extra fil-
ter chokes compared to a standard common mode choke.
The unique combination of special windings and materials
provides much better filtering performance than either a
common mode choke or a single winding inductor alone.
The differential filtering frequency response is designed
to provide filtering at higher frequencies while still allow-
ing the AC line power to pass through without loss. This
characteristic is demonstrated in the Differential Mode
Attenuation curves.
Part
number
P3717-AL
Q4007-AL
Q4018-AL
Common mode
impedance1
max (kOhms)
597.7 @ 0.19 MHz
301.9 @ 0.65 MHz
43.32 @ 1.2 MHz
Common mode
Differential mode
inductance1 inductance Irms2
typ (mH)
typ (µH)
(A)
25.0
4.5
1.5
1000
150
35
3.0
5.0
10
DCR max3
(Ohms)
0.30
0.06
0.02
Isolation4
(Vrms)
1500
1500
1500
1. Inductance measured at 15.75 kHz, 1.0 Vrms, 0 Adc.
2. Current that causes a 40°C temperature rise from 25°C ambient. This
information is for reference only and does not represent absolute maxi-
mum ratings.
3. DCR is specified per winding.
4. Isolation (hipot) measured for one minute.
5. Electrical specifications at 25°C.
Core material Ferrite
Terminations  RoHS compliant tin-silver over tin over copper.
Weight  100 – 113 g
Ambient temperature  –40°C to +85°C
Storage temperature  Component: –40°C to +85°C.
Tray packaging: –40°C to +80°C
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  30 per tray (after 5/09); 16 per tray (prior to 6/09)
PCB washing  Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
Document 144-1  Revised 09/13/17
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

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Document 144-2
Combination Line Filter Chokes
Typical Attenuation (Ref: 50 Ohms)
0
10
20
30 P3717-AL
Q4007-AL
40 Q4018-AL
50
60
70
80
90
0.1
Differential mode
Common mode
1.0 10
Frequency (MHz)
100
Typical Impedance
1000
100
P3717-AL
Q4007-AL
Q4018-AL
10
1
1.75
44,5
max
1.55
39,4
max
1.30
33,0
max
0.900
22,86
0.150 ±0.03
3,81 ±0,76
58
8
0.053 ±0.002
1,35 ±0,05
1
1.00
25,4
4
4
1.00
25,40
5
1
1
0.09
2,28
8
0.900
22,86
Recommended
PC Board Layout
14
85
Dimensions are
in
inches
mm
0.1
0.01
0.1
Differential mode
Common mode
1 10
Frequency (MHz)
100
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
Document 144-2  Revised 09/13/17
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.