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© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
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Document 484-1
Document 484-1 Revised 09/10/15
The D1787-AL was developed for use with the National
Semiconductor LM5115 Secondary Side Post Regulator
Controller and LM5025 Primary Side Controller. This flat
wire power inductor offers extremely low dc resistance
and very high current ratings (up to 23 Arms). The flat
core allows for exceptional heat dissipation and provides
an excellent surface for pick and place operation.
This inductor is ideal for power supply applications where
high current handling is essential and is perfect for low-
voltage dc-dc converters. Custom inductance values are
also possible.
Request free evaluation samples by contacting Coilcraft
or visiting www.coilcraft.com.
DCR SRF
Part Inductance1 max typ2 Isat3 Irms4
number ±10% (µH) (mOhms) (MHz) (A) (A)
D1787-AL 33.0 2.8 9.0 8.0 23.0
Shielded Power Inductor
1. Inductance measured at 100 kHz, 0.1 Vrms, 0 Adc using Coilcraft
SMD-D fixture in Agilent/HP 4284A impedance analyzer.
2. SRF measured using Agilent/HP 8753D network analyzer and Coilcraft
SMD -D test fixture.
3. DC current at which the inductance drops 20% (typ) from its value with-
out current. Click for temperature derating information.
4. Current that causes a 40°C rise from 25°C ambient. This information is
for reference only and does not represent absolute maximum ratings.
Click for temperature derating information.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
50
25
30
35
40
45
20
15
10
0
5
Temperature rise (from 25°C)
Current (A rms)
0510 15 20 25 30 35
Temperature Rise vs Current
For National Semiconductor
LM5115 DC Controller IC
Core material Ferrite
Core and winding loss See www.coilcraft.com/coreloss
Terminations RoHS tin-silver (96.5/3.5) over copper
Weight 34.9 g
Ambient temperature –40°C to +85°C with (40°C rise) Irms current.
Maximum part temperature +125°C (ambient + temp rise). Derating.
Storage temperature Component: –40°C to +125°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 25 pieces per tray
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
SMT Power Inductor - D1787-AL
Document 484-2
Typical L vs Frequency Typical L vs Current
10
100
1000
0.1 1
100
10
Inductance (µH)
Frequency (MHz)
0.1 1
100
10
Current (A)
10
100
1000
Inductance (µH)
Document 484-2 Revised 09/10/15
Recommended
Land Pattern
0.004/0,102
D1787-AL
XXXXY
1.10
27,9 max
0.77
19,6
0.655
16,6
0.150
3,8
0.270
6,9
1.100
27,94
0.160
4,06
0.240
6,10
max
max
max
0.190
4,83
0.210
5,33
0.220
5,59
0.455
11,56
C
L
Partsmanufactured prior
to December 2011 may
be markeddifferently.
Dimensions are in inches
mm
