D1787_15 Datasheet, PDF (1/2 Pages) Coilcraft lnc. – Shielded Power Inductor

Document 484-1
Shielded Power Inductor For National Semiconductor
LM5115 DC Controller IC

DCR SRF
Part   Inductance¹ max ^  typ²
number ±10% (µH) (mOhms) (MHz)
D1787-AL
33.0
2.8
9.0
  _Isat3   _Irms4
(A) (A)
8.0 23.0
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.
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.
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.
Temperature Rise vs Current
50
45
40
35
30
25
20
15
10
5
0
0
5
10
15
20
25
30
35
Current (A rms)
Document 484-1  Revised 09/10/15