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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 A rms). 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) 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. Temperature rise ro m 2 5°C) Current (Arms) 0 5 10 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.
SMT Power Inductor - D1787-AL Document 484-2 Typical L vs Frequency Typical L vs Current 100 1000 0.1 1 10010 Inductance (µH) Frequency (MHz) 0.1 1 10010 Current (A) 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 CL Parts manufactured prior to December 2011 may be marked differently. Dimensions are in inches mm