Document 322-1 SMT Power Inductors – MSS1278 • 12.3 × 12.3 mm footprint; 8 mm high shielded inductors • Low DCR and excellent current handling Designer’s Kit C380 contains 3 each of all values. Core material Ferrite Core and winding loss See www.coilcraft.com/coreloss Terminations RoHS compliant matte tin over nickel over phos bronze. Other terminations available at additional cost. Weight: 3.8 – 4.6 g Ambient temperature –40°C to +85°C with Irms current, +85°C to +125°C with derated current Storage temperature Component: –40°C to +125°C. 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 500/13″ reel; Plastic tape: 24 mm wide, 0.4 mm thick, 16 mm pocket spacing, 8.1 mm pocket depth PCB washing Only pure water or alcohol recommended Part number1 MSS1278-142ML_ MSS1278-472ML_ MSS1278-562ML_ MSS1278-682ML_ MSS1278-822ML_ Inductance2 (µH) 1.4 ±20% 4.7 ±20% 5.6 ±20% 6.8 ±20% 8.2 ±20% DCR3 (mOhms) typ max Isat (A)5 Irms (A)6 SRF typ4 10% 20% 30% 20°C 40°C (MHz) drop drop drop rise rise 8.8 13.9 15.7 19.1 20.3 9.8 15.5 17.5 21.3 22.6 80.0 30.0 24.0 21.0 20.0 25.2 13.7 12.2 11.3 10.1 28.6 15.2 13.7 12.7 11.5 30.6 15.9 14.6 13.7 12.3 7.00 4.30 4.30 4.20 4.10 10.00 6.20 6.20 6.00 5.90 MSS1278-103ML_ MSS1278-123ML_ MSS1278-153ML_ MSS1278-183ML_ MSS1278-223ML_ 10 ±20% 12 ±20% 15 ±20% 18 ±20% 22 ±20% 21.8 23.2 27.9 30.8 35.5 24.3 25.8 31.0 34.3 39.5 17.0 15.0 13.0 12.0 11.0 9.36 10.6 11.2 8.84 10.0 10.7 7.30 8.36 9.00 6.10 7.10 7.74 6.04 6.78 7.24 4.00 3.70 3.50 3.00 2.90 5.70 5.20 4.90 4.50 4.00 MSS1278-273ML_ MSS1278-333ML_ MSS1278-393ML_ MSS1278-473ML_ MSS1278-563ML_ 27 ±20% 33 ±20% 39 ±20% 47 ±20% 56 ±20% 45.0 61.9 69.1 72.3 80.2 50.0 68.8 76.8 80.4 89.2 10.0 9.5 8.5 7.5 7.0 5.80 5.22 4.68 4.40 4.02 6.56 5.90 5.42 5.02 4.60 7.02 6.30 5.80 5.32 4.90 2.60 2.30 2.10 2.00 1.90 3.60 3.10 3.00 2.90 2.70 MSS1278-683ML_ MSS1278-823ML_ MSS1278-104ML_ MSS1278-124KL_ MSS1278-154KL_ 68 ±20% 82 ±20% 100 ±20% 120 ±10% 150 ±10% 91.3 125.9 135.1 182.3 216.5 101.5 139.9 150.2 202.6 240.6 6.5 5.0 4.5 4.3 4.1 3.40 3.12 2.88 2.62 2.48 3.86 3.58 3.28 3.00 2.86 4.26 3.80 3.52 3.24 3.02 1.80 1.60 1.50 1.40 1.30 2.60 2.30 2.20 1.90 1.80 MSS1278-184KL_ MSS1278-224KL_ MSS1278-274KL_ MSS1278-334KL_ MSS1278-394KL_ 180 ±10% 220 ±10% 270 ±10% 330 ±10% 390 ±10% 229.0 323.6 415.6 487.3 533.6 254.5 359.6 461.8 541.5 592.9 4.0 3.4 3.1 2.9 2.7 2.26 1.96 1.74 1.66 1.52 2.58 2.22 2.04 1.86 1.72 2.74 2.36 2.18 2.00 1.88 1.20 1.00 0.90 0.80 0.75 1.70 1.60 1.20 1.00 1.00 707.5 786.2 777.4 863.8 1045 1162 1166 1296 1334 1483 2.2 2.0 1.7 1.4 1.3 1.34 1.24 1.16 1.04 0.97 1.54 1.42 1.28 1.16 1.10 1.64 1.50 1.38 1.26 1.14 0.66 0.60 0.55 0.50 0.48 0.90 0.80 0.75 0.70 0.68 MSS1278-474KL_ 470 ±10% MSS1278-564KL_ 560 ±10% MSS1278-684KL_ 680 ±10% MSS1278-824KL_ 820 ±10% MSS1278-105KL_ 1000 ±10% 1. Please specify termination and packaging codes: MSS1278-105KLD Termination: L =RoHS compliant matte tin over nickel over phos bronze. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). Packaging: D=13″ machine-ready reel. EIA-481 embossed plastic tape (500 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 D instead. 2. Inductance tested at 100 kHz, 0.1 Vrms, 0 Adc using an Agilent/HP 4263B LCR meter or equivalent. 3. DCR measured on a micro-ohmmeter and a Coilcraft CCF858 test fixture. 4. SRF measured using an Agilent/HP 4191A or equivalent. 5. DC current at which the inductance drops the specified amount from its value without current. 6. Current that causes the specified temperature rise from 25°C ambient. 7. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 Document 322-1 Revised 12/01/08 Document 322-2 SMT Power Inductors – MSS1278 Typical L vs Current Typical L vs Frequency 10000 10000 1000 µH Inductance (µH) Inductance (µH) 100 µH 100 1000 µH 1000 1000 10 µH 10 100 µH 100 10 µH 10 4.7 µH 4.7 µH 1 1 0.1 10 1 100 0.01 10 Frequency (MHz) 0.484 max 12,3 Typical Current Derating 120 110 0.484 max 12,3 100 90 123 X Dash number Internal code Parts manufactured prior to Sept. 2007 were marked with only the dash number. 80 70 60 0.317 max 8,05 50 40 30 20 25°C Percent of rated current 1 0.1 Current (A) Isat Irms 10 0 -40 -20 0 0.197 5,0 20 40 60 80 100 120 140 Recommended Land Pattern 0.217 5,5 0.157 4,0 0.138 3,5 Ambient temperature (°C) 0.197 5,0 Dimensions are in 0.334 8,5 inches mm Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 0.025 0,635 Document 322-2 Revised 12/01/08