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 DCR Inductance2 (mOhms) (µH) typ max 3 Isat (A)5 Irms (A)6 SRF typ4 10% 20% 30% 20°C40°C (MHz) dropdrop drop rise rise MSS1278-142ML_ 1.4 ±20% MSS1278-472ML_ 4.7 ±20% MSS1278-562ML_ 5.6 ±20% MSS1278-682ML_ 6.8 ±20% MSS1278-822ML_ 8.2 ±20% 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 MSS1278-103ML_ 10 ±20% MSS1278-123ML_ 12 ±20% MSS1278-153ML_ 15 ±20% MSS1278-183ML_ 18 ±20% MSS1278-223ML_ 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 MSS1278-273ML_ 27 ±20% MSS1278-333ML_ 33 ±20% MSS1278-393ML_ 39 ±20% MSS1278-473ML_ 47 ±20% MSS1278-563ML_ 56 ±20% 45.0 61.9 69.1 72.3 80.2 50.0 10.0 68.8 9.5 76.8 8.5 80.4 7.5 89.2 7.0 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 7.0010.00 4.30 6.20 4.30 6.20 4.20 6.00 4.10 5.90 9.3610.6 11.2 8.8410.0 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 5.80 5.22 4.68 4.40 4.02 2.60 2.30 2.10 2.00 1.90 3.60 3.10 3.00 2.90 2.70 6.56 5.90 5.42 5.02 4.60 7.02 6.30 5.80 5.32 4.90 MSS1278-683ML_ 68 ±20% MSS1278-823ML_ 82 ±20% MSS1278-104ML_ 100 ±20% MSS1278-124KL_ 120 ±10% MSS1278-154KL_ 150 ±10% 91.3 101.5 125.9 139.9 135.1150.2 182.3202.6 216.5240.6 6.5 5.0 4.5 4.3 4.1 3.40 3.86 4.26 1.80 2.60 3.12 3.58 3.80 1.60 2.30 2.883.283.521.502.20 2.623.003.241.401.90 2.482.863.021.301.80 MSS1278-184KL_ 180 ±10% MSS1278-224KL_ 220 ±10% MSS1278-274KL_ 270 ±10% MSS1278-334KL_ 330 ±10% MSS1278-394KL_ 390 ±10% 229.0254.5 323.6359.6 415.6461.8 487.3541.5 533.6592.9 4.0 3.4 3.1 2.9 2.7 2.262.582.741.201.70 1.962.222.361.001.60 1.742.042.180.901.20 1.661.862.000.801.00 1.521.721.880.751.00 MSS1278-474KL_ 470 ±10% 707.5786.2 MSS1278-564KL_ 560 ±10% 777.4863.8 MSS1278-684KL_ 680 ±10% 1045 1162 MSS1278-824KL_ 820 ±10% 1166 1296 MSS1278-105KL_1000 ±10%1334 1483 2.2 2.0 1.7 1.4 1.3 1.341.541.640.660.90 1.241.421.500.600.80 1.161.281.380.550.75 1.041.161.260.500.70 0.971.101.140.480.68 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. EIA481 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. Document 322-1 Revised 08/18/11 Document 322-2 SMT Power Inductors – MSS1278 Typical L vs Current Typical L vs Frequency 10000 10000 1000 µH 100 µH 100 10 µH 10 1 1000 µH 1000 Inductance (µH) Inductance (µH) 1000 10 µH 10 4.7 µH 0.1 100 µH 100 10 1 100 Current (A) 4.7 µH 1 0.01 0.1 1 Frequency (MHz) 10 Typical Current Derating 100 90 80 70 60 50 40 30 20 10 0 25°C Percent of rated current 120 110 Isat Irms -40 -20 0 20 40 60 80 100 120 140 Ambient temperature (°C) Dimensions are in inches mm Document 322-2 Revised 08/18/11