document 704-1 document 704-1 revised 04/05/13 dimensions are in inches mm 123 x recommended land p attern 0.197 5,0 0.059 1,5 0.197 5,0 0.138 3,5 0.484 12,3 max 0.484 12,3 max dash n umber dot indicates pin1 inter nal code 1 4 2 3 0.217 5,5 0.177 4,5 0.157 4,0 0.079 2,0 1 4 2 3 0.308 0.010 7,8 0,25 3 1 2 4 l1 l2 * fo r optional tin-lead and tin-silv er-copper ter minations , dimensions are fo r the mounted par t. dimensions bef ore mounting can be an additional 0.012 inch (0,3 mm). * coupled inductors msd1278t for high temperature applications the msd1278t series of shielded coupled inductors was designed specifcally for high temperature applications C up to 125c ambient. tight coupling (k 0.98) and 500 v isolation make them ideal for use in a variety of circuits including fyback, multi- output buck, sepic and zeta. these parts provide high inductance, high effciency and excellent current handling. they can also be used as two single inductors connected in series or parallel or as a common mode choke. l1 l2 + + ? ? d c c t ypical fl ybac k co n ver ter v out v in sw l1 l2 ++ + ?? ? d d c c sw t ypical buc k con ver ter with auxiliary output v out v out au x v in t ypical zeta schematic v out v in l1 l2 q c1 cc ++ ?? d t ypical sepic schematic v out v in l1 l2 q c1 c c ++ ?? d us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.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. 2016 this pr oduct 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.
document 704-2 revised 04/05/13 document 704-2 dcr srf coupling leakage i sat (a) 6 i rms (a) inductance 2 max 3 typ 4 coeffcient l typ 5 10% 20% 30% both one part number 1 (h) (ohms) (mhz) typ (h) drop drop drop windings 7 winding 8 msd1278t-472ml_ 4.7 20% 0.040 33.0 0.98 0.22 13.90 15.20 16.36 3.16 4.47 msd1278t-562ml_ 5.6 20% 0.046 30.0 0.98 0.23 13.38 14.86 15.74 2.87 4.06 msd1278t-682ml_ 6.8 20% 0.048 23.0 0.98 0.22 12.10 13.56 14.20 2.81 3.98 msd1278t-822ml_ 8.2 20% 0.055 20.0 0.98 0.34 10.30 11.52 12.20 2.76 3.90 msd1278t-103ml_ 10 20% 0.058 17.0 0.98 0.34 8.80 10.00 10.66 2.56 3.62 msd1278t-123ml_ 12 20% 0.062 15.0 0.98 0.36 8.20 9.18 9.74 2.48 3.50 msd1278t-153ml_ 15 20% 0.072 13.0 0.99 0.41 7.40 8.36 9.03 2.30 3.25 msd1278t-183ml_ 18 20% 0.080 12.0 0.99 0.37 6.50 7.38 7.86 2.18 3.08 msd1278t-223ml_ 22 20% 0.096 11.0 0.99 0.41 6.00 6.80 7.26 1.99 2.81 msd1278t-273ml_ 27 20% 0.120 10.0 0.99 0.43 5.80 6.56 7.02 1.78 2.52 msd1278t-333ml_ 33 20% 0.150 9.5 0.99 0.56 5.50 6.10 6.52 1.59 2.25 msd1278t-393ml_ 39 20% 0.161 8.5 0.99 0.64 4.70 5.26 5.60 1.54 2.18 msd1278t-473ml_ 47 20% 0.180 7.5 0.99 0.70 3.70 4.34 4.60 1.45 2.05 msd1278t-563ml_ 56 20% 0.190 7.0 0.99 0.76 3.60 4.18 4.50 1.41 2.00 msd1278t-683ml_ 68 20% 0.210 6.5 0.99 0.88 3.50 4.04 4.32 1.35 1.90 msd1278t-823ml_ 82 20% 0.280 5.0 0.99 0.85 3.30 3.72 4.02 1.16 1.65 msd1278t-104ml_ 100 20% 0.300 4.5 >0.99 0.90 2.80 3.24 3.46 1.13 1.59 msd1278t-124kl_ 120 10% 0.410 4.3 0.99 1.31 2.60 2.94 3.16 0.96 1.36 msd1278t-154kl_ 150 10% 0.460 4.1 >0.99 1.46 2.20 2.54 2.70 0.91 1.29 msd1278t-184kl_ 180 10% 0.510 4.0 >0.99 0.93 2.10 2.42 2.58 0.86 1.22 msd1278t-224kl_ 220 10% 0.690 3.4 >0.99 1.54 1.90 2.16 2.28 0.74 1.05 msd1278t-274kl_ 270 10% 0.900 3.1 >0.99 1.17 1.70 1.94 2.10 0.65 0.92 msd1278t-334kl_ 330 10% 1.02 2.9 0.99 4.14 1.50 1.70 1.84 0.61 0.86 msd1278t-394kl_ 390 10% 1.12 2.7 >0.99 1.64 1.40 1.60 1.70 0.58 0.82 msd1278t-474kl_ 470 10% 1.53 2.2 >0.99 0.25 1.30 1.50 1.60 0.50 0.70 msd1278t-564kl_ 560 10% 1.69 2.0 >0.99 2.68 1.20 1.34 1.46 0.47 0.67 msd1278t-684kl_ 680 10% 2.29 1.7 >0.99 2.11 1.00 1.08 1.22 0.41 0.58 msd1278t-824kl_ 820 10% 2.55 1.4 >0.99 2.39 0.900 1.04 1.18 0.39 0.55 msd1278t-105kl_ 1000 10% 2.87 1.3 >0.99 4.28 0.850 0.948 1.05 0.37 0.52 1. when ordering, please specify termination and packaging code: msd1278t-105k ld 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 shown for each winding, measured at 100 khz, 0.1 vrms, 0 adc on an agilent/hp 4284a lcr meter or equivalent. when leads are connected in parallel, inductance is the same value. when leads are connected in series, inductance is four times the value. 3. dcr is for each winding. when leads are connected in parallel, dcr is half the value. when leads are connected in series, dcr is twice the value. 4. srf measured using an agilent/hp 4191a or equivalent. when leads are connected in parallel, srf is the same value. 5. leakage inductance is for l1 and is measured with l2 shorted. 6. dc current, at which the inductance drops the specifed amount from its value without current. it is the sum of the current fowing in both windings. 7. equal current when applied to each winding simultaneously that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 8. maximum current when applied to one winding that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 9. electrical specifcations at 25c. refer to doc 639 selecting coupled inductors for sepic applications. refer to doc 362 soldering surface mount components before soldering. coupled inductor core and winding loss calculator this web-based utility allows you to enter frequency, peak-to-peak (ripple) current, and i rms current to predict temperature rise and overall losses, including core loss. go to online calculator . core material ferrite core and winding loss go to online calculator terminations rohs compliant matte tin over nickel over phos bronze. other terminations available at additional cost. weight: 3.7 C 4.4 g ambient temperature C40c to +125c with i rms current maximum part temperature +165c (ambient + temp rise) storage temperature component: C40c to +165c. tape and reel packaging: C40c to +80c winding-to-winding isolation 500 vrms, one minute resistance to soldering heat max three 40 second refows at +260c, parts cooled to room temperature between cycles moisture sensitivity level (msl) 1 (unlimited foor life at <30c / 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, 0.5 mm thick, 16 mm pocket spacing, 8.7 mm pocket depth pcb washing tested with pure water or alcohol only. for other solvents, see doc787_pcb_washing.pdf . us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.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. 2016 this pr oduct 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. high temperature coupled inductors C msd1278t
document 704-3 revised 04/05/13 document 704-3 typical l vs frequency typical l vs current 1 10 100 1000 10000 0.01 0.1 10 1 inductance (h) frequency (mhz) 100 h 47 h 10 h 4.7 h 1000 h 470 h 1 10 100 1000 10000 0.1 1 100 10 inductance (h) current (a) 100 h 47 h 10 h 4.7 h 1000 h 470 h us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.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. 2016 this pr oduct 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. high temperature coupled inductors C msd1278t
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