? coilcraft, inc. 2011 specifications subject to change without notice. please check our website for latest information. document 499-1 document 499-1 revised 02/22/11 coupled inductors C msd1278 tight coupling (k 0.94) and 500 v isolation make the msd1278 series of coupled inductors ideal for use in a variety of circuits including flyback, multi-output buck and sepic. these inductors provide high inductance, high efficiency and excellent current handling in a rugged, low cost part. they can also be used as two single inductors con- nected in series or parallel or as a common mode choke. dimensions are in inches mm for flyback, sepic and other applications designer?s kit c400 contains 3 each of all values. core material ferrite terminations rohs compliant matte tin over nickel over phos bronze. other terminations available at additional cost. weight: 3.7 ? 4.4 g ambient temperature ?40c to +85c with i rms current, +85c to +125c with derated current storage temperature component: ?40c to +125c. packaging: ?40c to +80c winding-to-winding and winding-to-core isolation 500 vrms resistance to soldering heat max three 40 second reflows at +260c, parts cooled to room temperature between cycles moisture sensitivity level (msl) 1 (unlimited floor 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, 0.4 mm thick, 16 mm pocket spacing, 8.1 mm pocket depth pcb washing only pure water or alcohol recommended 123 x recommended land pattern 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 number dot indicates pin1 internal 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 parts manufactured prior to sept. 2007 were marked with only the dash number. 0.317 8,05 max 3 1 2 4 l1 l2 11 : * for optional tin-lead and tin-silver-copper terminations, dimensions are for the mounted part. dimensions before mounting can be an additional 0.012 inch (0,3 mm). * l1 l2 + + ? ? d c c typical flyback converter v out v in sw l1 l2 ++ + ?? ? d d c c sw typical buck converter with auxiliary output typical sepic schematic v out v out v out aux v in v in l1 l2 q c1 c ++ ?? d
? coilcraft, inc. 2011 specifications subject to change without notice. please check our website for latest information. coupled inductors C msd1278 series document 499-2 revised 02/22/11 document 499-2 coupling leakage i rms (a) part inductance 2 dcr max 3 srf typ 4 coefficient inductance 5 i sat 6 both one number 1 (h) (ohms) (mhz) typ typ (h) (a) windings 7 winding 8 msd1278-472ml_ 4.7 20% 0.038 32.0 0.94 0.22 14.9 3.16 4.47 msd1278-562ml_ 5.6 20% 0.046 25.0 0.94 0.23 13.4 2.87 4.06 msd1278-682ml_ 6.8 20% 0.048 24.0 0.94 0.22 13.1 2.81 3.98 msd1278-822ml_ 8.2 20% 0.050 18.0 0.94 0.34 10.8 2.76 3.90 msd1278-103ml_ 10 20% 0.058 16.5 0.94 0.34 10.5 2.56 3.62 msd1278-123ml_ 12 20% 0.062 14.5 0.94 0.36 9.6 2.48 3.50 msd1278-153ml_ 15 20% 0.072 11.8 0.94 0.41 9.1 2.30 3.25 msd1278-183ml_ 18 20% 0.080 10.5 0.94 0.37 8.0 2.18 3.08 msd1278-223ml_ 22 20% 0.096 9.0 0.94 0.41 6.8 1.99 2.81 msd1278-273ml_ 27 20% 0.120 8.4 0.94 0.43 6.5 1.78 2.52 msd1278-333ml_ 33 20% 0.150 7.6 0.94 0.56 5.6 1.59 2.25 msd1278-393ml_ 39 20% 0.160 6.5 0.94 0.64 5.5 1.54 2.18 msd1278-473ml_ 47 20% 0.180 6.0 0.94 0.70 5.2 1.45 2.05 msd1278-563ml_ 56 20% 0.190 5.6 0.98 0.76 4.5 1.41 2.00 msd1278-683ml_ 68 20% 0.210 5.0 0.98 0.88 4.1 1.35 1.90 msd1278-823ml_ 82 20% 0.280 4.1 0.98 0.85 3.8 1.16 1.65 msd1278-104ml_ 100 20% 0.300 3.6 0.98 0.90 3.4 1.13 1.59 msd1278-124kl_ 120 10% 0.410 3.2 0.98 1.31 3.2 0.96 1.36 msd1278-154kl_ 150 10% 0.460 3.0 0.98 1.46 2.8 0.91 1.29 msd1278-184kl_ 180 10% 0.510 2.7 0.98 0.93 2.5 0.86 1.22 msd1278-224kl_ 220 10% 0.690 2.5 0.98 1.54 2.3 0.74 1.05 msd1278-274kl_ 270 10% 0.900 2.1 0.98 1.17 2.1 0.65 0.92 msd1278-334kl_ 330 10% 1.02 2.0 0.98 4.14 1.9 0.61 0.86 msd1278-394kl_ 390 10% 1.12 1.8 0.98 1.64 1.7 0.58 0.82 msd1278-474kl_ 470 10% 1.43 1.6 0.98 0.25 1.6 0.50 0.70 msd1278-564kl_ 560 10% 1.69 1.5 0.98 2.68 1.5 0.47 0.67 msd1278-684kl_ 680 10% 2.29 1.4 0.98 2.11 1.3 0.41 0.58 msd1278-824kl_ 820 10% 2.55 1.3 0.98 2.39 1.2 0.39 0.55 msd1278-105kl_ 1000 10% 2.83 1.1 0.98 4.28 1.1 0.37 0.52 1. when ordering, please specify termination and packaging code: msd1278-105k 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 30% (typ) from its value without current. it is the sum of the current flowing 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 specifications at 25c. refer to doc 639 ?selecting coupled inductors for sepic applications.? refer to doc 362 ?soldering surface mount components? before soldering. temperature rise calculation based on specified i rms temperature rise ( t) = winding power loss 52.6c w t = 52.6c w ( + ) dcr ii l1 2 l2 2 winding power loss = ( + ) dcr in watts (w) ii l1 2 l2 2 example 1. msd1278-153ml (equal current in each winding) winding power loss = (2.3 + 2.3 ) 0.072 = 0.761 w t = 0.761 w 52.6c w = 40c 22 example 2. ( = 2.4 a, winding p msd1278-153ml = 1.3 a) ii l1 l2 22 ower loss = (2.4 + 1.3 ) 0.072 = 0.536 w t = 0.536 w 52.6c w = 28.2c 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. visit www.coilcraft.com/coupledloss.
? coilcraft, inc. 2011 specifications subject to change without notice. please check our website for latest information. coupled inductors C msd1278 series document 499-3 revised 02/22/11 document 499-3 typical l vs frequency typical l vs current 1 10 100 1000 10000 0.01 0.1 10 1 inductance (h) frequency (mhz) -104 -103 -472 -473 -105 -474 1 10 100 1000 10000 0.1 1 100 10 inductance (h) current (a) -104 -103 -472 -473 -105 -474 -40 -20 0 20 40 60 80 100 140 120 ambient temperature (c) percent of rated current 120 110 100 90 80 70 60 50 40 30 20 10 0 i sat i rms 25c current derating
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