document 621-1 document 621-1 revised 11/09/15 coupled inductors msd7342 dimensions are in inches mm for flyback, sepic, zeta and other applications ? tight coupling (k 0.97) and 200 v isolation make the msd7342 series of coupled inductors ideal for use in a variety of circuits including fyback, multi-output buck and sepic. ? they provide high inductance, high effciency and excellent current handling in a rugged, low cost part. ? can also be used as two single inductors connected in series or parallel, as a common mode choke or as a 1 : 1 transformer. 0.295 7,5 max 0.295 7,5 max max dot indicates pin 1 0.028 0,7 0.181 4,6 123 0.110 2,8 0.083 2,1 0.130 3,3 0.043 1,10 1 4 2 3 3 1 2 4 l1 l2 recommended land p attern 0.150 3,8 0.091 2,3 0.063 1,6 1 4 2 3 if board traces are ru ni n these areas , consider masking them to pre v ent shor ting. 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 specifcations subject to change without notice. please check our website for latest information.
document 621-2 document 621-2 revised 02/23/11 document 621-2 revised 11/09/15 coupling leakage i sat (a) 6 i rms (a) inductance 2 dcr max 3 srf typ 4 coeffcient l typ 5 10% 20% 30% both one part number 1 20% (h) (ohms) (mhz) typ (h) drop drop drop windings 7 winding 8 msd7342-252ml_ 2.5 0.033 55 0.97 0.14 6.0 6.2 6.3 2.17 3.06 msd7342-332ml_ 3.3 0.037 43 0.99 0.09 5.2 5.3 5.4 2.05 2.89 msd7342-472ml_ 4.7 0.051 35 0.99 0.11 4.1 4.3 4.6 1.74 2.46 msd7342-562ml_ 5.6 0.063 32 0.99 0.09 3.9 4.1 4.2 1.57 2.22 msd7342-682ml_ 6.8 0.070 30 0.99 0.14 3.7 3.8 3.9 1.49 2.10 msd7342-822ml_ 8.2 0.075 27 0.98 0.25 3.3 3.4 3.5 1.44 2.03 msd7342-103ml_ 10 0.100 22 0.98 0.30 2.8 2.9 3.0 1.24 1.76 msd7342-123ml_ 12 0.120 20 0.98 0.36 2.5 2.6 2.7 1.14 1.61 msd7342-153ml_ 15 0.130 18 0.98 0.49 2.2 2.3 2.4 1.09 1.54 msd7342-183ml_ 18 0.170 15 >0.99 0.16 2.0 2.2 2.3 0.95 1.35 msd7342-223ml_ 22 0.220 13.5 >0.99 0.20 1.9 2.0 2.1 0.84 1.19 msd7342-273ml_ 27 0.250 12.0 >0.99 0.20 1.7 1.8 1.9 0.79 1.11 msd7342-333ml_ 33 0.270 11.0 >0.99 0.15 1.5 1.6 1.7 0.76 1.07 msd7342-393ml_ 39 0.380 10.0 0.99 0.70 1.3 1.4 1.5 0.64 0.90 msd7342-473ml_ 47 0.420 9.5 >0.99 0.30 1.2 1.3 1.4 0.61 0.86 msd7342-563ml_ 56 0.460 8.7 >0.99 0.51 1.1 1.2 1.3 0.58 0.82 msd7342-683ml_ 68 0.600 7.3 >0.99 0.51 1.0 1.1 1.2 0.51 0.72 msd7342-823ml_ 82 0.680 6.2 0.99 1.17 0.90 1.00 1.1 0.48 0.67 msd7342-104ml_ 100 0.770 5.5 >0.99 0.96 0.80 0.92 0.98 0.45 0.63 msd7342-124ml_ 120 1.03 4.5 >0.99 0.61 0.70 0.80 0.90 0.39 0.55 msd7342-154ml_ 150 1.35 4.0 >0.99 0.54 0.65 0.76 0.80 0.34 0.48 msd7342-184ml_ 180 1.52 3.8 >0.99 0.75 0.62 0.66 0.73 0.32 0.45 msd7342-224ml_ 220 1.72 3.5 >0.99 1.43 0.59 0.62 0.66 0.30 0.42 msd7342-274ml_ 270 2.41 3.3 >0.99 1.56 0.55 0.57 0.60 0.25 0.36 msd7342-334ml_ 330 2.70 3.0 >0.99 1.65 0.49 0.52 0.54 0.24 0.34 msd7342-394ml_ 390 3.05 2.8 0.99 4.73 0.45 0.47 0.50 0.23 0.32 msd7342-474ml_ 470 4.00 2.6 0.99 5.50 0.41 0.43 0.46 0.20 0.28 msd7342-564ml_ 560 4.43 2.5 >0.99 4.85 0.38 0.40 0.42 0.19 0.26 msd7342-684ml_ 680 5.00 2.3 0.99 7.59 0.36 0.37 0.38 0.18 0.25 msd7342-824ml_ 820 6.80 2.2 >0.99 8.01 0.30 0.32 0.35 0.15 0.21 msd7342-105ml_ 1000 7.80 2.0 >0.99 8.69 0.27 0.29 0.31 0.14 0.20 1. when ordering, please specify termination and packaging codes: msd7342-105m lc 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: c = 7 machine-ready reel. eia-481 embossed plastic tape (250 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 c instead. d = 13 machine-ready reel. eia-481 embossed plastic tape. factory order only, not stocked (1000 parts per full reel). 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. 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 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. this information is for refer - ence only and does not represent absolute maximum ratings. to predict temperature rise go to online calculator . 8. maximum current when applied to one winding that causes a 40c temperature rise from 25c ambient. this information is for reference only and does not represent absolute maximum ratings. to predict temperature rise go to online calculator . 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 inductors C msd7342 series specifcations subject to change without notice. please check our website for latest information.
document 621-3 document 621-3 revised 02/23/11 document 621-3 revised 11/09/15 typical l vs current typical l vs frequency 1 10 100 1000 10000 0.01 0.1 10 1 current (a) inductance (h) 4.7 h 10 h 47 h 100 h 470 h 1000 h 1 10 100 1000 10000 0.1 1 100 10 frequency (mhz) inductance (h) 4.7 h 10 h 47 h 100 h 470 h 1000 h 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 0.76 C 0.87g ambient temperature C40c to +85c with (40c rise) i rms current. maximum part temperature +125c (ambient + temp rise). storage temperature component: C40c to +125c. tape and reel packaging: C40c to +80c winding to winding isolation 200 vrms 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 250/7 f reel; 1000/13 f reel plastic tape: 16 mm wide, 0.4 mm thick, 12 mm pocket spacing, 4.9 mm pocket depth pcb washing tested to mil-std-202 method 215 plus an additional aqueous wash. see doc787_pcb_washing.pdf . coupled inductors C msd7342 series specifcations subject to change without notice. please check our website for latest information.
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