? coilcraft, inc. 2010 specifications subject to change without notice. please check our website for latest information. document 621-1 document 621-1 revised 11/10/09 coupled inductors C msd7342 series the excellent coupling coefficient (k 0.94) makes the msd7342 series of coupled inductors ideal for use in sepic applications. in sepic topologies, the required inductance for each winding in a coupled inductor is half the value needed for two separate inductors, allow- ing selection of a part with lower dcr and higher current handling. 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, as a common mode choke or as a 1 : 1 transformer. dimensions are in inches mm core material ferrite terminations rohs compliant matte tin over nickel over phos bronze. other terminations available at additional cost. weight 0.76 ? 0.87g 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 isolation 200 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 250/7 reel; 1000/13 reel plastic tape: 16 mm wide, 0.4 mm thick, 12 mm pocket spacing, 4.9 mm pocket depth pcb washing only pure water or alcohol recommended for sepic applications l1 l2 q1 c1 c2 + ++ ?? d1 v out v in load typical sepic schematic refer to application note, document 639, ?selecting coupled inductors for sepic applications.? visit http://www.coilcraft.com/apps/sepic/selector_2.cfm for the coilcraft on-line sepic inductor selector tool. 0.295 7,5 max 0.295 7,5 max max dot indicates pin 1 0.150 3,8 0.091 2,3 0.063 1,6 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 pattern 1 4 2 3
? coilcraft, inc. 2010 coupled inductors for sepic applications C msd7342 series specifications subject to change without notice. please check our website for latest information. document 621-2 document 621-2 revised 11/10/09 i rms (a) inductance 2 dcr max 3 srf typ 4 i sat (a) 5 both one part number 1 20% (h) (ohms) (mhz) 10% drop 20% drop 30% drop windings 6 winding 7 msd7342-252ml_ 2.5 0.033 55 6.0 6.2 6.3 2.17 3.06 msd7342-332ml_ 3.3 0.037 43 5.2 5.3 5.4 2.05 2.89 msd7342-472ml_ 4.7 0.051 35 4.1 4.3 4.6 1.74 2.46 msd7342-562ml_ 5.6 0.063 32 3.9 4.1 4.2 1.57 2.22 msd7342-682ml_ 6.8 0.070 30 3.7 3.8 3.9 1.49 2.10 msd7342-822ml_ 8.2 0.075 27 3.3 3.4 3.5 1.44 2.03 msd7342-103ml_ 10 0.100 22 2.8 2.9 3.0 1.24 1.76 msd7342-123ml_ 12 0.120 20 2.5 2.6 2.7 1.14 1.61 msd7342-153ml_ 15 0.130 18 2.2 2.3 2.4 1.09 1.54 msd7342-183ml_ 18 0.170 15 2.0 2.2 2.3 0.95 1.35 msd7342-223ml_ 22 0.220 13.5 1.9 2.0 2.1 0.84 1.19 msd7342-273ml_ 27 0.250 12.0 1.7 1.8 1.9 0.79 1.11 msd7342-333ml_ 33 0.270 11.0 1.5 1.6 1.7 0.76 1.07 msd7342-393ml_ 39 0.380 10.0 1.3 1.4 1.5 0.64 0.90 msd7342-473ml_ 47 0.420 9.5 1.2 1.3 1.4 0.61 0.86 msd7342-563ml_ 56 0.460 8.7 1.1 1.2 1.3 0.58 0.82 msd7342-683ml_ 68 0.600 7.3 1.0 1.1 1.2 0.51 0.72 msd7342-823ml_ 82 0.680 6.2 0.90 1.00 1.1 0.48 0.67 msd7342-104ml_ 100 0.770 5.5 0.80 0.92 0.98 0.45 0.63 msd7342-124ml_ 120 1.03 4.5 0.70 0.80 0.90 0.39 0.55 msd7342-154ml_ 150 1.35 4.0 0.65 0.76 0.80 0.34 0.48 msd7342-184ml_ 180 1.52 3.8 0.62 0.66 0.73 0.32 0.45 msd7342-224ml_ 220 1.72 3.5 0.59 0.62 0.66 0.30 0.42 msd7342-274ml_ 270 2.41 3.3 0.55 0.57 0.60 0.25 0.36 msd7342-334ml_ 330 2.70 3.0 0.49 0.52 0.54 0.24 0.34 msd7342-394ml_ 390 3.05 2.8 0.45 0.47 0.50 0.23 0.32 msd7342-474ml_ 470 4.00 2.6 0.41 0.43 0.46 0.20 0.28 msd7342-564ml_ 560 4.43 2.5 0.38 0.40 0.42 0.19 0.26 msd7342-684ml_ 680 5.00 2.3 0.36 0.37 0.38 0.18 0.25 msd7342-824ml_ 820 6.80 2.2 0.30 0.32 0.35 0.15 0.21 msd7342-105ml_ 1000 7.80 2.0 0.27 0.29 0.31 0.14 0.20 1. 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. 5. dc current, at which the inductance drops the specified amount from its value without current. it is the sum of the current flowing in both windings. 6. equal current when applied to each winding simultaneously that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 7. maximum current when applied to one winding that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 8. 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 129c w t = 129c w ( + ) dcr ii l1 2 l2 2 winding power loss = ( + ) dcr in watts (w) ii l1 2 l2 2 example 1. msd7342-123ml (equal current in each winding) winding power loss = (1.14 + 1.14 ) 0.120 = 0.312 w t = 0.312 w 129c w = 40c 22 example 2. ( = 1.4 a, winding p msd7342-123ml = 0.6 a) ii l1 l2 22 ower loss = (1.4 + 0.6 ) 0.120 = 0.278 w t = 0.278 w 129c w = 36c 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. 2010 coupled inductors for sepic applications C msd7342 series specifications subject to change without notice. please check our website for latest information. document 621-3 document 621-3 revised 11/10/09 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 -40 -20 0 20 40 60 80 100 140 120 ambient temperature (c) 120 110 100 90 80 70 60 50 40 30 20 10 0 25c percent of rated rms i irms derating
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