Document 621-1 Coupled Inductors MSD7342 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 flyback, multi-output buck and SEPIC. • They provide high inductance, high efficiency 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. + + D L1 C L2 VOUT C VIN – SW – Typical Flyback Converter D L2 + VOUT C AUX – 0.295 max 7,5 0.295 max 7,5 + Dot indicates pin 1 VIN 1 2 L1 L2 4 3 1 0.063 1,6 Dimensions are in D + L1 C 0.110 2,8 If board traces are run in these areas, consider masking them to prevent shorting. 3 4 C 0.130 3,3 VIN – VOUT – Typical SEPIC schematic + L2 C1 Q 1 L2 + 0.083 2,1 2 + C1 Q Recommended Land Pattern 0.091 2,3 2 – – 0.028 0,7 0.150 3,8 VOUT C Typical Buck Converter with auxiliary output VIN 0.181 max 4,6 4 D SW – 123 3 + L1 L1 C D Typical Zeta schematic C VOUT – 0.043 1,10 inches mm Specifications subject to change without notice. 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Document 621-1 Revised 11/09/15 Document 621-2 Coupled Inductors – MSD7342 Series Coupling Leakage Inductance2 DCR max3 SRF typ4 coefficient L typ5 Part number1 ±20% (µH) (Ohms) (MHz) typ (µH) MSD7342-252ML_ MSD7342-332ML_ MSD7342-472ML_ MSD7342-562ML_ MSD7342-682ML_ MSD7342-822ML_ MSD7342-103ML_ MSD7342-123ML_ MSD7342-153ML_ MSD7342-183ML_ MSD7342-223ML_ MSD7342-273ML_ MSD7342-333ML_ MSD7342-393ML_ MSD7342-473ML_ MSD7342-563ML_ MSD7342-683ML_ MSD7342-823ML_ MSD7342-104ML_ MSD7342-124ML_ MSD7342-154ML_ MSD7342-184ML_ MSD7342-224ML_ MSD7342-274ML_ MSD7342-334ML_ MSD7342-394ML_ MSD7342-474ML_ MSD7342-564ML_ MSD7342-684ML_ MSD7342-824ML_ MSD7342-105ML_ 2.5 3.3 4.7 5.6 6.8 8.2 10 12 15 18 22 27 33 39 47 56 68 82 100 120 150 180 220 270 330 390 470 560 680 820 1000 0.033 0.037 0.051 0.063 0.070 0.075 0.100 0.120 0.130 0.170 0.220 0.250 0.270 0.380 0.420 0.460 0.600 0.680 0.770 1.03 1.35 1.52 1.72 2.41 2.70 3.05 4.00 4.43 5.00 6.80 7.80 55 43 35 32 30 27 22 20 18 15 13.5 12.0 11.0 10.0 9.5 8.7 7.3 6.2 5.5 4.5 4.0 3.8 3.5 3.3 3.0 2.8 2.6 2.5 2.3 2.2 2.0 0.97 0.99 0.99 0.99 0.99 0.98 0.98 0.98 0.98 >0.99 >0.99 >0.99 >0.99 0.99 >0.99 >0.99 >0.99 0.99 >0.99 >0.99 >0.99 >0.99 >0.99 >0.99 >0.99 0.99 0.99 >0.99 0.99 >0.99 >0.99 1. When ordering, please specify termination and packaging codes: MSD7342-105MLC 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. 0.14 0.09 0.11 0.09 0.14 0.25 0.30 0.36 0.49 0.16 0.20 0.20 0.15 0.70 0.30 0.51 0.51 1.17 0.96 0.61 0.54 0.75 1.43 1.56 1.65 4.73 5.50 4.85 7.59 8.01 8.69 10% drop Isat (A)6 Irms (A) 20% 30% both one drop drop windings7 winding8 6.0 5.2 4.1 3.9 3.7 3.3 2.8 2.5 2.2 2.0 1.9 1.7 1.5 1.3 1.2 1.1 1.0 0.90 0.80 0.70 0.65 0.62 0.59 0.55 0.49 0.45 0.41 0.38 0.36 0.30 0.27 6.2 5.3 4.3 4.1 3.8 3.4 2.9 2.6 2.3 2.2 2.0 1.8 1.6 1.4 1.3 1.2 1.1 1.00 0.92 0.80 0.76 0.66 0.62 0.57 0.52 0.47 0.43 0.40 0.37 0.32 0.29 6.3 5.4 4.6 4.2 3.9 3.5 3.0 2.7 2.4 2.3 2.1 1.9 1.7 1.5 1.4 1.3 1.2 1.1 0.98 0.90 0.80 0.73 0.66 0.60 0.54 0.50 0.46 0.42 0.38 0.35 0.31 2.17 2.05 1.74 1.57 1.49 1.44 1.24 1.14 1.09 0.95 0.84 0.79 0.76 0.64 0.61 0.58 0.51 0.48 0.45 0.39 0.34 0.32 0.30 0.25 0.24 0.23 0.20 0.19 0.18 0.15 0.14 3.06 2.89 2.46 2.22 2.10 2.03 1.76 1.61 1.54 1.35 1.19 1.11 1.07 0.90 0.86 0.82 0.72 0.67 0.63 0.55 0.48 0.45 0.42 0.36 0.34 0.32 0.28 0.26 0.25 0.21 0.20 5. Leakage inductance is for L1 and is measured with L2 shorted. 6. 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. 7. Equal current when applied to each winding simultaneously that causes a 40°C temperature rise from 25°C ambient. This information is for reference 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 40°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings. To predict temperature rise go to online calculator. 9. Electrical specifications at 25°C. 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 Irms current to predict temperature rise and overall losses, including core loss. Go to online calculator Specifications subject to change without notice. Please check our website for latest information. Document 621-2 Document 621-2 Revised 11/09/15 Revised 02/23/11 Document 621-3 Coupled Inductors – MSD7342 Series Typical L vs Current Typical L vs Frequency 10000 10000 1000 µH 100 µH 100 47 µH 10 µH 10 1000 µH 1000 470 µH Inductance (µH) Inductance (µH) 1000 470 µH 100 µH 100 47 µH 10 µH 10 4.7 µH 4.7 µH 1 0.01 1 0.1 10 1 0.1 Current (A) 1 10 100 Frequency (MHz) 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 – 0.87g Ambient temperature –40°C to +85°C with (40°C rise) Irms current. Maximum part temperature +125°C (ambient + temp rise). Storage temperature Component: –40°C to +125°C. Tape and reel packaging: –40°C to +80°C Winding to winding isolation 200 Vrms 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 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 Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. See Doc787_PCB_Washing.pdf. Specifications subject to change without notice. Please check our website for latest information. Document 621-3 Document 621-3 Revised 11/09/15 Revised 02/23/11