MSD7342-252ML COILCRAFT | Alldatasheet

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Technical content

© 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 – 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 –40°C to +85°C with Irms current, +85°C to +125°C with derated current Storage temperature Component: –40°C to +125°C. 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 Only pure water or alcohol recommended For SEPIC

Applications

Refer to Application Note, Document 639, “Selecting Coupled Inductors for SEPIC Applications” 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 2 L1 L2 Recommended Land Pattern

© Coilcraft, Inc. 2010 Coupled Inductors for SEPIC Applications – 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 Irms (A) Inductance2 DCR max3 SRF typ4 Isat (A)5 both one Part number1 ±20% (µH) (Ohms) (MHz) 10% drop 20% drop 30% drop windings6 winding7 1. 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 =1 3″ 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 40°C temperature rise from 25°C ambient. See temperature rise calculation. 7. Maximum current when applied to one winding that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. 8. 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. Temperature rise calculation based on specified Irms Temperature rise ( t) = Winding power loss × 129°C WΔ Δt = × 129°C W( + ) × DCRIIL1 Winding power loss = ( + ) × DCR in Watts (W)IIL1 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 × 129°C W = 40°C Δ Example 2. ( = 1.4 A, Winding p MSD7342-123ML = 0.6 A)IIL1 L2 22ower loss = (1.4 +0.6 ) × 0.120 = 0.278 W t = 0.278 W × 129°C W = 36°CΔ 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. Visit www.coilcraft.com/coupledloss.

© Coilcraft, Inc. 2010 Coupled Inductors for SEPIC Applications – 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 100 1000 10000 0.01 0.1 101 Current (A) Inductance (µH) 4.7 µH 10 µH 47 µH 100 µH 470 µH 1000 µH 100 1000 10000 0.1 1 10010 Frequency (MHz) Inductance (µH) 4.7 µH 10 µH 47 µH 100 µH 470 µH 1000 µH -40 -20 0 20 40 60 80 100 140 120 Ambient temperature (°C) 120 110 100 25°C Percent of rated rms I Irms Derating