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Coupled Power Inductors
for SEPIC – MSD1278 Series

  • Ideal for use as coupled inductors in SEPIC applications
    See application note, Doc 639 Selecting Coupled Inductors for SEPIC Applications
  • Excellent coupling coefficient: K > 0.94
  • Can be used connected in series or parallel, or as a transformer DETAILS
  • Saturation current rating up to 14.9 Amps! Low DC resistance provides high efficiency
  • 500 V isolation, winding-to-winding and winding-to-core
  • RoHS-compliant. 260°C compatible. Matte tin over nickel over phos bronze terminations
  • COTS Plus tin-silver-copper and tin-lead terminations available
  • Samples of all values are available in Coilcraft Designer's Kit C400

Photo    Pricing    Materials declaration    PDF data sheet

SPECIFICATIONS

L vs Frequency    L vs Current      Current  Derating     Core loss

Schematic    Qualification standards    Dimensions   

Tape and reel specifications    
MSD1278-472ML_ 4.7 ±20% 0.038 32.0 14.9 3.16 4.47
MSD1278-562ML_ 5.6 ±20% 0.046 25.0 13.4 2.87 4.06
MSD1278-682ML_ 6.8 ±20% 0.048 24.0 13.1 2.81 3.98
MSD1278-822ML_ 8.2 ±20% 0.050 18.0 10.8 2.76 3.9
MSD1278-103ML_ 10 ±20% 0.058 16.5 10.5 2.56 3.62
MSD1278-123ML_ 12 ±20% 0.062 14.5 9.6 2.48 3.50
MSD1278-153ML_ 15 ±20% 0.072 11.8 9.1 2.30 3.25
MSD1278-183ML_ 18 ±20% 0.080 10.5 8.0 2.18 3.08
MSD1278-223ML_ 22 ±20% 0.096 9.0 6.8 1.99 2.81
MSD1278-273ML_ 27 ±20% 0.120 8.4 6.5 1.78 2.52
MSD1278-333ML_ 33 ±20% 0.150 7.6 5.6 1.59 2.25
MSD1278-393ML_ 39 ±20% 0.160 6.5 5.5 1.54 2.18
MSD1278-473ML_ 47 ±20% 0.180 6.0 5.2 1.45 2.05
MSD1278-563ML_ 56 ±20% 0.190 5.6 4.5 1.41 2.00
MSD1278-683ML_ 68 ±20% 0.210 5.0 4.1 1.35 1.90
MSD1278-823ML_ 82 ±20% 0.280 4.1 3.8 1.16 1.65
MSD1278-104ML_ 100 ±20% 0.300 3.6 3.4 1.13 1.59
MSD1278-124KL_ 120 ±10% 0.410 3.2 3.2 0.96 1.36
MSD1278-154KL_ 150 ±10% 0.460 3.0 2.8 0.91 1.29
MSD1278-184KL_ 180 ±10% 0.510 2.7 2.5 0.86 1.22
MSD1278-224KL_ 220 ±10% 0.690 2.5 2.3 0.74 1.05
MSD1278-274KL_ 270 ±10% 0.900 2.1 2.1 0.65 0.92
MSD1278-334KL_ 330 ±10% 1.02 2.0 1.9 0.61 0.86
MSD1278-394KL_ 390 ±10% 1.12 1.8 1.7 0.58 0.82
MSD1278-474KL_ 470 ±10% 1.43 1.6 1.6 0.50 0.70
MSD1278-564KL_ 560 ±10% 1.69 1.5 1.5 0.47 0.67
MSD1278-684KL_ 680 ±10% 2.29 1.4 1.3 0.41 0.58
MSD1278-824KL_ 820 ±10% 2.55 1.3 1.2 0.39 0.55
MSD1278-105KL_ 1000 ±10% 2.83 1.1 1.1 0.37 0.52
1 When ordering, please specify termination and packaging codes: e.g. MSD1278-105KLD
  Termination: L = RoHS compliant matte tin over nickel over phos bronze
Special order, added cost: T = RoHS tin-silver-copper (95.5/4/0.5) or
S = non-RoHS tin-lead (63/37).
Packaging: D = 13" reel, machine-ready 
EIA-481 embossed plastic tape (500 parts per full reel).
B = Less than full reel
In tape, 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. Details
5 Isat: DC current, at which the inductance drops 30% (typ) from its value without current. It is the current flowing in one winding or the sum of the current flowing in both windings. Details
6 Irms, both windings: Equal current, when applied to each winding simultaneously, that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. See temperature rise calculation.
7 Irms, one winding: Maximum current, when applied to one winding, that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. See temperature rise calculation.
8 Ambient temperature range: –40°C to +85°C with Irms current.
+85°C to +125°C with derated current Derating curve
9 Storage temperature range: Component: –40°C to +125°C
Packaging: –55°C to +80°C
10 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
11 Electrical specifications at 25°C.
See Qualification Standards for complete environmental and test data.
Refer to Soldering Coilcraft Components before soldering.
 
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Updated: May 13, 2008