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Coupled SEPIC Inductors
MSC1278 Series

  • Loosely coupled inductors, designed for SEPIC applications
  • See Selecting inductors for SEPIC and SEPIC Inductor Selector tool
  • Saturation current rating up to 10.66 Amps!
  • Low DC resistance provides high efficiency
  • 500 Vrms winding-to-winding isolation
  • RoHS-compliant. 260°C compatible. Matte tin over nickel over phos bronze terminations
  • COTS Plus tin-silver-copper and tin-lead terminations available

SPECIFICATIONS


Part number1
Click to get parts
L2
(µH)
DCR
max3
(Ohms)
SRF
typ4
(MHz)
Coupling
coefficient
typ
Leakage
L typ5
(µH)
Isat (A)6 Irms (A)
10%
drop
20%
drop
30%
drop
both
windings7
one
winding8
MSC1278-103ML_ 10 ±20%   0.058 20 0.80 2.75 8.80 10.0 10.66 2.56 3.62
MSC1278-223KL_ 22 ±10% 0.096 12 0.82 5.85 6.00 6.80 7.26 1.99 2.81
MSC1278-333KL_ 33 ±10% 0.15 9.5 0.85 10.1 5.50 6.10 6.52 1.59 2.25
MSC1278-473KL_ 47 ±10% 0.18 7.8 0.83 14.5 3.70 4.34 4.60 1.45 2.05
1 When ordering, please specify termination and packaging codes: e.g. MSC1278-105KLD
  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. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value. Details
5 Leakage Inductance is for L1 and is measured with L2 shorted.
6 Isat: 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. Details
7 Irms, both windings: 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. Determine temperature rise.
8 Irms, one winding: 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.
Determine temperature rise.
9 Ambient temperature range: −40°C to +85°C with Irms current.
10 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
11 Maximum part temperature: +125°C (Ambient + temperature rise)
12 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.
13 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: October 30, 2017