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XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors

MSD1278H Series

High Temperature Shielded Coupled Power Inductors

RoHS compliant halogen free AEC-Q flag

Coilcraft's MSD1278H Series of high-temperature 1:1 coupled power inductors feature magnetic shielding for compact packaging and tight winding-to-winding coupling. They are ideal for Flyback, SEPIC, Ćuk, Zeta and other applications.

  • Tight coupling (k ≥ 0.98)
  • 500 Vrms, one minute isolation (hipot) between primary and secondary
  • Ideal for Flyback, SEPIC, Ćuk, Zeta and other applications
  • High efficiency and excellent current handling
  • Can also be used as two single inductors connected in series or parallel, as a common mode choke or as a 1 : 1 transformer.
  • AEC-Q200 Grade 1 (−40°C to +125°C)

See Selecting inductors for SEPIC

Buy Now:
Count Unit price
1 $2.88
250 $1.90
500 $1.14
1000 $0.89
2500 $0.76
5000 $0.70

For high volume or non-stock items, request a quote.

. in stock, ready to ship today.
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Specifications

Electrical specifications at 25°C.

For Flyback Applications

Part number 1
(Hover for schematics)
Inductance (µH) 2 Tolerance (%) DCR max (Ω) 3 Isolation
Voltage (V)
Leakage
Inductance (µH) 5
MSD1278H-472MED 4.70 20 0.022 500 0.35
MSD1278H-652MED 6.50 20 0.025 500 0.38
MSD1278H-822MED 8.20 20 0.030 500 0.41
MSD1278H-103MED 10.00 20 0.036 500 0.46
MSD1278H-123MED 12.00 20 0.037 500 0.53
MSD1278H-153MED 15.00 20 0.048 500 0.55
MSD1278H-183MED 18.00 20 0.051 500 0.64
MSD1278H-223MED 22.00 20 0.068 500 0.72
MSD1278H-273MED 27.00 20 0.078 500 0.80
MSD1278H-333MED 33.00 20 0.086 500 0.85
MSD1278H-393MED 39.00 20 0.11 500 1.00
MSD1278H-473MED 47.00 20 0.13 500 1.10
MSD1278H-563MED 56.00 20 0.14 500 1.30
MSD1278H-683MED 68.00 20 0.16 500 1.40
MSD1278H-823MED 82.00 20 0.21 500 1.60
MSD1278H-104KED 100.00 10 0.23 500 1.80
MSD1278H-124KED 120.00 10 0.31 500 2.00
MSD1278H-154KED 150.00 10 0.36 500 2.20
MSD1278H-184KED 180.00 10 0.47 500 2.50
MSD1278H-224KED 220.00 10 0.54 500 2.80
MSD1278H-274KED 270.00 10 0.74 500 3.10
MSD1278H-334KED 330.00 10 0.82 500 3.40
MSD1278H-394KED 390.00 10 0.91 500 3.60
MSD1278H-474KED 470.00 10 1.2 500 4.20
MSD1278H-564KED 560.00 10 1.4 500 4.60
MSD1278H-684KED 680.00 10 1.8 500 5.00
MSD1278H-824KED 820.00 10 2.0 500 5.50
MSD1278H-105KED 1000.00 10 2.4 500 5.80

For SEPIC Applications

Part number 1
(Hover for schematics)
Inductance (µH) 2 Tolerance (%) DCR max (Ω) 3 SRF typ (MHz) 4 Coupling coefficient Leakage
Inductance (µH) 5
Isat (A) 6 Irms (A)
10% drop 20% drop 30% drop both windings 7 one winding 8
MSD1278H-472MED 4.7 20 0.022 30.0 0.98 0.35 10.2 11.6 12.7 5.11 7.14
MSD1278H-652MED 6.5 20 0.025 26.0 0.98 0.38 9.2 10.4 11.5 4.80 6.74
MSD1278H-822MED 8.2 20 0.030 23.0 0.98 0.41 8.3 9.3 10.2 4.32 6.15
MSD1278H-103MED 10 20 0.036 20.0 0.98 0.46 7.1 8.0 8.8 4.01 5.56
MSD1278H-123MED 12 20 0.037 18.0 0.98 0.53 6.6 7.5 8.3 3.87 5.47
MSD1278H-153MED 15 20 0.048 16.0 0.99 0.55 6.0 6.8 7.5 3.42 4.77
MSD1278H-183MED 18 20 0.051 14.0 0.99 0.64 5.5 6.3 6.8 3.28 4.67
MSD1278H-223MED 22 20 0.068 12.0 0.99 0.72 5.1 5.6 6.2 2.88 4.06
MSD1278H-273MED 27 20 0.078 11.0 0.99 0.80 4.6 5.1 5.6 2.70 3.91
MSD1278H-333MED 33 20 0.086 10.0 0.99 0.85 4.2 4.6 5.1 2.54 3.66
MSD1278H-393MED 39 20 0.11 8.7 0.99 1.0 3.8 4.3 4.7 2.22 3.12
MSD1278H-473MED 47 20 0.13 8.1 0.99 1.1 3.6 3.9 4.4 1.47 2.94
MSD1278H-563MED 56 20 0.14 7.5 0.99 1.3 3.3 3.6 4.0 1.98 2.75
MSD1278H-683MED 68 20 0.16 7.0 0.99 1.4 3.0 3.2 3.6 1.91 2.65
MSD1278H-823MED 82 20 0.21 6.3 0.99 1.6 2.7 2.9 3.3 1.63 2.34
MSD1278H-104KED 100 10 0.23 5.5 >0.99 1.8 2.4 2.6 3.0 1.53 2.25
MSD1278H-124KED 120 10 0.31 4.8 0.99 2.0 2.2 2.4 2.7 1.33 1.87
MSD1278H-154KED 150 10 0.36 4.4 >0.99 2.2 2.0 2.2 2.4 1.26 1.79
MSD1278H-184KED 180 10 0.47 4.2 >0.99 2.5 1.8 2.0 2.2 1.07 1.54
MSD1278H-224KED 220 10 0.54 3.8 >0.99 2.8 1.6 1.8 2.0 1.00 1.41
MSD1278H-274KED 270 10 0.74 3.2 >0.99 3.1 1.5 1.6 1.8 0.87 1.25
MSD1278H-334KED 330 10 0.82 2.8 0.99 3.4 1.3 1.4 1.6 0.83 1.16
MSD1278H-394KED 390 10 0.91 2.7 >0.99 3.6 1.2 1.3 1.5 0.79 1.12
MSD1278H-474KED 470 10 1.2 2.3 >0.99 4.2 1.1 1.2 1.4 0.68 0.95
MSD1278H-564KED 560 10 1.4 2.2 >0.99 4.6 1.0 1.1 1.3 0.64 0.90
MSD1278H-684KED 680 10 1.8 1.8 >0.99 5.0 0.90 1.0 1.1 0.61 0.79
MSD1278H-824KED 820 10 2.0 1.7 >0.99 5.5 0.82 0.92 1.0 0.51 0.74
MSD1278H-105KED 1000 10 2.4 1.6 >0.99 5.8 0.75 0.83 0.92 0.49 0.69
Notes
  1. When ordering, please specify termination code: MSD1278H-105KED. 
  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. 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.
  7. Irms, both windings: Equal current when applied to each winding simultaneously that causes a 40°C temperature rise from 25°C ambient. Determine temperature rise.
  8. Irms, one winding: Maximum current when applied to one winding that causes a 40°C temperature rise from 25°C ambient. Determine temperature rise.

Termination:

  • E = RoHS compliant matte tin over nickel over phos bronze.
  • T = RoHS tin-silver-copper (95.5/4/0.5). (Special order, added cost)
  • S = non-RoHS tin-lead (63/37). (Special order, added cost)

Packaging:

  • 13" reel, machine-ready 
    EIA-481 embossed plastic tape (500 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
Environmental
Environmental:
RoHS compliant , halogen free
Ambient temperature range:
–40°C to +125°C with Irms current
Storage temperature range:
Component: –40°C to +165°C.
Tape and reel packaging: –40°C to +80°C
Maximum part temperature:
+165°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):

Performance curves

Schematics

msd1278tschem.GIFmsd1260s.gif

Physical characteristics

msd1278hd.gif
 

dims_inches_mm.gif

Tape and Reel specification

tapereel_pl-(28).gif

 
Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_ak.gif
500 330 100 13 30,4 24,4 24 16 4 2 8,7 0,5

General specification

Core Material:
Ferrite
Weight:
3.7 – 4.4 g
Packaging:
500/13″ reel; Plastic tape: 24 mm wide, 0.5 mm thick, 16 mm pocket spacing, 8.7 mm pocket depth
Winding to Winding Isolation:
500 Vrms, one minute

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
PCB washing Tested with pure water or alcohol only. More info.

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