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Coilcraft CPS
Close up of MSD1278H-274KED
3D Model Datasheet

MSD1278H-274

MSD1278H-274KED

RoHS compliant halogen free AEC-Q flag

For more information and specification about the part.

Go to series
Buy Now:
Count Unit price
1 $3.06
250 $2.02
500 $1.21
1000 $0.95
2500 $0.81
5000 $0.75

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

. in stock, ready to ship today.
Request a Sample:
Designer's Kit:
Kit Values Price
C512 28 (3 of each) $85.00

Specifications

Electrical specifications at 25°C.

For Flyback Applications

Part number 1
(Hover for schematics)
Inductance (µH) 2
(Tolerance: ±10%) 		DCR max (Ω) 3 Isolation
Voltage (V) 		Leakage
Inductance (µH) 5
MSD1278H-274KED 270.00 0.74 500 3.10

For SEPIC Applications

Part number 1
(Hover for schematics)
Inductance (µH) 2
(Tolerance: ±10%) 		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-274KED 270 0.74 3.2 >0.99 3.1 1.5 1.6 1.8 0.87 1.25
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:

  • D = 13″ machine-ready reel. 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):
See FIT/MTBF Calculations

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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