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Introduction
Specifications
Environmental
Performance curves
Schematics
Physical characteristics
Tape & Reel
Soldering/Washing

MSD1278T Series

High Temperature Shielded Coupled Power Inductors

Coilcraft's MSD1278T Series of 1:1 high-temperature coupled power inductors are used in Flyback, SEPIC, Ćuk, Zeta and other applications. The MSD_T family features magnetic shielding for compact packaging and tight winding-to-winding coupling.

Ideal for Flyback, SEPIC, Ćuk, Zeta and other applications
Magnetic shielding allows high-density mounting
Tight winding coupling
Industry standard footprint
AEC-Q200 Grade 1 (−40°C to +125°C)

See Selecting inductors for SEPIC

Need parts for space, military or other critical applications?
See Coilcraft AE612PND Series | See Coilcraft ML612PND Series | See Coilcraft MS612PND Series | See Coilcraft ST612PND Series

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Part number

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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.

Tolerance

M = 20%

Termination

L = Matte tin over nickel

Packaging

D = 13" machine-ready reel

. 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	Turns Ratio
Part number 1 (Hover for schematics)	Inductance (µH) 2	Tolerance (%)	DCR max (Ω) 3	Isolation Voltage (V)	Leakage Inductance (µH) 5	Turns Ratio
MSD1278T-472ML_	4.7	20	0.040	500	0.22	1 : 1
MSD1278T-562ML_	5.6	20	0.046	500	0.23	1 : 1
MSD1278T-682ML_	6.8	20	0.048	500	0.22	1 : 1
MSD1278T-822ML_	8.2	20	0.055	500	0.34	1 : 1
MSD1278T-103ML_	10	20	0.058	500	0.34	1 : 1
MSD1278T-123ML_	12	20	0.062	500	0.36	1 : 1
MSD1278T-153ML_	15	20	0.072	500	0.41	1 : 1
MSD1278T-183ML_	18	20	0.080	500	0.37	1 : 1
MSD1278T-223ML_	22	20	0.096	500	0.41	1 : 1
MSD1278T-273ML_	27	20	0.12	500	0.43	1 : 1
MSD1278T-333ML_	33	20	0.15	500	0.56	1 : 1
MSD1278T-393ML_	39	20	0.16	500	0.64	1 : 1
MSD1278T-473ML_	47	20	0.18	500	0.70	1 : 1
MSD1278T-563ML_	56	20	0.19	500	0.76	1 : 1
MSD1278T-683ML_	68	20	0.21	500	0.88	1 : 1
MSD1278T-823ML_	82	20	0.28	500	0.85	1 : 1
MSD1278T-104ML_	100	20	0.30	500	0.90	1 : 1
MSD1278T-124KL_	120	10	0.41	500	1.3	1 : 1
MSD1278T-154KL_	150	10	0.46	500	1.5	1 : 1
MSD1278T-184KL_	180	10	0.51	500	0.98	1 : 1
MSD1278T-224KL_	220	10	0.69	500	1.5	1 : 1
MSD1278T-274KL_	270	10	0.90	500	1.2	1 : 1
MSD1278T-334KL_	330	10	1.0	500	4.1	1 : 1
MSD1278T-394KL_	390	10	1.1	500	1.6	1 : 1
MSD1278T-474KL_	470	10	1.5	500	0.25	1 : 1
MSD1278T-564KL_	560	10	1.7	500	2.7	1 : 1
MSD1278T-684KL_	680	10	2.3	500	2.1	1 : 1
MSD1278T-824KL_	820	10	2.6	500	2.4	1 : 1
MSD1278T-105KL_	1000	10	2.9	500	4.3	1 : 1

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)
Part number 1 (Hover for schematics)	Inductance (µH) 2	Tolerance (%)	DCR max (Ω) 3	SRF typ (MHz) 4	Coupling coefficient	Leakage Inductance (µH) 5	10% drop	20% drop	30% drop	both windings 7	one winding 8
MSD1278T-472ML_	4.7	20	0.040	33.0	0.98	0.22	13.9	15.2	16.4	3.2	4.5
MSD1278T-562ML_	5.6	20	0.046	30.0	0.98	0.23	13.4	14.9	15.7	2.9	4.1
MSD1278T-682ML_	6.8	20	0.048	23.0	0.98	0.22	12.1	13.6	14.2	2.8	4.0
MSD1278T-822ML_	8.2	20	0.055	20.0	0.98	0.34	10.3	11.5	12.2	2.8	3.9
MSD1278T-103ML_	10	20	0.058	17.0	0.98	0.34	8.8	10.0	10.7	2.6	3.6
MSD1278T-123ML_	12	20	0.062	15.0	0.98	0.36	8.2	9.2	9.7	2.5	3.5
MSD1278T-153ML_	15	20	0.072	13.0	0.99	0.41	7.4	8.4	9.0	2.3	3.3
MSD1278T-183ML_	18	20	0.080	12.0	0.99	0.37	6.5	7.4	7.9	2.2	3.1
MSD1278T-223ML_	22	20	0.096	11.0	0.99	0.41	6.0	6.8	7.3	2.0	2.8
MSD1278T-273ML_	27	20	0.12	10.0	0.99	0.43	5.8	6.6	7.0	1.8	2.5
MSD1278T-333ML_	33	20	0.15	9.5	0.99	0.56	5.5	6.1	6.5	1.6	2.3
MSD1278T-393ML_	39	20	0.16	8.5	0.99	0.64	4.7	5.3	5.6	1.5	2.2
MSD1278T-473ML_	47	20	0.18	7.5	0.99	0.70	3.7	4.3	4.6	1.5	2.1
MSD1278T-563ML_	56	20	0.19	7.0	0.99	0.76	3.6	4.2	4.5	1.4	2.0
MSD1278T-683ML_	68	20	0.21	6.5	0.99	0.88	3.5	4.0	4.3	1.4	1.9
MSD1278T-823ML_	82	20	0.28	5.0	0.99	0.85	3.3	3.7	4.0	1.2	1.7
MSD1278T-104ML_	100	20	0.30	4.5	>0.99	0.90	2.8	3.2	3.5	1.1	1.6
MSD1278T-124KL_	120	10	0.41	4.3	0.99	1.3	2.6	2.9	3.2	0.96	1.4
MSD1278T-154KL_	150	10	0.46	4.1	>0.99	1.5	2.2	2.5	2.7	0.91	1.3
MSD1278T-184KL_	180	10	0.51	4.0	>0.99	0.98	2.1	2.4	2.6	0.86	1.2
MSD1278T-224KL_	220	10	0.69	3.4	>0.99	1.5	1.9	2.2	2.3	0.74	1.1
MSD1278T-274KL_	270	10	0.90	3.1	>0.99	1.2	1.7	1.9	2.1	0.65	0.92
MSD1278T-334KL_	330	10	1.0	2.9	0.99	4.1	1.5	1.7	1.8	0.61	0.86
MSD1278T-394KL_	390	10	1.1	2.7	>0.99	1.6	1.4	1.6	1.7	0.58	0.82
MSD1278T-474KL_	470	10	1.5	2.2	>0.99	0.25	1.3	1.5	1.6	0.50	0.70
MSD1278T-564KL_	560	10	1.7	2.0	>0.99	2.7	1.2	1.3	1.5	0.47	0.67
MSD1278T-684KL_	680	10	2.3	1.7	>0.99	2.1	1.0	1.1	1.2	0.41	0.58
MSD1278T-824KL_	820	10	2.6	1.4	>0.99	2.4	0.90	1.0	1.2	0.39	0.55
MSD1278T-105KL_	1000	10	2.9	1.3	>0.99	4.3	0.85	0.95	1.1	0.37	0.52

Notes

When ordering, please specify termination and packaging code: MSD1278T-105KLD.
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.
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.
SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value.
Leakage inductance is for L1 and is measured with L2 shorted
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.
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.
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:

L = 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).
B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.

Environmental

Environmental:

RoHS compliant

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

Inductance vs Current

Inductance vs Frequency

Schematics

Physical characteristics

Tape and Reel specification

Parts per reel	Reel dimensions (mm)					Tape dimensions (mm)						Orientation
13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
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.

MSD1278T Series

High Temperature Shielded Coupled Power Inductors