MSD1278H Series

High Temperature Shielded Coupled Power Inductors

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

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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.

Termination

E = Matte tin over nickel over phos bronze

Packaging

D = 13" machine-ready reel

Tolerance

M = 20%

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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 (%)	DCR max (Ω) 3	Isolation Voltage (V)	Leakage Inductance (µH) 5
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)
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
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	2.10	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

When ordering, please specify termination code: MSD1278H-105KED.
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:

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