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Coupled Power Inductors
MSD1278 Series

Shielded coupled inductors for Flyback, SEPIC and other applications
See Selecting inductors for SEPIC and SEPIC Inductor Selector tool
Also suitable for use as common mode chokes
Excellent coupling coefficient: K > 0.98
Saturation current rating up to 14.9 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
Samples of all values are available in Coilcraft Designer's Kit C400

Photo Pricing Materials declaration PDF data sheet

SPECIFICATIONS

L vs Frequency L vs Current Current Derating Core loss

Schematics Dimensions Tape and reel specifications 3D model


MSD1278-472ML_	4.7 ±20%	0.038	32.0	0.98	0.22	14.9	3.16	4.47
MSD1278-562ML_	5.6 ±20%	0.046	25.0	0.98	0.23	13.4	2.87	4.06
MSD1278-682ML_	6.8 ±20%	0.048	24.0	0.98	0.22	13.1	2.81	3.98
MSD1278-822ML_	8.2 ±20%	0.050	18.0	0.98	0.34	10.8	2.76	3.9
MSD1278-103ML_	10 ±20%	0.058	16.5	0.98	0.34	10.5	2.56	3.62
MSD1278-123ML_	12 ±20%	0.062	14.5	0.98	0.36	9.6	2.48	3.50
MSD1278-153ML_	15 ±20%	0.072	11.8	0.99	0.41	9.1	2.30	3.25
MSD1278-183ML_	18 ±20%	0.080	10.5	0.99	0.37	8.0	2.18	3.08
MSD1278-223ML_	22 ±20%	0.096	9.0	0.99	0.41	6.8	1.99	2.81
MSD1278-273ML_	27 ±20%	0.120	8.4	0.99	0.43	6.5	1.78	2.52
MSD1278-333ML_	33 ±20%	0.150	7.6	0.99	0.56	5.6	1.59	2.25
MSD1278-393ML_	39 ±20%	0.160	6.5	0.99	0.64	5.5	1.54	2.18
MSD1278-473ML_	47 ±20%	0.180	6.0	0.99	0.70	5.2	1.45	2.05
MSD1278-563ML_	56 ±20%	0.190	5.6	0.99	0.76	4.5	1.41	2.00
MSD1278-683ML_	68 ±20%	0.210	5.0	0.99	0.88	4.1	1.35	1.90
MSD1278-823ML_	82 ±20%	0.280	4.1	0.99	0.85	3.8	1.16	1.65
MSD1278-104ML_	100 ±20%	0.300	3.6	>0.99	0.90	3.4	1.13	1.59
MSD1278-124KL_	120 ±10%	0.410	3.2	0.99	1.31	3.2	0.96	1.36
MSD1278-154KL_	150 ±10%	0.460	3.0	>0.99	1.46	2.8	0.91	1.29
MSD1278-184KL_	180 ±10%	0.510	2.7	>0.99	0.98	2.5	0.86	1.22
MSD1278-224KL_	220 ±10%	0.690	2.5	>0.99	1.54	2.3	0.74	1.05
MSD1278-274KL_	270 ±10%	0.900	2.1	>0.99	1.17	2.1	0.65	0.92
MSD1278-334KL_	330 ±10%	1.02	2.0	0.99	4.14	1.9	0.61	0.86
MSD1278-394KL_	390 ±10%	1.12	1.8	>0.99	1.64	1.7	0.58	0.82
MSD1278-474KL_	470 ±10%	1.43	1.6	>0.99	0.25	1.6	0.50	0.70
MSD1278-564KL_	560 ±10%	1.69	1.5	>0.99	2.68	1.5	0.47	0.67
MSD1278-684KL_	680 ±10%	2.29	1.4	>0.99	2.11	1.3	0.41	0.58
MSD1278-824KL_	820 ±10%	2.55	1.3	>0.99	2.39	1.2	0.39	0.55
MSD1278-105KL_	1000 ±10%	2.83	1.1	>0.99	4.28	1.1	0.37	0.52

1	When ordering, please specify termination and packaging codes: e.g. MSD1278-105KLD
	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.
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 30% (typ) 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. See temperature rise calculation. See temperature rise calculation.
8	Irms, one winding: Maximum current when applied to one winding that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. See temperature rise calculation.
9	Ambient temperature range:	–40°C to +85°C with Irms current. +85°C to +125°C with derated current Derating curve
10	Storage temperature range:	Component: –40°C to +125°C T&R packaging: –40°C to +80°C
11	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.
12	Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.

Coupled Power Inductors MSD1278 Series

SPECIFICATIONS