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

3D Model Datasheet

MSD1278 Series

Common Mode Chokes

Our MSD1278 Series common mode chokes provide both common-mode and differential-mode filtering in a single device. They are ideal for use in both power line and signal line applications, providing 500 Vrms, one minute winding-to-winding isolation.

Common mode and differential mode filtering in a single device
Ideal for use in both power line and signal line applications
Up to 110 MHz differential mode cutoff frequency
500 Vrms, one minute winding-to-winding isolation

Refer to Designing Common Mode Filters for design guidance.

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Count	Unit price
1	$2.74
250	$1.78
500	$1.08
1000	$0.84
2500	$0.72
5000	$0.65

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

Termination

L = Matte tin over nickel

Packaging

D = 13" machine-ready reel

Tolerance

M = 20%

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Specifications

Electrical specifications at 25°C.

Part number 1	Lines	Common mode peak impedance (kΩ)	Cutoff frequency (MHz) 2	Inductance min (µH) 3	Irms (A) 4	DCR max (Ω) 5	Isolation Voltage (Vrms) 6
Part number 1	Lines	Common mode peak impedance (kΩ)	Cutoff frequency (MHz) 2	Inductance min (µH) 3	Irms (A) 4	DCR max (Ω) 5	Isolation Voltage (Vrms) 6
MSD1278-472ML_	2	7.74 @ 32.0 MHz	110	3.8	3.16	0.038	500
MSD1278-562ML_	2	7.70 @ 25.0 MHz	81.0	4.5	2.87	0.046	500
MSD1278-682ML_	2	9.71 @ 22.0 MHz	63.0	5.4	2.81	0.048	500
MSD1278-822ML_	2	10.77 @ 21.0 MHz	87.0	6.6	2.76	0.050	500
MSD1278-103ML_	2	11.29 @ 19.0 MHz	58.0	8.0	2.56	0.058	500
MSD1278-123ML_	2	13.41 @ 17.0 MHz	57.0	9.6	2.48	0.062	500
MSD1278-153ML_	2	17.44 @ 16.0 MHz	53.0	12	2.30	0.072	500
MSD1278-183ML_	2	16.96 @ 15.0 MHz	43.0	14	2.18	0.080	500
MSD1278-223ML_	2	19.54 @ 12.0 MHz	35.0	18	1.99	0.096	500
MSD1278-273ML_	2	22.40 @ 11.0 MHz	39.0	22	1.78	0.120	500
MSD1278-333ML_	2	39.00 @ 9.8 MHz	37.0	26	1.59	0.150	500
MSD1278-393ML_	2	47.17 @ 9.0 MHz	42.0	31	1.54	0.160	500
MSD1278-473ML_	2	48.28 @ 8.6 MHz	28.0	38	1.45	0.180	500
MSD1278-563ML_	2	55.35 @ 7.7 MHz	26.0	45	1.41	0.190	500
MSD1278-683ML_	2	63.59 @ 6.8 MHz	22.0	54	1.35	0.210	500
MSD1278-823ML_	2	76.76 @ 6.1 MHz	22.0	66	1.16	0.280	500
MSD1278-104ML_	2	79.30 @ 5.8 MHz	22.0	80	1.13	0.300	500
MSD1278-124KL_	2	95.79 @ 4.9 MHz	18.0	108	0.96	0.410	500
MSD1278-154KL_	2	80.01 @ 4.3 MHz	23.0	135	0.91	0.460	500
MSD1278-184KL_	2	82.56 @ 3.9 MHz	13.0	162	0.86	0.510	500
MSD1278-224KL_	2	114.90 @ 3.7 MHz	13.0	198	0.74	0.690	500
MSD1278-274KL_	2	140.00 @ 2.9 MHz	12.0	243	0.65	0.900	500
MSD1278-334KL_	2	101.70 @ 2.8 MHz	9.4	297	0.61	1.020	500
MSD1278-394KL_	2	87.12 @ 2.6 MHz	9.4	351	0.58	1.120	500
MSD1278-474KL_	2	159.60 @ 2.3 MHz	11.0	423	0.50	1.430	500
MSD1278-564KL_	2	142.60 @ 2.2 MHz	8.7	504	0.47	1.690	500
MSD1278-684KL_	2	165.00 @ 1.9 MHz	7.4	612	0.41	2.290	500
MSD1278-824KL_	2	138.00 @ 1.8 MHz	6.9	738	0.39	2.550	500
MSD1278-105KL_	2	154.00 @ 1.7 MHz	6.0	900	0.37	2.830	500

Notes

When ordering, please specify termination and packaging codes: e.g. MSD1278-105KLC
Frequency at which the differential mode attenuation equals 3 dB
Inductance shown for each winding, measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent.
Irms: Current that causes a 40°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.
DCR is for each winding, measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
Interwinding isolation (hipot) tested for one minute.

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 +85°C with Irms current

Storage temperature range:

Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C

Maximum part temperature:

+125°C (ambient + temp rise)

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Performance curves

Attenuation (Ref: 50 Ohms)

Impedance 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

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:

Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info

MSD1278 Series

Common Mode Chokes