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© Coilcraft Inc. 2013

This product may not be used in medical or high

risk applications without prior Coilcraft approval.

Specification subject to change without notice.

Please check web site for latest information.

1. Please specify

termination and packaging codes:

MSS1278-105KLD

Termination:L =RoHS compliant matte tin over

nickel over phos bronze.

Special order:

T = RoHS tin-silver-copper

(95.5/4/0.5) or

S = non-RoHS

tin-lead (63/37).

Packaging: D=13

″ machine-ready reel. EIA-

481 embossed plastic tape

(500 parts per full reel).

B=Less than full reel. In tape, but

not machine ready. To have a

leader and trailer added ($25

charge), use code letter D

instead.

2. Inductance tested at 100 kHz, 0.1 Vrms, 0 Adc us-

ing an Agilent/HP 4263B LCR meter or equivalent.

3. DCR measured on a micro-ohmmeter and a

Coilcraft CCF858 test fixture.

4. SRF measured using an Agilent/HP 4191A or

equivalent.

5. DC current at which the inductance drops the

specified amount from its value without current.

6. Current that causes the specified temperature rise

from 25°C ambient.

7. Electrical specifications at 25°C.

Refer to Doc 362 “Soldering Surface Mount

Components” before soldering.

Document 322-1

Document 322-1 Revised 04/04/13

SMT Power Inductors – MSS1278

SRF

(mOhms)

10% 20% 30% 20°C 40°C

(µH)

typ

max

(MHz) drop drop drop rise rise

MSS1278-142ML_

1.4 ±20%

8.8

9.8

80.0

25.2 28.6 30.6

7.00 10.00

MSS1278-472ML_

4.7 ±20%

13.9

15.5

30.0

13.7 15.2 15.9

4.30 6.20

MSS1278-562ML_

5.6 ±20%

15.7

17.5

24.0

12.2 13.7 14.6

4.30 6.20

MSS1278-682ML_

6.8 ±20%

19.1

21.3

21.0

11.3 12.7 13.7

4.20 6.00

MSS1278-822ML_

8.2 ±20%

20.3

22.6

20.0

10.1 11.5 12.3

4.10 5.90

MSS1278-103ML_

10 ±20%

21.8

24.3

17.0

9.36 10.6 11.2

4.00 5.70

MSS1278-123ML_

12 ±20%

23.2

25.8

15.0

8.84 10.0 10.7

3.70 5.20

MSS1278-153ML_

15 ±20%

27.9

31.0

13.0

7.30 8.36 9.00 3.50 4.90

MSS1278-183ML_

18 ±20%

30.8

34.3

12.0

6.10 7.10 7.74 3.00 4.50

MSS1278-223ML_

22 ±20%

35.5

39.5

11.0

6.04 6.78 7.24 2.90 4.00

MSS1278-273ML_

27 ±20%

45.0

50.0

10.0

5.80 6.56 7.02 2.60 3.60

MSS1278-333ML_

33 ±20%

61.9

68.8

9.5

5.22 5.90 6.30 2.30 3.10

MSS1278-393ML_

39 ±20%

69.1

76.8

8.5

4.68 5.42 5.80 2.10 3.00

MSS1278-473ML_

47 ±20%

72.3

80.4

7.5

4.40 5.02 5.32 2.00 2.90

MSS1278-563ML_

56 ±20%

80.2

89.2

7.0

4.02 4.60 4.90 1.90 2.70

MSS1278-683ML_

68 ±20%

91.3 101.5

6.5

3.40 3.86 4.26 1.80 2.60

MSS1278-823ML_

82 ±20%

125.9 139.9

5.0

3.12 3.58 3.80 1.60 2.30

MSS1278-104ML_ 100 ±20%

135.1 150.2

4.5

2.88 3.28 3.52 1.50 2.20

MSS1278-124KL_

120 ±10%

182.3 202.6

4.3

2.62 3.00 3.24 1.40 1.90

MSS1278-154KL_

150 ±10%

216.5 240.6

4.1

2.48 2.86 3.02 1.30 1.80

MSS1278-184KL_

180 ±10%

229.0 254.5

4.0

2.26 2.58 2.74 1.20 1.70

MSS1278-224KL_

220 ±10%

323.6 359.6

3.4

1.96 2.22 2.36 1.00 1.60

MSS1278-274KL_

270 ±10%

415.6 461.8

3.1

1.74 2.04 2.18 0.90 1.20

MSS1278-334KL_

330 ±10%

487.3 541.5

2.9

1.66 1.86 2.00 0.80 1.00

MSS1278-394KL_

390 ±10%

533.6 592.9

2.7

1.52 1.72 1.88 0.75 1.00

MSS1278-474KL_

470 ±10%

707.5 786.2

2.2

1.34 1.54 1.64 0.66 0.90

MSS1278-564KL_

560 ±10%

777.4 863.8

2.0

1.24 1.42 1.50 0.60 0.80

MSS1278-684KL_

680 ±10%

1045

1162

1.7

1.16 1.28 1.38 0.55 0.75

MSS1278-824KL_

820 ±10%

1166

1296

1.4

1.04 1.16 1.26 0.50 0.70

MSS1278-105KL_ 1000 ±10% 1334

1483

1.3

0.97 1.10 1.14 0.48 0.68

Designer’s Kit C380 contains 3 each of all values.

Core material Ferrite

Core and winding loss See www.coilcraft.com/coreloss

Terminations RoHS compliant matte tin over nickel over phos

bronze. Other terminations available at additional cost.

Weight: 3.8 – 4.6 g

Ambient temperature –40°C to +85°C with

Irms current, +85°C to

+125°C with derated current

Storage temperature Component: –40°C to +125°C.

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

Resistance to soldering heat Max three 40 second reflows at

+260°C, parts cooled to room temperature between cycles

Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /

85% relative humidity)

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

38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Packaging 500/13

″ reel; Plastic tape: 24 mm wide, 0.5 mm thick,

16 mm pocket spacing, 8.7 mm pocket depth

PCB washing Tested with pure water or alcohol only. For other

solvents, see Doc787_PCB_Washing.pdf.

• 12.3 × 12.3 mm footprint; 8 mm high shielded inductors

• Low DCR and excellent current handling