© Coilcraft, Inc. 2009
Specifications subject to change without notice.
Please check our website for latest information.
1. Please specify termination and packaging codes:
MSS1278-105K
LD
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
using 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 Compo-
nents” before soldering.
Document 322-1
Document 322-1
Revised 12/01/08
SMT Power Inductors – MSS1278
DCR3
SRF
Isat (A)5
Irms (A)6
Inductance2
(mOhms)
typ4
10% 20%
30% 20°C 40°C
Part number1
(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.
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, 0.4 mm thick,
16 mm pocket spacing, 8.1 mm pocket depth
PCB washing Only pure water or alcohol recommended
• 12.3 × 12.3 mm footprint; 8 mm high shielded inductors
• Low DCR and excellent current handling
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