Document 322-1
SMT Power Inductors – MSS1278
• 12.3 × 12.3 mm footprint; 8 mm high shielded inductors
• Low DCR and excellent current handling
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.
DCR
3
(mOhms)
typ
max
8.8
13.9
15.7
19.1
20.3
21.8
23.2
27.9
30.8
35.5
45.0
61.9
69.1
72.3
80.2
91.3
125.9
135.1
182.3
216.5
229.0
323.6
415.6
487.3
533.6
9.8
15.5
17.5
21.3
22.6
24.3
25.8
31.0
34.3
39.5
50.0
68.8
76.8
80.4
89.2
101.5
139.9
150.2
202.6
240.6
254.5
359.6
461.8
541.5
592.9
Isat
(A)
5
Irms
(A)
6
SRF
typ
4
10% 20% 30% 20°C 40°C
(MHz) drop drop drop rise rise
80.0
30.0
24.0
21.0
20.0
17.0
15.0
13.0
12.0
11.0
10.0
9.5
8.5
7.5
7.0
6.5
5.0
4.5
4.3
4.1
4.0
3.4
3.1
2.9
2.7
2.2
2.0
1.7
1.4
1.3
25.2
13.7
12.2
11.3
10.1
28.6
15.2
13.7
12.7
11.5
30.6
15.9
14.6
13.7
12.3
7.00
4.30
4.30
4.20
4.10
4.00
3.70
3.50
3.00
2.90
2.60
2.30
2.10
2.00
1.90
1.80
1.60
1.50
1.40
1.30
1.20
1.00
0.90
0.80
0.75
0.66
0.60
0.55
0.50
0.48
10.00
6.20
6.20
6.00
5.90
5.70
5.20
4.90
4.50
4.00
3.60
3.10
3.00
2.90
2.70
2.60
2.30
2.20
1.90
1.80
1.70
1.60
1.20
1.00
1.00
0.90
0.80
0.75
0.70
0.68
Document 322-1
Revised 04/04/13
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.
Part number
1
MSS1278-142ML_
MSS1278-472ML_
MSS1278-562ML_
MSS1278-682ML_
MSS1278-822ML_
MSS1278-103ML_
MSS1278-123ML_
MSS1278-153ML_
MSS1278-183ML_
MSS1278-223ML_
MSS1278-273ML_
MSS1278-333ML_
MSS1278-393ML_
MSS1278-473ML_
MSS1278-563ML_
MSS1278-683ML_
MSS1278-823ML_
MSS1278-104ML_
MSS1278-124KL_
MSS1278-154KL_
MSS1278-184KL_
MSS1278-224KL_
MSS1278-274KL_
MSS1278-334KL_
MSS1278-394KL_
Inductance
2
(µH)
1.4 ±20%
4.7 ±20%
5.6 ±20%
6.8 ±20%
8.2 ±20%
10 ±20%
12 ±20%
15 ±20%
18 ±20%
22 ±20%
27 ±20%
33 ±20%
39 ±20%
47 ±20%
56 ±20%
68 ±20%
82 ±20%
100 ±20%
120 ±10%
150 ±10%
180 ±10%
220 ±10%
270 ±10%
330 ±10%
390 ±10%
9.36 10.6 11.2
8.84 10.0 10.7
7.30 8.36 9.00
6.10 7.10 7.74
6.04 6.78 7.24
5.80
5.22
4.68
4.40
4.02
3.40
3.12
2.88
2.62
2.48
2.26
1.96
1.74
1.66
1.52
1.34
1.24
1.16
1.04
0.97
6.56
5.90
5.42
5.02
4.60
3.86
3.58
3.28
3.00
2.86
2.58
2.22
2.04
1.86
1.72
1.54
1.42
1.28
1.16
1.10
7.02
6.30
5.80
5.32
4.90
4.26
3.80
3.52
3.24
3.02
2.74
2.36
2.18
2.00
1.88
1.64
1.50
1.38
1.26
1.14
MSS1278-474KL_ 470 ±10%
MSS1278-564KL_ 560 ±10%
MSS1278-684KL_ 680 ±10%
MSS1278-824KL_ 820 ±10%
MSS1278-105KL_ 1000 ±10%
707.5 786.2
777.4 863.8
1045 1162
1166 1296
1334 1483
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
© 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.
Document 322-2
SMT Power Inductors – MSS1278
Typical L vs Current
10000
Typical L vs Frequency
10000
1000
1000 µH
1000
1000 µH
Inductance (µH)
Inductance (µH)
100
100 µH
100
100 µH
10
10 µH
4.7 µH
10
10 µH
4.7 µH
1
0.1
1
10
100
1
0.01
0.1
Current (A)
Frequency (MHz)
1
10
Typical Current Derating
120
110
0.472 ±0.012
12,0 ±0,3
0.472 ±0.012
12,0 ±0,3
Percent of rated current
100
90
80
70
60
50
40
0.307 ±0.010
7,8 ±0,25
123
X
Dash number
Internal code
Parts manufactured prior
to Sept. 2007 were marked
with only the dash number.
25°C
30
20
10
0
Isat
Irms
-40
-20
0
20
0.197 ±0.008
5,0 ±0,2
0.025
0,635
Recommended
Land Pattern
0.217
5,5
0.157
4,0
40
60
80
100
120 140
0.138 ±0.008
3,5 ±0,2
0.197 ±0.008
5,0 ±0,2
Ambient temperature (°C)
0.334
8,5
Dimensions are in
inches
mm
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 322-2
Revised 04/04/13
© 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.
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