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.
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
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 08/18/11
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 Compo-
nents” 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
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