COILCRAFT MSS1278

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
Part number1
MSS1278-142ML_
MSS1278-472ML_
MSS1278-562ML_
MSS1278-682ML_
MSS1278-822ML_
Inductance2
(µH)
1.4 ±20%
4.7 ±20%
5.6 ±20%
6.8 ±20%
8.2 ±20%
DCR3
(mOhms)
typ
max
Isat (A)5
Irms (A)6
SRF
typ4 10% 20% 30% 20°C 40°C
(MHz) drop drop drop rise rise
8.8
13.9
15.7
19.1
20.3
9.8
15.5
17.5
21.3
22.6
80.0
30.0
24.0
21.0
20.0
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
10.00
6.20
6.20
6.00
5.90
MSS1278-103ML_
MSS1278-123ML_
MSS1278-153ML_
MSS1278-183ML_
MSS1278-223ML_
10 ±20%
12 ±20%
15 ±20%
18 ±20%
22 ±20%
21.8
23.2
27.9
30.8
35.5
24.3
25.8
31.0
34.3
39.5
17.0
15.0
13.0
12.0
11.0
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
4.00
3.70
3.50
3.00
2.90
5.70
5.20
4.90
4.50
4.00
MSS1278-273ML_
MSS1278-333ML_
MSS1278-393ML_
MSS1278-473ML_
MSS1278-563ML_
27 ±20%
33 ±20%
39 ±20%
47 ±20%
56 ±20%
45.0
61.9
69.1
72.3
80.2
50.0
68.8
76.8
80.4
89.2
10.0
9.5
8.5
7.5
7.0
5.80
5.22
4.68
4.40
4.02
6.56
5.90
5.42
5.02
4.60
7.02
6.30
5.80
5.32
4.90
2.60
2.30
2.10
2.00
1.90
3.60
3.10
3.00
2.90
2.70
MSS1278-683ML_
MSS1278-823ML_
MSS1278-104ML_
MSS1278-124KL_
MSS1278-154KL_
68 ±20%
82 ±20%
100 ±20%
120 ±10%
150 ±10%
91.3
125.9
135.1
182.3
216.5
101.5
139.9
150.2
202.6
240.6
6.5
5.0
4.5
4.3
4.1
3.40
3.12
2.88
2.62
2.48
3.86
3.58
3.28
3.00
2.86
4.26
3.80
3.52
3.24
3.02
1.80
1.60
1.50
1.40
1.30
2.60
2.30
2.20
1.90
1.80
MSS1278-184KL_
MSS1278-224KL_
MSS1278-274KL_
MSS1278-334KL_
MSS1278-394KL_
180 ±10%
220 ±10%
270 ±10%
330 ±10%
390 ±10%
229.0
323.6
415.6
487.3
533.6
254.5
359.6
461.8
541.5
592.9
4.0
3.4
3.1
2.9
2.7
2.26
1.96
1.74
1.66
1.52
2.58
2.22
2.04
1.86
1.72
2.74
2.36
2.18
2.00
1.88
1.20
1.00
0.90
0.80
0.75
1.70
1.60
1.20
1.00
1.00
707.5 786.2
777.4 863.8
1045 1162
1166 1296
1334 1483
2.2
2.0
1.7
1.4
1.3
1.34
1.24
1.16
1.04
0.97
1.54
1.42
1.28
1.16
1.10
1.64
1.50
1.38
1.26
1.14
0.66
0.60
0.55
0.50
0.48
0.90
0.80
0.75
0.70
0.68
MSS1278-474KL_ 470 ±10%
MSS1278-564KL_ 560 ±10%
MSS1278-684KL_ 680 ±10%
MSS1278-824KL_ 820 ±10%
MSS1278-105KL_ 1000 ±10%
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
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 Components” before soldering.
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2009
Document 322-1
Revised 12/01/08
Document 322-2
SMT Power Inductors – MSS1278
Typical L vs Current
Typical L vs Frequency
10000
10000
1000 µH
Inductance (µH)
Inductance (µH)
100 µH
100
1000 µH
1000
1000
10 µH
10
100 µH
100
10 µH
10
4.7 µH
4.7 µH
1
1
0.1
10
1
100
0.01
10
Frequency (MHz)
0.484
max
12,3
Typical Current Derating
120
110
0.484
max
12,3
100
90
123
X
Dash number
Internal code
Parts manufactured prior
to Sept. 2007 were marked
with only the dash number.
80
70
60
0.317
max
8,05
50
40
30
20
25°C
Percent of rated current
1
0.1
Current (A)
Isat
Irms
10
0
-40
-20
0
0.197
5,0
20
40
60
80
100
120 140
Recommended
Land Pattern
0.217
5,5
0.157
4,0
0.138
3,5
Ambient temperature (°C)
0.197
5,0
Dimensions are in
0.334
8,5
inches
mm
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2009
0.025
0,635
Document 322-2
Revised 12/01/08