Document 499-1
Coupled Inductors
•
•
•
•
MSD1278
For Flyback, SEPIC, Zeta
and other Applications
Tight coupling (k
≥
0.98) and 500 V isolation
High inductance and high efficiency
Excellent current handling
Ideal for use in a variety of circuits including flyback, multi-output
buck, SEPIC and Zeta.
• Can also be used as two single inductors connected in series
or parallel or as a common mode choke.
+
D
+
L1
V
IN
C
SW
L2
C
V
OUT
–
–
Typical Flyback Converter
+
C
V
OUT
AUX
L2
+
V
IN
SW
D
D
–
0.484
max
12,3
Dot indicates pin1
Dash number
Internal code
+
L1
C
V
OUT
0.484
max
12,3
123
X
Parts manufactured
prior to Sept. 2007
were marked with
only the dash number.
–
–
Typical Buck Converter with auxiliary output
+
L1
C1
Q
V
IN
D
+
C
V
OUT
0.317
max
*
8,05
C
L2
Recommended
Land Pattern
0.217
5,5
–
0.197
5,0
0.138
3,5
0.197
5,0
3
2
4
1
Typical SEPIC schematic
–
0.157
4,0
2
3
+
0.177
4,5
4
1
+
Q
C1
L2
D
C
V
OUT
V
IN
C
L1
0.059
1,5
0.079
2,0
1
L1
3
2
L2
4
–
Typical Zeta schematic
–
*
For optional tin-lead and tin-silver-copper
inches
mm
terminations, dimensions are for the mounted
part. Dimensions before mounting can be
an additional 0.012 inch (0,3 mm).
Dimensions are in
1
:
1
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 499-1
Revised 04/05/13
© 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.
Document 499-2
Coupled Inductors – MSD1278 Series
Part
number
1
MSD1278-472ML_
MSD1278-562ML_
MSD1278-682ML_
MSD1278-822ML_
MSD1278-103ML_
MSD1278-123ML_
MSD1278-153ML_
MSD1278-183ML_
MSD1278-223ML_
MSD1278-273ML_
MSD1278-333ML_
MSD1278-393ML_
MSD1278-473ML_
MSD1278-563ML_
MSD1278-683ML_
MSD1278-823ML_
MSD1278-104ML_
MSD1278-124KL_
MSD1278-154KL_
MSD1278-184KL_
MSD1278-224KL_
MSD1278-274KL_
MSD1278-334KL_
MSD1278-394KL_
MSD1278-474KL_
MSD1278-564KL_
MSD1278-684KL_
MSD1278-824KL_
MSD1278-105KL_
Inductance
2
(µH)
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%
470 ±10%
560 ±10%
680 ±10%
820 ±10%
1000 ±10%
DCR max
3
(Ohms)
0.038
0.046
0.048
0.050
0.058
0.062
0.072
0.080
0.096
0.120
0.150
0.160
0.180
0.190
0.210
0.280
0.300
0.410
0.460
0.510
0.690
0.900
1.02
1.12
1.43
1.69
2.29
2.55
2.83
SRF typ
4
(MHz)
32.0
25.0
24.0
18.0
16.5
14.5
11.8
10.5
9.0
8.4
7.6
6.5
6.0
5.6
5.0
4.1
3.6
3.2
3.0
2.7
2.5
2.1
2.0
1.8
1.6
1.5
1.4
1.3
1.1
Coupling
coefficient
typ
0.98
0.98
0.98
0.98
0.98
0.98
0.99
0.99
0.99
0.99
0.99
0.99
0.99
0.99
0.99
0.99
>0.99
0.99
>0.99
>0.99
>0.99
>0.99
0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
Leakage
inductance
5
typ (µH)
0.22
0.23
0.22
0.34
0.34
0.36
0.41
0.37
0.41
0.43
0.56
0.64
0.70
0.76
0.88
0.85
0.90
1.31
1.46
0.93
1.54
1.17
4.14
1.64
0.25
2.68
2.11
2.39
4.28
Isat
6
(A)
14.9
13.4
13.1
10.8
10.5
9.6
9.1
8.0
6.8
6.5
5.6
5.5
5.2
4.5
4.1
3.8
3.4
3.2
2.8
2.5
2.3
2.1
1.9
1.7
1.6
1.5
1.3
1.2
1.1
Irms
(A)
both
one
windings
7
winding
8
3.16
2.87
2.81
2.76
2.56
2.48
2.30
2.18
1.99
1.78
1.59
1.54
1.45
1.41
1.35
1.16
1.13
0.96
0.91
0.86
0.74
0.65
0.61
0.58
0.50
0.47
0.41
0.39
0.37
4.47
4.06
3.98
3.90
3.62
3.50
3.25
3.08
2.81
2.52
2.25
2.18
2.05
2.00
1.90
1.65
1.59
1.36
1.29
1.22
1.05
0.92
0.86
0.82
0.70
0.67
0.58
0.55
0.52
1. When ordering, please specify
termination
and
packaging
code:
MSD1278-105KLD
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 shown for each winding, measured at 100 kHz, 0.1 Vrms, 0
Adc on an Agilent/HP 4284A LCR meter or equivalent. When leads are
connected in parallel, inductance is the same value. When leads are
connected in series, inductance is four times the value.
3. DCR is for each winding. When leads are connected in parallel, DCR
is half the value. When leads are connected in series, DCR is twice the
value.
4. SRF measured using an Agilent/HP 4191A or equivalent. When leads
are connected in parallel, SRF is the same value.
5. Leakage inductance is for L1 and is measured with L2 shorted.
6. DC current, at which the inductance drops 30% (typ) from its value
without current. It is the sum of the current flowing in both windings.
7. Equal current when applied to each winding simultaneously that causes
a 40°C temperature rise from 25°C ambient. See temperature rise calcu-
lation.
8. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
9. Electrical specifications at 25°C.
Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.”
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Coupled Inductor Core and Winding Loss Calculator
This web-based utility allows you to enter frequency, peak-to-peak
(ripple) current, and
Irms
current to predict temperature rise and overall
losses, including core loss.
Go to online calculator
.
Designer’s Kit C400
contains 3 each of all values.
Core material
Ferrite
Core and winding loss
Go to online calculator
Terminations
RoHS compliant matte tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight:
3.7 – 4.4 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
Winding-to-winding and winding-to-core isolation
500 Vrms
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.
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 499-2
Revised 04/05/13
© 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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