© Coilcraft, Inc. 2010
Specifications subject to change without notice.
Please check our website for latest information.
Document 621-1
Document 621-1
Revised 11/10/09
CoupledInductors–MSD7342Series
The excellent coupling coefficient (k
≥ 0.94) makes the
MSD7342 series of coupled inductors ideal for use in
SEPIC applications. In SEPIC topologies, the required
inductance for each winding in a coupled inductor is
half the value needed for two separate inductors, allow-
ing selection of a part with lower DCR and higher
current handling.
These inductors provide high inductance, high efficiency
and excellent current handling in a rugged, low cost part.
They can also be used as two single inductors con-
nected in series or parallel, as a common mode choke
or as a 1 : 1 transformer.
Dimensions are in
inches
mm
Core material Ferrite
Terminations RoHS compliant matte tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 0.76 – 0.87g
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
Winding to winding isolation 200 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 250/7
″ reel; 1000/13″ reel Plastic tape: 16 mm wide,
0.4 mm thick, 12 mm pocket spacing, 4.9 mm pocket depth
PCB washing Only pure water or alcohol recommended
For SEPIC
Applications
L1
L2
Q1
C1
C2
+
++
––
D1
VOUT
VIN
Load
Typical SEPIC schematic
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
0.295
7,5
max
0.295
7,5
max
max
Dot indicates
pin 1
0.150
3,8
0.091
2,3
0.063
1,6
0.028
0,7
0.181
4,6
123
0.110
2,8
0.083
2,1
0.130
3,3
0.043
1,10
1
4
2
3
3
1
2
4
L1
L2
Recommended
Land Pattern
1
4
2
3
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