© Coilcraft, Inc. 2010
Specifications subject to change without notice.
Please check our website for latest information.
Document 528-1
Document 528-1
Revised 12/05/08
Coupled Inductors–MSD1260
Dimensions are in
inches
mm
The excellent coupling coefficient (k
≥ 0.94) makes the
MSD1260 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, allowing
selection of a part with lower DCR and higher current
handling.
These parts provide high inductance, high efficiency
and excellent current handling in a rugged, low cost
part. They are also well suited for use as a VRM
inductors in high-current DC-DC converters and VRM/
VRD controllers.
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.
Core material Ferrite
Terminations RoHS compliant matte tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight: 2.8 – 3.2 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
Winding to winding 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, 0.35 mm thick,
16 mm pocket spacing, 6.6 mm pocket depth
PCB washing Only pure water or alcohol recommended
Recommended
Land Pattern
0.217
5,5
0.177
4,5
0.157
4,0
0.079
2,0
1
4
2
3
3
1
2
4
L1
L2
123
X
0.197
5,0
0.059
1,5
0.197
5,0
0.138
3,5
0.484
12,3
max
0.484
12,3
max
Dash number
Internal code
1
4
2
3
0.236 ±0.008
6,0 ±0,2
Parts manufactured
prior to Sept. 2007
were marked with
only the dash number.
Dot indicates pin1
For SEPIC and other
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”