Document 704-1
Shielded Coupled Inductors MSD1278T
AEC
The MSD1278T series of shielded coupled inductors was
designed specifically for high temperature applications –
up to 125°C ambient.
+
Q200 125°C
Tight coupling (k ≥ 0.98) and 500 V isolation make them
ideal for use in a variety of circuits including flyback, multi-
output buck, SEPIC and Zeta. These parts provide high
inductance, high efficiency and excellent current handling.
They can also be used as two single inductors connected
in series or parallel or as a common mode choke.
+
+
D
C
V
L1
L2
OUT
C
V
IN
–
SW
–
Typical Flyback Converter
+
OUT
D
V
0.484
12,3
C
AUX
L2
max
–
Dot indicates pin1
Dash number
+
+
1 2 3
L1
0.484
12,3
max
V
OUT
V
C
D
IN
SW
X
–
–
Internal code
Typical Buck Converter with auxiliary output
D
0.308 0.010
7,8 0,25
*
+
+
L1
C1
Recommended
Land Pattern
V
C
Q
L2
C
OUT
V
IN
0.217
5,5
0.197
5,0
–
+
–
0.157
4,0
0.138
3,5
Typical SEPIC schematic
2
3
1
4
3
4
1
0.197
5,0
0.177
4,5
2
+
L2
C1
Q
V
D
C
C
OUT
V
L1
0.059
1,5
0.079
2,0
IN
For optional tin-lead and tin-silver-copper
terminations, dimensions are for the mounted
part. Dimensions before mounting can be
an additional 0.012 inch (0,3 mm).
–
–
*
Typical Zeta schematic
1
2
L1
L2
4
3
inches
mm
Dimensions are in
Document 704-1 Revised 02/16/22
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© Coilcraft Inc. 2022
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.