MSD7342

Document 621-1
Coupled Inductors MSD7342
For Flyback, SEPIC, Zeta
and other Applications
• Tight coupling (k ≥ 0.97) and 200 V isolation make the MSD7342
series of coupled inductors ideal for use in a variety of circuits
including flyback, multi-output buck and SEPIC.
• They provide high inductance, high efficiency and excellent
current handling in a rugged, low cost part.
• Can also be used as two single inductors connected in series
or parallel, as a common mode choke or as a 1 : 1 transformer.
+
+
D
L1
C
L2
VOUT
C
VIN
–
SW
–
Typical Flyback Converter
D
L2
+
VOUT
C
AUX
–
0.295
max
7,5
0.295
max
7,5
+
Dot indicates
pin 1
VIN
1
2
L1
L2
4
3
1
0.063
1,6
Dimensions are in
D
+
L1
C
0.110
2,8
If board traces
are run in these
areas, consider
masking them to
prevent shorting.
3
4
C
0.130
3,3
VIN
–
VOUT
–
Typical SEPIC schematic
+
L2
C1
Q
1
L2
+
0.083
2,1
2
+
C1
Q
Recommended
Land Pattern
0.091
2,3
2
–
–
0.028
0,7
0.150
3,8
VOUT
C
Typical Buck Converter with auxiliary output
VIN
0.181
max
4,6
4
D
SW
–
123
3
+
L1
L1
C
D
Typical Zeta schematic
C
VOUT
–
0.043
1,10
inches
mm
Specifications subject to change without notice.
Please check our website for latest information.
Document 621-1 Revised 11/09/15
Document 621-2
Coupled Inductors – MSD7342 Series
Isat (A)6 Irms (A)
CouplingLeakage 2
3
4
5
Inductance DCR max SRF typ coefficient
L typ
10% 20%
30%
both
one
Part number1
windings7 winding8
±20% (µH) (Ohms)
(MHz)
typ
(µH)
drop
drop drop
MSD7342-252ML_
2.5
MSD7342-332ML_
3.3
MSD7342-472ML_
4.7
MSD7342-562ML_
5.6
MSD7342-682ML_
6.8
MSD7342-822ML_
8.2
MSD7342-103ML_ 10
MSD7342-123ML_ 12
MSD7342-153ML_ 15
MSD7342-183ML_ 18
MSD7342-223ML_ 22
MSD7342-273ML_ 27
MSD7342-333ML_ 33
MSD7342-393ML_ 39
MSD7342-473ML_ 47
MSD7342-563ML_ 56
MSD7342-683ML_ 68
MSD7342-823ML_
82
MSD7342-104ML_ 100
MSD7342-124ML_ 120
MSD7342-154ML_ 150
MSD7342-184ML_ 180
MSD7342-224ML_ 220
MSD7342-274ML_ 270
MSD7342-334ML_ 330
MSD7342-394ML_ 390
MSD7342-474ML_ 470
MSD7342-564ML_ 560
MSD7342-684ML_ 680
MSD7342-824ML_ 820
MSD7342-105ML_ 1000
0.033 55
0.037 43
0.051 35
0.063 32
0.070 30
0.075 27
0.100 22
0.120 20
0.130 18
0.170 15
0.220 13.5
0.250 12.0
0.270 11.0
0.380 10.0
0.420 9.5
0.460 8.7
0.600 7.3
0.680 6.2
0.770 5.5
1.03
4.5
1.35
4.0
1.52
3.8
1.72
3.5
2.41
3.3
2.70
3.0
3.05
2.8
4.00
2.6
4.43
2.5
5.00
2.3
6.80
2.2
7.80
2.0
0.97
0.99
0.99
0.99
0.99
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
1. When ordering, please specify termination and packaging codes:
MSD7342-105MLC
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:C
=7″ machine-ready reel. EIA-481 embossed plastic
tape (250 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 C instead.
D
=13″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (1000 parts per
full reel).
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.
0.14 6.0 6.26.3
0.09 5.2 5.35.4
0.11 4.1 4.34.6
0.09 3.9 4.14.2
0.14 3.7 3.83.9
0.25 3.3 3.43.5
0.30 2.8 2.93.0
0.36 2.5 2.62.7
0.49 2.2 2.32.4
0.16 2.0 2.22.3
0.20 1.9 2.02.1
0.20 1.7 1.81.9
0.15 1.5 1.61.7
0.70 1.3 1.41.5
0.30 1.2 1.31.4
0.51 1.1 1.21.3
0.51 1.0 1.11.2
1.17 0.90 1.001.1
0.96 0.80 0.920.98
0.61 0.70 0.800.90
0.54 0.65 0.760.80
0.75 0.62 0.660.73
1.43 0.59 0.620.66
1.56 0.55 0.570.60
1.65 0.49 0.520.54
4.73 0.45 0.470.50
5.50 0.41 0.430.46
4.85 0.38 0.400.42
7.59 0.36 0.370.38
8.01 0.30 0.320.35
8.69 0.27 0.290.31
2.17
2.05
1.74
1.57
1.49
1.44
1.24
1.14
1.09
0.95
0.84
0.79
0.76
0.64
0.61
0.58
0.51
0.48
0.45
0.39
0.34
0.32
0.30
0.25
0.24
0.23
0.20
0.19
0.18
0.15
0.14
3.06
2.89
2.46
2.22
2.10
2.03
1.76
1.61
1.54
1.35
1.19
1.11
1.07
0.90
0.86
0.82
0.72
0.67
0.63
0.55
0.48
0.45
0.42
0.36
0.34
0.32
0.28
0.26
0.25
0.21
0.20
5. Leakage inductance is for L1 and is measured with L2 shorted.
6. DC current, at which the inductance drops the specified amount 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. This information is for reference only and does not represent absolute maximum ratings. To predict
temperature rise go to online calculator.
8. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. This information is for reference
only and does not represent absolute maximum ratings. To predict
temperature rise go to online calculator.
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
Specifications subject to change without notice.
Please check our website for latest information.
Document 621-2 Revised 11/09/15
Document 621-2 Revised 02/23/11
Document 621-3
Coupled Inductors – MSD7342 Series
Typical L vs Current
Typical L vs Frequency
10000
10000
1000 µH
100 µH
100
47 µH
10 µH
10
1000 µH
1000
470 µH
Inductance (µH)
Inductance (µH)
1000
470 µH
100 µH
100
47 µH
10 µH
10
4.7 µH
4.7 µH
1
0.01
1
0.1
10
1
0.1
Current (A)
1
10
100
Frequency (MHz)
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 0.76 – 0.87g
Ambient temperature –40°C to +85°C with (40°C rise) Irms current.
Maximum part temperature +125°C (ambient + temp rise).
Storage temperature Component: –40°C to +125°C.
Tape and reel 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 Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
Specifications subject to change without notice.
Please check our website for latest information.
Document 621-3 Revised 11/09/15
Document 621-3 Revised 02/23/11