© Coilcraft, Inc. 2010
Coupled Inductors for SEPIC Applications–MSD7342 Series
Specifications subject to change without notice.
Please check our website for latest information.
Document 621-2
Document 621-2
Revised 11/10/09
Irms (A)
Inductance2
DCR max3
SRF typ4
Isat (A)5
both
one
Part number1
±20% (µH)
(Ohms)
(MHz)
10% drop 20% drop 30% drop
windings6 winding7
MSD7342-252ML_
2.5
0.033
55
6.0
6.2
6.3
2.17
3.06
MSD7342-332ML_
3.3
0.037
43
5.2
5.3
5.4
2.05
2.89
MSD7342-472ML_
4.7
0.051
35
4.1
4.3
4.6
1.74
2.46
MSD7342-562ML_
5.6
0.063
32
3.9
4.1
4.2
1.57
2.22
MSD7342-682ML_
6.8
0.070
30
3.7
3.8
3.9
1.49
2.10
MSD7342-822ML_
8.2
0.075
27
3.3
3.4
3.5
1.44
2.03
MSD7342-103ML_
10
0.100
22
2.8
2.9
3.0
1.24
1.76
MSD7342-123ML_
12
0.120
20
2.5
2.6
2.7
1.14
1.61
MSD7342-153ML_
15
0.130
18
2.2
2.3
2.4
1.09
1.54
MSD7342-183ML_
18
0.170
15
2.0
2.2
2.3
0.95
1.35
MSD7342-223ML_
22
0.220
13.5
1.9
2.0
2.1
0.84
1.19
MSD7342-273ML_
27
0.250
12.0
1.7
1.8
1.9
0.79
1.11
MSD7342-333ML_
33
0.270
11.0
1.5
1.6
1.7
0.76
1.07
MSD7342-393ML_
39
0.380
10.0
1.3
1.4
1.5
0.64
0.90
MSD7342-473ML_
47
0.420
9.5
1.2
1.3
1.4
0.61
0.86
MSD7342-563ML_
56
0.460
8.7
1.1
1.2
1.3
0.58
0.82
MSD7342-683ML_
68
0.600
7.3
1.0
1.1
1.2
0.51
0.72
MSD7342-823ML_
82
0.680
6.2
0.90
1.00
1.1
0.48
0.67
MSD7342-104ML_
100
0.770
5.5
0.80
0.92
0.98
0.45
0.63
MSD7342-124ML_
120
1.03
4.5
0.70
0.80
0.90
0.39
0.55
MSD7342-154ML_
150
1.35
4.0
0.65
0.76
0.80
0.34
0.48
MSD7342-184ML_
180
1.52
3.8
0.62
0.66
0.73
0.32
0.45
MSD7342-224ML_
220
1.72
3.5
0.59
0.62
0.66
0.30
0.42
MSD7342-274ML_
270
2.41
3.3
0.55
0.57
0.60
0.25
0.36
MSD7342-334ML_
330
2.70
3.0
0.49
0.52
0.54
0.24
0.34
MSD7342-394ML_
390
3.05
2.8
0.45
0.47
0.50
0.23
0.32
MSD7342-474ML_
470
4.00
2.6
0.41
0.43
0.46
0.20
0.28
MSD7342-564ML_
560
4.43
2.5
0.38
0.40
0.42
0.19
0.26
MSD7342-684ML_
680
5.00
2.3
0.36
0.37
0.38
0.18
0.25
MSD7342-824ML_
820
6.80
2.2
0.30
0.32
0.35
0.15
0.21
MSD7342-105ML_
1000
7.80
2.0
0.27
0.29
0.31
0.14
0.20
1. Please specify termination and packaging codes:
MSD7342-105M
LC
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.
5. 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.
6. Equal current when applied to each winding simultaneously that causes
a 40°C temperature rise from 25°C ambient. See temperature rise
calculation.
7. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
8. 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.
Temperature rise calculation based on specified Irms
Temperature rise ( t) = Winding power loss ×
129°C
W
Δ
Δt =
×
129°C
W
(
+
) × DCR
II
L1
2
L2
2
Winding power loss = (
+
) × DCR in Watts (W)
II
L1
2
L2
2
Example 1. MSD7342-123ML (Equal current in each winding)
Winding power loss = (1.14 + 1.14 ) × 0.120 = 0.312 W
t = 0.312 W ×
129°C
W
= 40°C
22
Δ
Example 2.
(
= 1.4 A,
Winding p
MSD7342-123ML
= 0.6 A)
II
L1
L2
22
ower loss = (1.4 + 0.6 ) × 0.120 = 0.278 W
t = 0.278 W ×
129°C
W
= 36°C
Δ
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. Visit www.coilcraft.com/coupledloss.
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