Coupled Inductors
–
MSD7342 Series
Specifications subject to change without notice.
Please check our website for latest information.
Document 621-2
Document 621-2 Revised 02/23/11
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© Coilcraft Inc. 2013
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.
Document 621-2 Revised 01/13/12
Coupling Leakage Isat (A)6 Irms (A)
Inductance2 DCR max3
SRF typ4 coefficient
L typ5 10% 20% 30% both one
Part number1 ±20% (µH) (Ohms) (MHz) typ (µH) drop drop drop windings7
winding8
MSD7342-252ML_ 2.5 0.033 55 0.97 0.14 6.0 6.2 6.3 2.17 3.06
MSD7342-332ML_ 3.3 0.037 43 0.99 0.09 5.2 5.3 5.4 2.05 2.89
MSD7342-472ML_ 4.7 0.051 35 0.99 0.11 4.1 4.3 4.6 1.74 2.46
MSD7342-562ML_ 5.6 0.063 32 0.99 0.09 3.9 4.1 4.2 1.57 2.22
MSD7342-682ML_ 6.8 0.070 30 0.99 0.14 3.7 3.8 3.9 1.49 2.10
MSD7342-822ML_ 8.2 0.075 27 0.98 0.25 3.3 3.4 3.5 1.44 2.03
MSD7342-103ML_ 10 0.100 22 0.98 0.30 2.8 2.9 3.0 1.24 1.76
MSD7342-123ML_ 12 0.120 20 0.98 0.36 2.5 2.6 2.7 1.14 1.61
MSD7342-153ML_ 15 0.130 18 0.98 0.49 2.2 2.3 2.4 1.09 1.54
MSD7342-183ML_ 18 0.170 15 >0.99 0.16 2.0 2.2 2.3 0.95 1.35
MSD7342-223ML_ 22 0.220 13.5 >0.99 0.20 1.9 2.0 2.1 0.84 1.19
MSD7342-273ML_ 27 0.250 12.0 >0.99 0.20 1.7 1.8 1.9 0.79 1.11
MSD7342-333ML_ 33 0.270 11.0 >0.99 0.15 1.5 1.6 1.7 0.76 1.07
MSD7342-393ML_ 39 0.380 10.0 0.99 0.70 1.3 1.4 1.5 0.64 0.90
MSD7342-473ML_ 47 0.420 9.5 >0.99 0.30 1.2 1.3 1.4 0.61 0.86
MSD7342-563ML_ 56 0.460 8.7 >0.99 0.51 1.1 1.2 1.3 0.58 0.82
MSD7342-683ML_ 68 0.600 7.3 >0.99 0.51 1.0 1.1 1.2 0.51 0.72
MSD7342-823ML_ 82 0.680 6.2 0.99 1.17 0.90 1.00 1.1 0.48 0.67
MSD7342-104ML_ 100 0.770 5.5 >0.99 0.96 0.80 0.92 0.98 0.45 0.63
MSD7342-124ML_ 120 1.03 4.5 >0.99 0.61 0.70 0.80 0.90 0.39 0.55
MSD7342-154ML_ 150 1.35 4.0 >0.99 0.54 0.65 0.76 0.80 0.34 0.48
MSD7342-184ML_ 180 1.52 3.8 >0.99 0.75 0.62 0.66 0.73 0.32 0.45
MSD7342-224ML_ 220 1.72 3.5 >0.99 1.43 0.59 0.62 0.66 0.30 0.42
MSD7342-274ML_ 270 2.41 3.3 >0.99 1.56 0.55 0.57 0.60 0.25 0.36
MSD7342-334ML_ 330 2.70 3.0 >0.99 1.65 0.49 0.52 0.54 0.24 0.34
MSD7342-394ML_ 390 3.05 2.8 0.99 4.73 0.45 0.47 0.50 0.23 0.32
MSD7342-474ML_ 470 4.00 2.6 0.99 5.50 0.41 0.43 0.46 0.20 0.28
MSD7342-564ML_ 560 4.43 2.5 >0.99 4.85 0.38 0.40 0.42 0.19 0.26
MSD7342-684ML_ 680 5.00 2.3 0.99 7.59 0.36 0.37 0.38 0.18 0.25
MSD7342-824ML_ 820 6.80 2.2 >0.99 8.01 0.30 0.32 0.35 0.15 0.21
MSD7342-105ML_ 1000 7.80 2.0 >0.99 8.69 0.27 0.29 0.31 0.14 0.20
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.
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. See temperature rise
calculation.
8. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
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.
Temperature rise calculation based on specified Irms
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.
Temperature rise ( t) = Winding power loss × 129°C
W
∆
∆t =×
129°C
W
(+) × DCRII
L12L22
Winding power loss = (+) × DCR in Watts (W)II
L1
L2
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
∆
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
= 36°C
∆