Document 580-1
Shielded Coupled Inductors LPD4012
Only 1.1 mm high and 4 mm square
Ideal for use in flyback, multi-output buck and SEPIC
applications.
High inductance, high efficiency and excellent current handling
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
+
D V
OUT
C AUX
L2
++
L1
V
V C OUT
D
IN
SW
Dot indicates pin 1
14
1 4
Typical Buck Converter with auxiliary output
0.155 0.003*
L1 L2
3,94 0,076
D
++
XXXX
23
2 3
C1
L1
V
C
V Q L2 C OUT
IN
Dash Internal
number code
0.155 0.003*
Typical SEPIC schematic
3,94 0,076
Recommended
0.0433 0.004*
Core material Ferrite
Land Pattern
1,10 0,10
Core and winding loss Go to online calculator
++
Weight 54 64 mg L2
C1
1
4
45
Q
typ
Environmental RoHS compliant, halogen free
V
CCD OUT
V L1
0.031
IN
Terminations RoHS compliant matte tin over nickel over silver.
0,78
0.103 0.049
0.174
Other terminations available at additional cost.
2,61 1,25
4,40
Ambient temperature 40C to +85C with (40C rise) Irms current.
Typical Zeta schematic
Maximum part temperature +125C (ambient + temp rise).
2 3
Storage temperature Component: 40C to +125C.
0.049
0.060
Tape and reel packaging: 40C to +80C
1,25
1,52
Winding to winding isolation 100 Vrms, one minute
0.103
* Dimensions are of the case not including Resistance to soldering heat Max three 40 second reflows at
2,61
the termination. For maximum overall
+260C, parts cooled to room temperature between cycles
0.174
dimensions including the termination, add
4,40
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30C /
0.005 in/ 0.13 mm.
85% relative humidity)
For optional tin-lead and tin-silver-copper
terminations, dimensions are for the
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
inches
mounted part. Dimensions before mounting
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Dimensions are in
can be an additional 0.005 in/ 0.13 mm. mm
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
Packaging 1000/7 reel; 3500/13 reel Plastic tape: 12 mm wide, aqueous wash. See Doc787_PCB_Washing.pdf.
0.25 mm thick, 8 mm pocket spacing, 1.32 mm pocket depth
Recommended pick and place nozzle OD: 4 mm; ID: 2 mm
Document 580-1 Revised 02/24/17
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com Coilcraft Inc. 2018
This product may not be used in medical or high
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
risk applications without prior Coilcraft approval.
China +86-21-6218 8074 sales@coilcraft.com.cn
Specification subject to change without notice.
Please check web site for latest information.
Singapore + 65-6484 8412 sales@coilcraft.com.sgDocument 580-2
Coupled Inductors for SEPIC Applications LPD4012 Series
6
Isat (A) Irms (A)
Coupling Leakage
2 3 4 5
Inductance DCR max SRF typ coefficient L typ 10% 20% 30% both one
1 7 8
Part number (H) (Ohms) (MHz) typ (H) drop drop drop windings winding
LPD4012-331NR_ 0.33 30% 0.042 255 0.94 0.06 5.2 5.4 5.6 1.87 2.65
LPD4012-561NR_ 0.56 30% 0.087 185 0.95 0.08 3.7 3.8 3.9 1.30 1.84
LPD4012-821NR_ 0.82 30% 0.100 130 0.97 0.09 3.2 3.3 3.4 1.21 1.72
LPD4012-152NR_ 1.5 30% 0.185 86 0.97 0.11 2.50 2.81 2.91 1.15 1.62
LPD4012-222NR_ 2.2 30% 0.235 70 0.98 0.14 2.30 2.40 2.50 0.95 1.35
LPD4012-332NR_ 3.3 30% 0.320 48 0.98 0.16 1.80 1.90 2.00 0.75 1.06
LPD4012-472MR_ 4.7 20% 0.500 39 0.98 0.18 1.70 1.80 1.90 0.65 0.92
LPD4012-562MR_ 5.6 20% 0.620 32 0.99 0.20 1.60 1.70 1.80 0.55 0.78
LPD4012-682MR_ 6.8 20% 0.530 31 0.99 0.22 1.20 1.52 1.63 0.60 0.86
LPD4012-822MR_ 8.2 20% 0.600 29 0.99 0.24 1.10 1.20 1.30 0.55 0.78
LPD4012-103MR_ 10 20% 0.750 25 0.99 0.26 0.98 1.00 1.10 0.50 0.71
LPD4012-153MR_ 15 20% 1.13 21 0.99 0.30 0.90 0.92 0.94 0.43 0.60
LPD4012-223MR_ 22 20% 1.63 15 0.99 0.34 0.70 0.82 0.84 0.34 0.48
LPD4012-333MR_ 33 20% 1.83 12 >0.99 0.41 0.37 0.57 0.58 0.31 0.44
LPD4012-473MR_ 47 20% 2.52 8.8 >0.99 0.51 0.33 0.39 0.40 0.28 0.39
LPD4012-683MR_ 68 20% 3.23 7.8 >0.99 0.66 0.27 0.36 0.37 0.25 0.36
LPD4012-823MR_ 82 20% 3.66 7.3 >0.99 0.75 0.27 0.27 0.29 0.23 0.31
LPD4012-104MR_ 100 20% 4.76 6.1 >0.99 0.86 0.22 0.28 0.29 0.20 0.27
LPD4012-124MR_ 120 20% 5.54 5.3 >0.99 0.98 0.21 0.26 0.27 0.19 0.27
LPD4012-154MR_ 150 20% 6.90 4.6 >0.99 1.19 0.18 0.26 0.27 0.17 0.23
LPD4012-184MR_ 180 20% 8.75 4.1 >0.99 1.40 0.16 0.21 0.23 0.14 0.18
LPD4012-224MR_ 220 20% 11.24 3.3 >0.99 1.66 0.15 0.16 0.17 0.12 0.17
LPD4012-334MR_ 330 20% 17.00 2.8 >0.99 2.45 0.13 0.16 0.16 0.10 0.14
1. Please specify termination and packaging codes: Coupled Inductor Core and Winding Loss Calculator
This web-based utility allows you to enter frequency, peak-to-peak
LPD4012-334MRC
(ripple) current, and Irms current to predict temperature rise and
Termination: R = RoHS compliant, matte tin over nickel over silver.
overall losses, including core loss. Go to online calculator.
Special order:
Q = RoHS tin-silver-copper (95.5/4/0.5) or
P = non-RoHS tin-lead (63/37).
Packaging: C = 7 machine-ready reel. EIA-481 embossed plastic
tape (1000 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 (3500 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 25C that causes the specified inductance drop 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 40C temperature rise from 25C ambient. This information is
for reference only and does not represent absolute maximum ratings.
8. Maximum current when applied to one winding that causes a 40C
temperature rise from 25C ambient. This information is for reference
only and does not represent absolute maximum ratings.
9. Electrical specifications at 25C.
Refer to Doc 639 Selecting Coupled Inductors for SEPIC Applications.
Refer to Doc 362 Soldering Surface Mount Components before soldering.
Document 580-2 Revised 02/27/17
US +1-847-639-6400 sales@coilcraft.com
Document 580-2 Revised 02/15/11
UK +44-1236-730595 sales@coilcraft-europe.com Coilcraft Inc. 2018
This product may not be used in medical or high
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
risk applications without prior Coilcraft approval.
China +86-21-6218 8074 sales@coilcraft.com.cn
Specification subject to change without notice.
Please check web site for latest information.
Singapore + 65-6484 8412 sales@coilcraft.com.sg