© Coilcraft, Inc. 2010
Specifications subject to change without notice.
Please check our website for latest information.
Document 580-1
CoupledInductors–LPD4012
The LPD4012 coupled miniature shielded inductors are
only 1,1 mm high and 4 mm square. Their excellent
coupling coefficient (k
≥ 0.94) makes them ideal for use
in SEPIC applications. In SEPIC topologies, the re-
quired inductance for each winding in a coupled induc-
tor is half the value needed for two separate inductors,
allowing selection of a part with lower DCR and higher
current handling.
These inductors provide high efficiency and excellent
current handling in a rugged, low cost part.
They can also be used as two single inductors con-
nected in series or parallel, as a common mode choke
or as a 1 : 1 transformer.
For SEPIC and other
Applications
0.060
1,52
0.0433 ±0.004
1,10 ±0,10
Dash
number
Internal
code
Dot indicates pin 1
0.155 ±0.003
3,94 ±0,076
0.155 ±0.003
3,94 ±0,076
XXX X
14
23
Recommended
Land Pattern
0.174
4,40
0.103
2,606
0.103
2,606
0.049
1,24
0.049
1,24
0.174
4,40
0.031
0,78
45°
typ
1
4
2
3
Core material Ferrite
Core and winding loss See www.coilcraft.com/coupledloss
Weight 54 – 64 mg
Terminations RoHS compliant silver-palladium-platinum-glass frit.
Other terminations available at additional cost.
Ambient temperature –40°C to +85°C with
Irms current, +85°C to
+125°C with derated current
Storage temperature Component: –40°C to +125°C.
Packaging: –40°C to +80°C
Winding to winding isolation 100 V
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 1000/7
″reel; 3500/13″ reel Plastic tape: 12 mm wide,
0.25 mm thick, 8 mm pocket spacing, 1.32 mm pocket depth
Recommended pick and place nozzle OD: 4 mm; ID:
≤ 2 mm
PCB washing Only pure water or alcohol recommended
Document 580-1
Revised 09/18/09
2
1
4
3
L1
L2
L1
L2
Q1
C1
C2
+
++
––
D1
VOUT
VIN
Load
Typical SEPIC schematic
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
Dimensions are in
inches
mm
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