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UK
Taiwan
China
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+1-847-639-6400 sales@coilcraft.com
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+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2018
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 833-1
Coupled Inductors LPD6235 For Flyback, SEPIC, Zeta
and other Applications
Document 833-1 Revised 09/08/14
Dimensions are in inches
mm
0.079
2,00
0.138
3,5 max
Dash
number Internal
code
Dot indicates pin 1
0.236 ±0.003
6,0 ±0,08
0.236 ±0.003
6,0 ±0,08
XXX X
14
23
Recommended
Land Pattern
0.260
6,60
0.167
4,25
0.167
4,25
0.079
2,00
0.079
2,00
0.260
6,60
0.047
1,20
45°
typ
14
23
Tight coupling (k ≥ 0.97) makes the LPD6235 series of
coupled inductors ideal for use in a variety of circuits
including flyback, multi-output buck, SEPIC and Zeta.
These coupled miniature shielded inductors are 3.5 mm
high and 6.0 mm square. They provide high inductance,
high efficiency and excellent current handling in low cost
part.
They can be used as two single inductors connected in
series or parallel, as a common mode choke or as a 1 : 1
transformer.
2
14
3
L1
L2
L1 L2
++
–
–
D
C
C
Typical Flyback Converter
VOUT
V
IN
SW
L1
L2
++
+
––
–
D
D
C
C
SW
Typical Buck Converter with auxiliary output
VOUT
VOUTAU
X
V
IN
Typical Zeta schematic
VOUT
V
IN L1
L2
QC1
CC
++
––
D
Typical SEPIC schematic
VOUT
V
IN
L1
L2
Q
C1
C
C
++
––
D
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2018
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.
Coupled Inductors – LPD6235 Series
Document 833-2
Document 833-2 Revised 009/08/14
DCR SRF Coupling
Leakage5 Isat (A)6 Irms (A)
Inductance2 max3 typ4 coefficient L typ 10% 20% 30% both one
Part number1 ±20% (µH) (Ohms) (MHz) typ (µH) drop drop drop windings7 winding8
LPD6235-682ME_ 6.8 0.120 31 0.99 0.10 2.80 3.00 3.12 1.40 1.98
LPD6235-103ME_ 10 0.157 26 0.99 0.12 2.50 2.70 2.80 1.30 1.83
LPD6235-223ME_ 22 0.300 15 >0.99 0.15 1.50 1.67 1.73 0.85 1.20
LPD6235-473ME_ 47 0.620 9.7 >0.99 0.21 0.90 0.98 0.99 0.60 0.85
LPD6235-104ME_ 100 1.20 7.0 >0.99 0.45 0.62 0.72 0.74 0.40 0.56
LPD6235-474ME_ 470 3.50 3.0 >0.99 0.61 0.18 0.22 0.23 0.25 0.35
LPD6235-105ME_ 1000 7.00 1.9 >0.99 1.05 0.12 0.14 0.15 0.15 0.21
LPD6235-155ME_ 1500 10.8 1.5 >0.99 1.70 0.12 0.12 0.13 0.14 0.20
LPD6235-205ME_ 2000 16.0 1.3 >0.99 2.10 0.08 0.11 0.12 0.11 0.16
1. Please specify termination and packaging codes:
LPD6235-205MEC
Termination: E = RoHS compliant Silver-palladium-platinum-glass frit.
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 (350 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 (1500 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 wind-
ings.
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.
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.
Core material Ferrite
Core and winding loss Go to online calculator
Weight 420 – 480 mg
Environmental RoHS compliant, halogen free
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.
Tape and reel packaging: –40°C to +80°C
Winding to winding isolation 100 Vrms, one minute
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 350/7″ reel; 1500/13″ reel Plastic tape: 16 mm wide,
0.3 mm thick, 12 mm pocket spacing, 3.68 mm pocket depth
Recommended pick and place nozzle OD: 6.2 mm; ID: ≤ 3.1 mm
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2018
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.
Coupled Inductors – LPD6235 Series
Document 833-3
Document 833-3 Revised 009/08/14
L vs Current
Typical Current Derating
L vs Frequency
-40 -20 020406080100 140120
Ambient temperature (°C)
Percent of rated current
120
110
100
90
80
70
60
50
40
30
20
10
0
Isat
Irms
25°C
1
10
100
1000
10000
Inductance (µH)
0.1 1
100
10
Frequency (MHz)
1000 µH
1500 µH
2000 µH
6.8 µH
47 µH
100 µH
470 µH
22 µH
10 µH
1000 µH
6.8 µH
47 µH
22 µH
10 µH
2000 µH
1500 µH
470 µH
100 µH
1
10
100
1000
10000
Inductance (µH)
0.01 0.1 101
Current (A)
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Coilcraft:
LPD6235-103MEC LPD6235-474MEC LPD6235-474MEB LPD6235-473MEB LPD6235-105MEC LPD6235-
155MEB LPD6235-682MEB LPD6235-223MEC LPD6235-205MEB LPD6235-103MEB LPD6235-155MEC
LPD6235-105MEB LPD6235-682MEC LPD6235-205MEC LPD6235-473MEC LPD6235-223MEB
