Document 982F-1
Coupled Chip Inductors – PFD3215
For Flyback,
SEPIC and other
applications
The PFD3215 has a footprint less than 3.2 × 2.3 mm,
making this shielded coupled inductor ideal for applications
with limited board space. It is designed for use in a variety
of circuits including flyback, multi-output buck and SEPIC.
These inductors provide high efficiency and excellent cur-
rent handling in a rugged, low cost part.
They can also be used as two single inductors connected
in series or parallel, as a wideband transformers or as a
common mode choke.
+
+
D
L1
V
IN
C
SW
L2
C
V
OUT
–
–
Typical Flyback Converter
L2
D
+
C
V
OUT
–
0.131
max
3,32
0.059 max
1,5
0.078
1,98
0.006
0,15
0.024
0,610
4
AUX
1
L1
2
L2
4
+
V
IN
SW
D
+
L1
C
V
OUT
–
3
Typical Buck Converter with auxiliary output
D
–
+
L1
0.088
2,24
V
IN
+
C
V
OUT
C1
Q
0.014 ±0.003
0,356 ±0,0762
1
2
L2
3
0.030
0,762
–
4
0.092
max
2,33
3
1
2
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
Typical SEPIC schematic
–
0.025
0,635
Recommended
Land Pattern
0.028
0,711
Dimensions are in
inches
mm
Core material
Ferrite
Core and winding loss
Go to online calculator
Environmental
RoHS compliant, halogen free
Weight
18 – 28 mg
Terminations
RoHS compliant silver-palladium-platinum-glass frit.
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
250 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
2000/7″ reel; 7500/13″ reel Plastic tape: 8 mm wide,
0.20 mm thick, 4 mm pocket spacing, 1.21 mm pocket depth
PCB washing
Tested with pure water or alcohol only. For other
solvents, see
Doc787_PCB_Washing.pdf.
Document 982F-1
Revised 12/05/12
Specifications subject to change
US
+1-847-639-6400 sales@coilcraft.com
without notice.
Please check
sales@coilcraft-europe.com
UK
+44-1236-730595
our website for latest information.
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2013
© Coilcraft Inc. 2013
This product may not be used in medical or high
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Specification subject to change without notice.
Please check web site for latest information.
Please check web site for latest information.
Document 982F-2
PFD3215 Coupled Inductors for SEPIC applications
Part number
1
PFD3215-391ME_
PFD3215-102ME_
PFD3215-182ME_
PFD3215-222ME_
PFD3215-332ME_
PFD3215-472ME_
PFD3215-682ME_
PFD3215-103ME_
Inductance
2
±20% (µH)
0.39
1.0
1.8
2.2
3.3
4.7
6.8
10
DCR
max
3
(Ohms)
0.070
0.123
0.250
0.265
0.360
0.450
0.630
1.25
SRF
typ
4
(MHz)
600
400
230
270
190
175
155
110
Coupling
coefficient
typ
0.89
0.95
0.97
0.97
0.98
0.98
0.98
0.98
Leakage
inductance
5
typ (µH)
0.08
0.09
0.11
0.13
0.14
0.17
0.25
0.31
10%
drop
2.10
1.35
1.00
0.95
0.75
0.65
0.55
0.45
Isat
(A)
6
20%
30%
drop
drop
2.30
1.55
1.20
1.05
0.83
0.75
0.65
0.50
2.40
1.65
1.30
1.15
0.90
0.80
0.70
0.55
Irms
(A)
both
one
windings
7
winding
8
0.98
0.85
0.60
0.57
0.55
0.51
0.40
0.27
1.39
1.20
0.85
0.81
0.78
0.72
0.57
0.38
1. When ordering, please specify
packaging
code:
PFD3215-103MEC
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic tape
(2000 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. Fac-
tory order only, not stocked (7500 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 the primary winding with the secondary windings
shorted.
6. DC current, at which the inductance drops the specified amount from its value
without current. It is the current flowing in one winding.
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.
PFD3215 Coupled Inductors for Flyback applications
Part number
1
PFD3215-391ME_
PFD3215-102ME_
PFD3215-182ME_
PFD3215-222ME_
PFD3215-332ME_
PFD3215-472ME_
PFD3215-682ME_
PFD3215-103ME_
Inductance
at 0 A
2
±20% (µH)
0.39
1.0
1.8
2.2
3.3
4.7
6.8
10
Inductance
at
Ipk
A
3
±20% (µH)
0.27
0.70
1.26
1.54
2.31
3.29
4.76
7.00
DCR
max
(Ohms)
0.070
0.123
0.250
0.265
0.335
0.442
0.600
1.22
Leakage
inductance
4
typ (µH)
0.08
0.09
0.11
0.13
0.14
0.17
0.25
0.31
Turns
ratio
1
:
1
1
:
1
1
:
1
1
:
1
1
:
1
1
:
1
1
:
1
1
:
1
Ipk
3
(A)
2.40
1.65
1.30
1.15
0.90
0.80
0.70
0.55
1. When ordering, please specify
packaging
code:
PFD3215-103MEC
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic
tape (2000 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 D instead.
D
= 13″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (7500 parts per
full reel).
2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc on
an Agilent/HP 4284A LCR meter or equivalent.
3. Peak primary current drawn at minimum input voltage.
4. Leakage inductance is for the primary winding with the secondary
windings shorted.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Specifications subject to change without notice.
US
+1-847-639-6400 sales@coilcraft.com
Please check
sales@coilcraft-europe.com
UK
+44-1236-730595
our website for latest information.
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 982F-2
Revised 12/05/12
© 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 982F-3
PFD3215 Coupled Inductors for Flyback, SEPIC and other applications
L vs Current
L vs Frequency
Typical Current Derating
120
110
100
Percent of rated
I
rms
90
80
70
60
50
40
30
20
10
0
-40
-20
0
20
40
60
80
100
120 140
Ambient temperature (°C)
25°C
Specifications subject to change without notice.
US
+1-847-639-6400 sales@coilcraft.com
Please check
sales@coilcraft-europe.com
UK
+44-1236-730595
our website for latest information.
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 982F-3
Revised 12/05/12
© 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.
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