Document 613-1

Hexa-Path Magnetics

HP1, HPH1

HP2, HPH2

HP3, HPH3• Six 1 : 1 isolated windings that can beconnected in series or parallel• Tightly coupled windings• 500 Vrms, one minute isolation
between each winding• Power range: 5 – 50 Watts as inductor
and flyback transformer; up to
150 Watts as forward transformer• Frequency range up to 1 MHz• UL1446 Class F (155°C) Insulation
System (UL File E83628)

These off-the shelf parts can be used
to create thousands of configurations,providing a convenient method fordesigners to create custom magnetics.
By connecting the windings in series
or parallel, the Hexa-Path components can be configured as inductors,
coupled inductors and transformers foruse in virtually any application: flyback,buck/boost, push-pull, forward, full andhalf bridge, Cuk, and SEPIC.

HP4, HPH4

HP5, HPH5

Winding Layouts

HP6, HPH6

Winding Layouts

HP1, HP2, HPH1, HPH2

HP3, HP4, HP5, HP6

HPH3, HPH4, HPH5, HPH6
Outer

Outer

6

7

5

8

6

7

9

5

8

11

8

4

9

10

7

6

3

3

10

5

2

2

11

2

11

4

1

1

12

1

12

12

One 6-filar winding

Inner

Two trifilar windings

Middle
4

9

3

10

Inner

Three bifilar windings

There are six different sizes available
with five HP parts and five HPH partsin each size. The HP offers lower DCR
and higher Irms ratings. The HPH
offers higher inductance and greater
energy storage capabilities.

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-1

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-2

Hexa-Path Magnetics
			PartInductance2
number1(µH)
HP1-1400L_
89.6 ±25%HP1-0190L_
12.2 ±20%HP1-0102L_
6.5 ±15%
HP1-0076L_
4.9 ±10%HP1-0059L_
3.8 ±5%HP2-1600L_
78.4 ±25%HP2-0216L_
10.6 ±20%HP2-0116L_
5.7 ±15%
HP2-0083L_
4.1 ±10%HP2-0066L_
3.2 ±5%HP3-0950L_
77.0 ±25%HP3-0138L_
11.2 ±20%HP3-0084L_
6.8 ±15%
HP3-0055L_
4.5 ±10%HP3-0047L_
3.8 ±5%HP4-1150L_
93.2 ±25%HP4-0140L_
11.3 ±20%HP4-0075L_
6.1 ±15%
HP4-0060L_
4.9 ±10%HP4-0047L_
3.8 ±5%HP5-1200L_
76.8 ±25%HP5-0155L_
9.9 ±20%
HP5-0083L_
5.3 ±15%HP5-0067L_
4.3 ±10%HP5-0053L_
3.4 ±5%HP6-2400L
86.4 ±25%HP6-0325L
11.7 ±20%HP6-0158L
5.69 ±15%HP6-0121L
4.36 ±10%HP6-0090L
3.24 ±5%
HPH1-1400L_ 202±25%
HPH1-0190L_ 27.4 ±20%
HPH1-0102L_ 14.7 ±15%
HPH1-0076L_ 10.9 ±10%
HPH1-0059L_
8.5 ±5%
HPH2-1600L_ 160±25%
HPH2-0216L_ 21.6 ±20%
HPH2-0116L_ 11.6 ±15%
HPH2-0083L_
8.3 ±10%
HPH2-0066L_
6.6 ±5%
HPH3-0950L_ 160±25%
HPH3-0138L_ 23.6 ±20%
HPH3-0084L_ 14.2 ±15%
HPH3-0055L_
9.3 ±10%
HPH3-0047L_
7.94 ±5%
HPH4-1150L_ 194±25%
HPH4-0140L_ 23.7 ±20%
HPH4-0075L_ 12.7 ±15%
HPH4-0060L_ 10.1 ±10%
HPH4-0047L_
7.94 ±5%
HPH5-1200L_ 173±25%
HPH5-0155L_ 22.3 ±20%
HPH5-0083L_ 12.0 ±15%
HPH5-0067L_
9.65 ±10%
HPH5-0053L_
7.63 ±5%
HPH6-2400L 194±25%
HPH6-0325L
26.3 ±20%
HPH6-0158L
12.8 ±15%
HPH6-0121L
9.8 ±10%
HPH6-0090L
7.29 ±5%

DCR
max3(Ohms)
0.145
0.145
0.145
0.145
0.145
0.085
0.085
0.085
0.085
0.085
0.055
0.055
0.055
0.055
0.055
0.055
0.055
0.055
0.055
0.055
0.045
0.045
0.045
0.045
0.045
0.020
0.020
0.020
0.020
0.020
0.340
0.340
0.340
0.340
0.340
0.155
0.155
0.155
0.155
0.155
0.125
0.125
0.125
0.125
0.125
0.078
0.078
0.078
0.078
0.078
0.070
0.070
0.070
0.070
0.070
0.030
0.030
0.030
0.030
0.030

Volt-time Peak energy
product4
storage5	 Isat6(V-µsec)
(µJ)
(A)
23.4
Note 8Note 8
23.4
29.8
0.440
23.4
55.1
0.820
23.4
74.7
1.10
23.4
93.8
1.40
30.8
Note 8Note 8
30.8
79.2
0.770
30.8
184
1.60
30.8
228
2.10
30.8
252
2.50
30.4
Note 8Note 8
30.4
59.6
0.650
30.4
111
1.14
30.4
156
1.66
30.4
173
1.90
47.3
Note 8Note 8
47.3
142
1.00
47.3
307
2.00
47.3
386
2.50
47.3
490
3.20
62.8
Note 8Note 8
62.8
281
1.50
62.8
562
2.90
62.8
626
3.40
62.8
946
4.70
87.9
Note 8Note 8
87.9
332
1.50
87.9
981
3.70
87.9
1485
5.20
87.9
1833
6.70
35.1
Note 8Note 8
35.1
31.1
0.300
35.1
60.2
0.570
35.1
99.2
0.850
35.1
107
1.00
44.0
Note 8Note 8
44.0
82.3
0.550
44.0
177
1.10
44.0
302
1.70
44.0
333
2.00
43.9
Note 8Note 8
43.9
52.5
0.420
43.9
98.0
0.740
43.9
169
1.20
43.9
196
1.40
68.3
Note 8Note 8
68.3
138
0.680
68.3
314
1.40
68.3
368
1.70
68.3
529
2.30
94.2
Note 8Note 8
94.2
248
0.940
94.2
546
1.90
94.2
700
2.40
94.2
809
2.90
131.9
Note 8Note 8
131.9
477
1.20
131.9
1176
2.70
131.9
1783
3.80
131.9
1944
4.60

Irms7
(A)
0.74
0.74
0.74
0.74
0.74
1.13
1.13
1.13
1.13
1.13
1.73
1.73
1.73
1.73
1.73
1.88
1.88
1.88
1.88
1.88
2.25
2.25
2.25
2.25
2.25
3.50
3.50
3.50
3.50
3.50
0.62
0.62
0.62
0.62
0.62
0.83
0.83
0.83
0.83
0.83
1.13
1.13
1.13
1.13
1.13
1.65
1.65
1.65
1.65
1.65
1.95
1.95
1.95
1.95
1.95
2.90
2.90
2.90
2.90
2.90

1. Please specify termination and packaging codes:
HPH1-1400LD
Termination: L = RoHS compliant tin-silver overtin 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: All but HP6 and HPH6:
D = 13″ machine-ready reel.
EIA-481 embossed plastic tape.
Quantities less than full reelavailable: in tape (not machine
ready) or with leader and trailer($25 charge).
B = Less than full reel. In an effort
to simplify our part numberingsystem, Coilcraft is eliminating
the need for multiple packaging
codes. When ordering, simply
change the last letter of yourpart number from B to D.
HP6 and HPH6: 24 per tray (no code)
2. Inductance is per winding, measured at 100 kHz,
0.1 Vrms, 0 Adc.
3. DCR is per winding, measured on Cambridge
Technology micro-ohmmeter or equivalent.
4. Volt-time product is for a single winding or multiple
windings connected in parallel. To calculate volttime product for windings connected in series, multiply the value specified in the table by the numberof windings connected in series.
5. Peak energy storage is for any combination of windings, assuming saturation current applied. See note
6 for definition of saturation current.
6. DC current at which the inductance drops 30% typfrom its value without current, based on current
applied to all six windings connected in series. For
applications where all windings are not connected
in series, use the following equation to calculate
Isat:
Isat = Isattable × 6 ÷ number of windings in series.
7. Current that causes a 40°C rise from 25°C ambientdue to self heating, tested with continuous current
flow through all windings connected in series.
Application temperature rise will depend on the operating current, duty cycle, and winding connection.
8. Part is designed exclusively for use as a forward
converter transformer and was not tested for energy
storage and saturation current.
9. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components”
before soldering

Core material Ferrite
Terminations RoHS tin-silver over tin over nickel
over phos bronze. Other terminations available atadditional cost.
Ambient temperature –40°C to +85°C with Irms
current.
Maximum part temperature +125°C
Storage temperature Component: –40°C to +125°C.
Packaging: –40°C to +80°C
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)
PCB washing Tested to MIL-STD-202 Method 215
plus an additional aqueous wash. See Doc787_
PCB_Washing.pdf.

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-2

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-3

Hexa-Path Magnetics
HP1, HPH1
Dot indicates pin 1

Internal code1

HP1-1234L

0.079
2,00

1

0.512 max
13,0

0.055
1,40

0.433
11,00
0.512max
13,00.004 / 0,10

Weight: 1.4 g
Packaging 500 per 13″ reel Plastic tape: 24 mm wide,
0.5 mm thick, 20 mm pocket spacing, 6.6 mm pocket depth

inchesmm

Dot indicates pin 1

Internal code1

HP2-1234L

0.098
2,50

0.098
2,50

12

XXXX CC-5Y

0.028
0,70

Recommended
Land Pattern

Parts manufactured prior to
February 2018 may be marked
differently.

0.244max
6,20

HP2, HPH2

12

0.079
2,00

0.362
9,20

Dimensions are in

0.394
10,00

12

XXXX CC-5Y

0.028
0,70

0.063
1,60

0.098
2,50

0.512
13,00
1

12

Recommended
Land Pattern

0.642 max
16,30
0.069
1,75

0.508
12,90
Parts manufactured prior to
February 2018 may be marked
differently.

0.291max
7,40
0.575
14,60
0.661max
16,80

Dimensions are in

inchesmm

0.004 / 0,10

Weight: 2.7 – 2.8 g
Packaging 400 per 13″ reel Plastic tape: 32 mm wide,
0.4 mm thick, 20 mm pocket spacing, 7.6 mm pocket depth

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-3

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-4

Hexa-Path Magnetics
HP3, HPH3
Dot indicates pin 1

Internal code

1

12

0.098
2,50

HP3-1234L

XXXX CC-5Y

0.028
0,70

0.135
3,43

0.665
16,88
1

0.098
2,50

0.677 max
17,20

12

Recommended
Land Pattern
0.069
1,75

Current production parts have ametal cover. Previous production
had a non-metal cover. Footprint
and land pattern are the same.
0.335max
8,51

Parts manufactured prior to
February 2018 may be marked
differently.
0.004 / 0,10

0.693
17,60
0.865 max
22,00

Dimensions are in

Weight: 4.2 – 4.6 g
Packaging 200 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth

inchesmm

HP4, HPH4
Dot indicates pin 1

Internal code1

HP4-1234L

0.100
2,54

0.100
2,54

12

XXXX CC-5Y

0.028
0,70

0.130
3,30

0.748
19,0
1

12

Recommended
Land Pattern

0.720 max
18,30

0.069
1,75

Current production parts have ametal cover. Previous production
had a non-metal cover. Footprint
and land pattern are the same.
0.382 max
9,70

Parts manufactured prior to
February 2018 may be marked
differently.
0.799
20.30
0.950 max
24,13

Dimensions are in

inchesmm

0.004 / 0,10

Weight: 6.8 – 7.5 g
Packaging 200 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 24 mm pocket spacing, 10.56 mm pocket depth

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-4

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-5

Hexa-Path Magnetics
HP5, HPH5
Dot indicates pin 1

Internal code

1

0.130
3,3
12

0.118
3,00

HP5-1234L

XXXX CC-5Y

0.028
0,70

0.930
23,62
1

0.118
3,00

12

Recommended
Land Pattern

0.810 max
20,57

0.069
1,75

Current production parts have ametal cover. Previous production
had a non-metal cover. Footprint
and land pattern are the same.
0.425 max
10,80

Parts manufactured prior to
February 2018 may be marked
differently.
0.004 / 0,10

0.969
24,6
1.148
max
29,15

Dimensions are in

Weight: 10.6 – 11.5 g
Packaging 175 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 28 mm pocket spacing, 12.0 mm pocket depth

inchesmm

HP6, HPH6
Dot indicates pin 1

Internal code
0.108
2,75

1

1.10
28,2

12

0.148
3,75

HP6-1234L

XXXX CC-5Y

0.039
1,00

1

0.148
3,75
1.053 max
26,75

12

Recommended
Land Pattern

0.079
2,00

Current production parts have ametal cover. Previous production
had a non-metal cover. Footprint
and land pattern are the same.
0.535 max
13,6

Parts manufactured prior to
February 2018 may be marked
differently.

1.173
29,80
1.285 max
32,65

Dimensions are in

0.004 / 0,10

Weight: 22.4 – 24.3 g
Packaging 24 per tray

inchesmm

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-5

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-6

Hexa-Path Magnetics

Formulas used to calculate electrical characteristics
Connecting windings in series

Inductance = Inductancetable × (number of windings)2
DCR = DCRtable × number of windings
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable

Connecting windings in parallel

Inductance = Inductancetable
DCR = 1 ÷ [number of windings × (1 ÷ DCRtable)]
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable × number of windings

Inductors – using multiple windings
			PartInductancenumber(µH)
HP3-0138L_
11.2 ±20%

DCR
max(Ohms)
0.055

Volt-time Peak energy
product
storageIsat(V-µsec)
(µJ)
(A)
30.4
1.656 0.650

Irms
(A)
1.73

Connecting windings in series
For higher inductance, the windings can be connected in series. As inductanceincreases, energy storage and Irms remain the same, but DCR increases andIsat decreases.
Example: Calculate new electricals for HP3-0138L with four windings (Wn)connected in series:
Inductance = Inductancetable × Wn2= 11.2 × 42 = 179.2 µH

1

4

12
2

9
5

11
3

8

10
6

DCR = DCRtable × Wn
= 0.055 × 4 = 0.22 Ohms
Isat = (Isattable) × 6 ÷ Wn
= (0.65 × 6) ÷ 4 = 0.975 A

7

L = 179.2 µH
DCR = 0.22
Isat = 0.975 A
Irms = 1.73 A

Irms = Irmstable = 1.73 A

Connecting windings in parallel

To increase current ratings, the windings (Wn) can be connected in parallel. DCR
decreases, current ratings increase, and inductance remains the same.
Example: Calculate new electricals for HP5-0083L, with three (Wn) windings
connected in parallel (equivalent to one winding in series):
Inductance = Inductancetable= 11.2 µH
DCR = 1 ÷ [Wn × (1 ÷ DCRtable)]= 1 ÷ [3 × (1 ÷ 0.045)] = 0.015 Ohms

4
1
2
3

9
5

10
11
12

8
6

7

Isat = (Isattable × 6) ÷ Wn
= (0.65 × 6) ÷ 1 = 3.9 A

L = 11.2 µH
DCR = 0.015
Isat = 3.9 A
Irms = 5.19 A

Irms = Irmstable × Wn
= 1.73 × 3 = 5.19 A
Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-6

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-7

Hexa-Path Magnetics

Formulas used to calculate electrical characteristics
Connecting windings in series

Inductance = Inductancetable × (number of windings)2
DCR = DCRtable × number of windings
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable

Connecting windings in parallel

Inductance = Inductancetable
DCR = 1 ÷ [number of windings × (1 ÷ DCRtable)]
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable × number of windings

Create a 13 Watt 2 : 1 : 1 flyback transformer with a bias winding
Choose HPH3-0138L

Vin = 36 – 57 Vdc; Vout = 12 V, 1.1 A
			PartInductancenumber(µH)
HPH3-0138L
23.6 ±20%

DCR
max(Ohms)
0.125

Volt-time Peak energy
product
storageIsat(V-µsec)
(µJ)
(A)
43.9
1.457 0.420

Irms
(A)
1.13

Connecting primary windings in series

When primary windings (Wpri) are connected in series, inductanceincreases, energy storage and Irms remain the same, but DCR increases
and Isat decreases.

1

4

12
2

9

Example: For HPH3-0138L, connect two primary windings in series:
Inductance = Inductancetable × Wpri2= 23.6 × 22 = 94.4 µH
DCR = DCRtable × Wpri
= 0.125 × 2 = 0.25 Ohms

Pri

11
3

Isat = (Isattable × 6) ÷ Wpri
= (0.42 × 6) ÷ 2 = 1.26 A

5
6

Sec
7
8

Bias

Irms = Irmstable = 1.13 A

10Connecting secondary windings in parallel

When secondary windings (Wsec) are connected in parallel, DCR decreases
and Irms increases.
Example: For HPH3-0083L, connect two secondary windings in parallel:

Primary:
L = 94.4 µH
DCR = 0.25
Isat = 1.26 A
Irms = 1.13 A

Secondary:
DCR = 0.0625
Irms = 2.26 A

DCR = 1 ÷ [Wsec × (1 ÷ DCRtable)]= 1 ÷ [(2 × (1 ÷ 0.125)] = 0.0625 Ohms
Irms = Irmstable × Wsec = 1.13 × 2 = 2.26 A

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-7

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-8

Hexa-Path Magnetics

Formulas used to calculate electrical characteristics
Connecting windings in series

Inductance = Inductancetable × (number of windings)2
DCR = DCRtable × number of windings
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable

Connecting windings in parallel

Inductance = Inductancetable
DCR = 1 ÷ [number of windings × (1 ÷ DCRtable)]
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable × number of windings

Create a 130 Watt, 1 : 1, two switch forward converter transformer
Choose HPH6-2400L

Vin = 36 – 57 Vdc; Vout = 12 V, 10.8 A
			PartInductancenumber(µH)
HPH6-2400L
194 ±25%

DCR
max(Ohms)
0.030

Volt-time Peak energy
product
storage(V-µsec)
(µJ)
131.9
N/A

Isat
(A)
N/A

Irms
(A)
2.90

Connecting primary windings in parallel

When primary windings (Wpri) are connected in parallel, DCR decreases,
Irms increases, and inductance and volt-time product remain the same.
Example: For HPH6-2400L, connect three primary windings in parallel:
Inductance = Inductancetable= 194 µH
DCR = 1 ÷ [Wpri × (1 ÷ DCRtable)]= 1 ÷ [(3 × (1 ÷ 0.030]) = 0.010 Ohms
VT

= VTtable= 131.9 V-µsec

1
2
3

4
5
6

Pri

Sec

10
11
12

7
8
9

Primary:
L = 194 µH
DCR = 0.01
Irms = 8.7 A
VT = 131.9 V-µsec

Secondary:
DCR = 0.01
Irms = 8.7 A

Irms = Irmstable × Wpri
= 2.90 × 3 = 8.70 A

Connecting secondary windings in parallel

When secondary windings (Wsec) are connected in parallel, DCR decreases and Irms increases.
Example: For HPH6-2400L, connect three secondary windings in parallel:
DCR = 1 ÷ [Wsec × (1 ÷ DCRtable)]= 1 ÷ [(3 × (1 ÷ 0.030)] = 0.010 Ohms
Irms = Irmstable × Wsec
= 2.90 × 3 = 8.70 A

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-8

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-9

Hexa-Path Magnetics

Formulas used to calculate electrical characteristics
Connecting windings in series

Inductance = Inductancetable × (number of windings)2
DCR = DCRtable × number of windings
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable

Connecting windings in parallel

Inductance = Inductancetable
DCR = 1 ÷ [number of windings × (1 ÷ DCRtable)]
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable × number of windings

Create a 100 Watt, 1 : 2, half bridge forward converter transformer with center tapped secondary
Choose HP6-2400L

Vin = 36 – 57 Vdc; Vout = 24 V, 4.2 A
			PartInductancenumber(µH)
HPH6-2400L
194 ±25%

DCR
max(Ohms)
0.030

Volt-time Peak energy
product
storage(V-µsec)
(µJ)
131.9
N/A

Isat
(A)
N/A

Irms
(A)
2.90

Connecting primary windings in parallel

3

When primary windings (Wpri) are connected in parallel, DCR decreases,
current ratings increase, and inductance and volt-time product remain the
same.

10
4
1
2

Example: For HPH-2400L, connect two primary windings in parallel:
Inductance = Inductancetable= 194 µH

VT

9
5

Pri

DCR = 1 ÷ [Wpri × (1 ÷ DCRtable)]= 1 ÷ [(2 × (1 ÷ 0.030)] = 0.015 Ohms

Sec A

11
12
8
6

= VTtable= 131.9 V-µsec

Irms = Irmstable × Wpri
= 2.90 × 2 = 5.8 A

Sec B

7

Connecting secondary windings in series

When secondary windings (Wsec) are connected in series, Irms remains
the same, but DCR increases.

Primary:
Each half secondary;
L = 194 µH
Sec A (3-9), Sec B (5-7):
DCR = 0.015
DCR = 0.06
Irms = 5.8 A
Irms = 2.9 A
VT = 131.9 V-µsec

Example: For HP6-2400L, connect four secondary windings in series,
creating a center tap at pins 9 and 5. For each half of the secondary:
DCR = DCRtable × Wsec
= 0.030 × 2 = 0.060 Ohms
Irms = Irmstable= 2.9 ASpecificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-9

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 613-10

Hexa-Path Magnetics

Formulas used to calculate electrical characteristics
Connecting windings in series

Inductance = Inductancetable × (number of windings)2
DCR = DCRtable × number of windings
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable

Connecting windings in parallel

Inductance = Inductancetable
DCR = 1 ÷ [number of windings × (1 ÷ DCRtable)]
Isat = (Isattable × 6) ÷ number of windings connected in series
Irms = Irmstable × number of windings

Create a 1 : 1 gate drive transformer
Choose HP1-1400L

			
Part
Inductancenumber(µH)
HP1-1400L
89.6 ±25%

DCR
max(Ohms)
0.130

Volt-time Peak energy
product
storage(V-µsec)
(µJ)
23.4
N/A

Isat
(A)
N/A

Irms
(A)
0.74

Connecting primary windings in series

When primary windings (Wpri) are connected in series, inductance andvolt-time product increase, energy storage and Irms remain the same,but DCR increases.
Example: For HPH1-1400L, connect three primary windings in series:
Inductance= Inductancetable × Wpri2= 89.6 × 32 = 806.4 µH

DCR = DCRtable × Wpri
= 0.130 × 3 = 0.39 Ohms
VT

= VTtable × Wpri
= 70.2 V-µsec

Irms = Irmstable= 0.74

Connecting secondary windings in series

4

10

1
5

7
11

Pri

Sec
2
6

8
12

3

9

Primary:
L = 806.4 µH
DCR = 0.39
Irms = 0.74 A
VT = 70.2 V-µsec

Secondary:
DCR = 0.39
Irms = 0.74 A

When secondary windings (Wsec) are connected in series, Irms remains
the same, but DCR increases.
Example: For HP1-1400L, connect three secondary windings in series:
DCR = DCRtable × Wsec
= 0.130 × 3 = 0.39 Ohms
Irms = Irmstable= 0.74

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check our
website for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
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 613-10

Revised 11/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.