Coupled Inductors
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Current flowing through a conductor generates a magnetic flux field. If the current varies over time, then so will the flux - and a current will flow in a second conductor if it is permeated by such a time varying magnetic field. This effect is known as inductance.
Coupled inductors comprise two coils of wire wrapped around a magnetic core. A varying magnetic field generated by current in the first coil will induce a current in the opposite direction in the second coil. The voltage across the second coil depends on the rate of change of current in the first, and the mutual inductance of the system.
Applications for coupled inductors
Purpose-designed coupled inductors are used in a variety of power conversion circuits such as flyback, SEPIC, Fly-Buck™, Cuk, ZETA and multi-phase topologies. These voltage regulation circuits use coupled inductors to efficiently provide the required output voltages, which may be stepped up or down from the input. To do this, SEPIC and Zeta circuits use 1:1 coupled inductors, whereas flyback and other circuits use 1:N inductors. In multi-phase power converters, coupled inductors provide inherent ripple current cancelling that is not provided by single inductors.
You can connect coupled inductor windings in different configurations to serve different purposes. The windings may be connected to circuits separately for use as isolation transformers or as common mode chokes. You may also connect them in series to achieve a higher inductance or for use as a tapped inductor.
How do I choose a coupled inductor?
Selection of a coupled inductor is application dependent. Coilcraft, for example, publishes datasheets that characterize coupled inductors for multiple circuit uses, and the company has developed online tools for selecting coupled inductors. Their MAGPro™ Coupled Inductor Finder is a powerful search and analysis tool that finds off-the-shelf coupled inductors for SEPIC and Zeta converters and many other applications.
Manufacturer Part No | Order Code | Description / Manufacturer | Availability | Price For |
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Quantity | Product Range | Inductance, Parallel | RMS Current, Parallel | Saturation Current, Parallel | DC Resistance Max, Parallel | Leakage Inductance | Turns Ratio | Product Length | Product Width | Product Height | Inductor Mounting | Operating Temperature Min | Operating Temperature Max | Qualification | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5010-103MRB
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2434726 |
Inductor, Coupled, 10 µH, 20%, 0.39 ohm, 500 mA, 4.8mm x 4.8mm x 0.9mm COILCRAFT
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LPD5010 | 10µH | 500mA | 670mA | 0.39ohm | 270nH | 1:1 | 4.8mm | 4.8mm | 0.9mm | Surface Mount | -40°C | 85°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CTX10-4-R
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1463539 |
Inductor, 9.6 µH, 20%, 0.019 ohm, 3.4 A, 11.43mm x 11.43mm x 6.35mm EATON COILTRONICS
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OCTA-PAC | 9.6µH | 3.4A | - | 0.019ohm | - | 1:1 | 11.43mm | 11.43mm | 6.35mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
DRQ127-330-R
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1612156 |
Inductor, Power, 33.92 µH, 0.06 ohm, 3.23 A, 12.5mm x 12.5mm x 8mm EATON COILTRONICS
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DRQ | 33.92µH | 3.23A | 6.22A | 0.06ohm | - | 1:1 | 12.5mm | 12.5mm | 8mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
LPD5030-104MRC
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2434747 |
Inductor, Coupled, 100 µH, 20%, 0.895 ohm, 330 mA, 4.8mm x 4.8mm x 2.9mm COILCRAFT
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LPD5030 | 100µH | 330mA | 470mA | 0.895ohm | 370nH | 1:1 | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
744877100
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1869664 |
Inductor, DD 7345, 10 µH, 20%, 0.12 ohm, 1.1 A, 7.3mm x 7.3mm x 4.8mm WURTH ELEKTRONIK
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WE-DD | 10µH | 1.1A | 2.8A | 0.12ohm | - | 1:1 | 7.3mm | 7.3mm | 4.8mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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744870220
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1869686 |
Inductor, DD 1280, 22 µH, 20%, 0.08 ohm, 2.45 A, 12.5mm x 12.5mm x 8.5mm WURTH ELEKTRONIK
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WE-DD | 22µH | 2.45A | 5.2A | 0.08ohm | - | 1:1 | 12.5mm | 12.5mm | 8.5mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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IHCL4040DZER220M5A
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2429152 |
Inductor, Coupled, 22 µH, 20%, 0.19 ohm, 2.6 A, 10.67mm x 10.16mm x 4mm, IHCL-4040DZ-5A Series VISHAY
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IHCL-4040DZ-5A | 22µH | 2.6A | 4.75A | 0.19ohm | - | 1:1 | 10.67mm | 10.16mm | 4mm | Surface Mount | -55°C | 155°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF0703A-220M
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2454998 |
Inductor, Coupled, 22 µH, 20%, 0.15 ohm, 1.62 A, 7.6mm x 7.6mm x 3.4mm BOURNS
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SRF0703A | 22µH | 1.62A | 1.67A | 0.15ohm | - | 1:1 | 7.6mm | 7.6mm | 3.4mm | Surface Mount | -40°C | 125°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD6235-155MRC
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2434761 |
Inductor, Coupled, 1.5 mH, 20%, 5.4 ohm, 140 mA, 6mm x 6mm x 3.5mm COILCRAFT
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LPD6235 | 1.5mH | 140mA | 120mA | 5.4ohm | 1.7µH | 1:1 | 6mm | 6mm | 3.5mm | Surface Mount | -40°C | 125°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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744877101
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1869666 |
Inductor, DD 7345, 100 µH, 20%, 1.3 ohm, 650 mA, 7.3mm x 7.3mm x 4.8mm WURTH ELEKTRONIK
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WE-DD | 100µH | 650mA | 900mA | 1.3ohm | - | 1:1 | 7.3mm | 7.3mm | 4.8mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF0703A-680M
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2455001 |
Inductor, Coupled, 68 µH, 20%, 0.507 ohm, 890 mA, 7.6mm x 7.6mm x 3.4mm BOURNS
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SRF0703A | 68µH | 890mA | 960mA | 0.507ohm | - | 1:1 | 7.6mm | 7.6mm | 3.4mm | Surface Mount | -40°C | 125°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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HM78D-755102MLFTR
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2192105 |
Inductor, 1 mH, +/-20%, 270 mA, 7.7mm x 7.7mm x 4.8mm TT ELECTRONICS / BI TECHNOLOGIES
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HM78D | 1mH | 270mA | 310mA | - | - | 1:1 | 7.7mm | 7.7mm | 4.8mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MSD1278-224KLD
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2288082 |
Inductor, Power, 220 µH, 10%, 0.345 ohm, 740 mA, 12.3mm x 12.3mm x 8.05mm COILCRAFT
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MSD1278 | 220µH | 740mA | 2.3A | 0.345ohm | 1.54µH | 1:1 | 12.3mm | 12.3mm | 8.05mm | Surface Mount | -40°C | 85°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF1280A-330M
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2455027 |
Inductor, Coupled, 33 µH, 20%, 0.0664 ohm, 3.23 A, 12.5mm x 12.5mm x 8mm BOURNS
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SRF1280A | 33µH | 3.23A | 6.22A | 0.0664ohm | - | 1:1 | 12.5mm | 12.5mm | 8mm | Surface Mount | -40°C | 125°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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HA78D-L128100MLFTR
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2820204 |
Inductor, 10 µH, 20%, 0.029 ohm, 12.5mm x 12.5mm x 8.05mm TT ELECTRONICS / BI TECHNOLOGIES
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HA78D | 10µH | - | 10.66A | 0.029ohm | - | 1:1 | 12.5mm | 12.5mm | 8.05mm | Surface Mount | -50°C | 155°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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7448990150
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2842135 |
Inductor, Coupled, Molded, 15 µH, 0.087 ohm, 3.9 A, 11.5mm x 10mm x 9mm WURTH ELEKTRONIK
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WE-MCRI | 15µH | 3.9A | 9.5A | 0.087ohm | 300nH | 1:1 | 11.5mm | 10mm | 9mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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74485540440
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2336089 |
Inductor, Coupled, 4.4 µH, 20%, 9600 µohm, 12 A, 13.2mm x 13.2mm x 10.5mm WURTH ELEKTRONIK
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WE-CFWI | 4.4µH | 12A | 24A | 0.0096ohm | - | 1:1 | 13.2mm | 13.2mm | 10.5mm | Surface Mount | -40°C | 150°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD3015-223MRC
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2407931RL |
Inductor, Coupled, 22 µH, 20%, 1.89 ohm, 400 mA, 3mm x 3mm x 1.4mm COILCRAFT
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- | - | - | - | - | 480nH | 1:1 | - | - | - | Surface Mount | -40°C | 85°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SLC7530D-640MLC
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2288956 |
Inductor, Power, 64 nH, 20%, 0.209 ohm, 38 A, 7.5mm x 6.7mm x 3mm COILCRAFT
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SLC7530 | 64nH | 38A | 32A | 0.209ohm | - | 1:1 | 7.5mm | 6.7mm | 3mm | Surface Mount | -40°C | 85°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5010-103MRB
![]() |
2434726RL |
Inductor, Coupled, 10 µH, 20%, 0.39 ohm, 500 mA, 4.8mm x 4.8mm x 0.9mm COILCRAFT
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- | - | - | - | - | 270nH | 1:1 | - | - | - | Surface Mount | -40°C | 85°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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HA78D-1284R7MLFTR
![]() |
2820203 |
Inductor, 4.7 µH, 20%, 0.019 ohm, 7.4 A, 12.5mm x 12.5mm x 8.05mm TT ELECTRONICS / BI TECHNOLOGIES
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HA78D | 4.7µH | 7.4A | 14.9A | 0.019ohm | - | 1:1 | 12.5mm | 12.5mm | 8.05mm | Surface Mount | -50°C | 155°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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7448991068
![]() |
3221547 |
COUPLED INDUCTOR, 6.8UH, 5A WURTH ELEKTRONIK
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WE-MCRI | 6.8µH | 5A | 12A | 0.044ohm | 240nH | 1:1 | 11mm | 10mm | 4mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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74485540101
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3517116 |
COUPLED INDUCTOR, 10UH, 13A, 0.0139 OHM WURTH ELEKTRONIK
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WE-CFWI | 10µH | 13A | 13.5A | 0.0139ohm | - | 1:1 | 15.5mm | 13.2mm | 12.5mm | Surface Mount | -40°C | 150°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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IHCL4040DZER2R2M5A
![]() |
2429147 |
Inductor, Coupled, 2.2 µH, 20%, 0.015 ohm, 9 A, 10.67mm x 10.16mm x 4mm VISHAY
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IHCL-4040DZ-5A | 2.2µH | 9A | 14A | 0.015ohm | - | 1:1 | 10.67mm | 10.16mm | 4mm | Surface Mount | -55°C | 155°C | AEC-Q200 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF1280-821M
![]() |
1852883 |
Inductor, Power, Dual, 820 µH, 1.632 ohm, 650 mA, 12.5mm x 12.5mm x 8mm BOURNS
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SRF1280 | 820µH | 650mA | 1.27A | 1.632ohm | - | 1:1 | 12.5mm | 12.5mm | 8mm | Surface Mount | -40°C | 125°C | - |