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 | Product Length | Product Width | Product Height | Inductor Mounting | Operating Temperature Min | Operating Temperature Max | Qualification | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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74488540070
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2249879 |
Inductor, Energy Harvesting, 7.5 µH, 0.095 ohm, 1.9 A, 6mm x 6mm x 4mm WURTH ELEKTRONIK
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WE-EHPI | 7.5µH | 1.9A | 1.3A | 0.095ohm | - | 6mm | 6mm | 4mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
LPR6235-752SMRB
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2434775 |
Inductor, Coupled, 7.5 µH, 316 ohm, 6mm x 6mm x 3.5mm COILCRAFT
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LPR6235 | 7.5µH | - | 1.6A | 316ohm | - | 6mm | 6mm | 3.5mm | Surface Mount | -40°C | 85°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
LPR4012-202LMLB
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2361074 |
Inductor, Coupled, 2 µH, 0.24 ohm, 1.73 A, 3.94mm x 3.94mm x 1.1mm COILCRAFT
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LPR4012 | 2µH | 1.73A | 1.73A | 0.24ohm | - | 3.94mm | 3.94mm | 1.1mm | Surface Mount | -40°C | 85°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
74488540120
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2249880 |
Inductor, Energy Harvesting, 13 µH, 0.1 ohm, 1.7 A, 6mm x 6mm x 4mm WURTH ELEKTRONIK
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WE-EHPI | 13µH | 1.7A | 1A | 0.1ohm | - | 6mm | 6mm | 4mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
SRF0703-4R7M
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1852815 |
Inductor, Power, Dual, 4.7 µH, 0.0406 ohm, 3.09 A, 7.6mm x 7.6mm x 3.4mm BOURNS
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SRF0703 | 4.7µH | 3.09A | 3.78A | 0.0406ohm | - | 7.6mm | 7.6mm | 3.4mm | Surface Mount | -40°C | 125°C | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5030-473MRC
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2434745 |
Inductor, Coupled, 47 µH, 20%, 0.403 ohm, 500 mA, 4.8mm x 4.8mm x 2.9mm COILCRAFT
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LPD5030 | 47µH | 500mA | 590mA | 0.403ohm | 240nH | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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74488540250
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2249882 |
Inductor, Energy Harvesting, 25 µH, 0.24 ohm, 1.5 A, 6mm x 6mm x 4mm WURTH ELEKTRONIK
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WE-EHPI | 25µH | 1.5A | 700mA | 0.24ohm | - | 6mm | 6mm | 4mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF1260-220M
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1852846 |
Inductor, Power, Dual, 22 µH, 0.0451 ohm, 3.7 A, 12.5mm x 12.5mm x 6mm BOURNS
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SRF1260 | 22µH | 3.7A | 4.71A | 0.0451ohm | - | 12.5mm | 12.5mm | 6mm | Surface Mount | -40°C | 105°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5030-682MRB
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2434740 |
Inductor, Coupled, 6.8 µH, 20%, 0.0795 ohm, 1.2 A, 4.8mm x 4.8mm x 2.9mm COILCRAFT
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LPD5030 | 6.8µH | 1.2A | 1.4A | 0.0795ohm | 120nH | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SDQ25-100-R
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1195550 |
POWER INDUCTOR, 10UH, 1.53A, 20% EATON ELECTRONICS
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SDQ25 Series | 9.8µH | 1.53A | 1.29A | 0.1068ohm | - | 5.2mm | 5.2mm | 2.5mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MSD1278-154KLD
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2288080 |
Inductor, Power, 150 µH, 10%, 0.23 ohm, 910 mA, 12.3mm x 12.3mm x 8.05mm COILCRAFT
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MSD1278 | 150µH | 910mA | 2.8A | 0.23ohm | 1.46µH | 12.3mm | 12.3mm | 8.05mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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IHCL4040DZER150M5A
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2429151 |
Inductor, Coupled, 15 µH, 20%, 0.1186 ohm, 3.5 A, 10.67mm x 10.16mm x 4mm VISHAY
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IHCL-4040DZ-5A | 15µH | 3.5A | 6A | 0.1186ohm | - | 10.67mm | 10.16mm | 4mm | Surface Mount | -55°C | 155°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPR6235-253LMRB
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2434771 |
Inductor, Coupled, 25 µH, 13.7 ohm, 6mm x 6mm x 3.5mm COILCRAFT
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LPR6235 | 25µH | - | 1.3A | 13.7ohm | - | 6mm | 6mm | 3.5mm | Surface Mount | -40°C | 85°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD6235-223MRC
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2434757 |
Inductor, Coupled, 22 µH, 20%, 0.15 ohm, 850 mA, 6mm x 6mm x 3.5mm COILCRAFT
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LPD6235 | 22µH | 850mA | 1.5A | 0.15ohm | 150nH | 6mm | 6mm | 3.5mm | Surface Mount | -40°C | 125°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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IHCL4040DZER4R7M5A
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2429149 |
Inductor, Coupled, 4.7 µH, 20%, 0.0287 ohm, 6.5 A, 10.67mm x 10.16mm x 4mm VISHAY
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IHCL-4040DZ-5A | 4.7µH | 6.5A | 11.5A | 0.0287ohm | - | 10.67mm | 10.16mm | 4mm | Surface Mount | -55°C | 155°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF0703-220M
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1852820 |
Inductor, Power, Dual, 22 µH, 0.15 ohm, 1.62 A, 7.6mm x 7.6mm x 3.4mm BOURNS
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SRF0703 | 22µH | 1.62A | 1.67A | 0.15ohm | - | 7.6mm | 7.6mm | 3.4mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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SRF1260A-1R5Y
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2374058 |
Inductor, Power, Dual, 1.5 µH, 7.3 µohm, 13.8 A, 12.5mm x 12.5mm x 6mm BOURNS
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SRF1260A | 1.5µH | 13.8A | 18.3A | 7.3µohm | - | 12.5mm | 12.5mm | 6mm | Surface Mount | -40°C | 125°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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 | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MSD1260-103MLD
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2288031 |
Inductor, Power, 10 µH, 20%, 0.03 ohm, 2.45 A, 12.3mm x 12.3mm x 6mm COILCRAFT
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MSD1260 | 10µH | 2.45A | 7.4A | 0.03ohm | 260nH | 12.3mm | 12.3mm | 6mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5030-153MRC
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2287516RL |
Inductor, Power, 15 µH, 20%, 0.149 ohm, 850 mA, 4.8mm x 4.8mm x 2.9mm COILCRAFT
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LPD5030 | 15µH | 850mA | 1A | 0.149ohm | 150nH | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MSD7342-472MLC
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2288160 |
Inductor, Power, 4.7 µH, 20%, 0.0255 ohm, 1.74 A, 7.5mm x 7.5mm x 4.6mm COILCRAFT
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MSD7342 | 4.7µH | 1.74A | 4.1A | 0.0255ohm | 110nH | 7.5mm | 7.5mm | 4.6mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MSD7342-224MLC
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2288182 |
Inductor, Power, 220 µH, 20%, 0.86 ohm, 300 mA, 7.5mm x 7.5mm x 4.6mm COILCRAFT
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MSD7342 | 220µH | 300mA | 590mA | 0.86ohm | 1.43µH | 7.5mm | 7.5mm | 4.6mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5030-153MRC
![]() |
2287516 |
Inductor, Power, 15 µH, 20%, 0.149 ohm, 850 mA, 4.8mm x 4.8mm x 2.9mm COILCRAFT
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LPD5030 | 15µH | 850mA | 1A | 0.149ohm | 150nH | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | AEC-Q200 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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744870220
![]() |
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 | - | 12.5mm | 12.5mm | 8.5mm | Surface Mount | -40°C | 125°C | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LPD5030V-154MRC
![]() |
2434715 |
Inductor, Coupled, 150 µH, 20%, 1.91 ohm, 180 mA, 4.8mm x 4.8mm x 2.9mm COILCRAFT
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LPD5030V | 150µH | 180mA | 250mA | 1.91ohm | 456nH | 4.8mm | 4.8mm | 2.9mm | Surface Mount | -40°C | 85°C | - |