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Our wide range of coupled inductors has a choice of inductance values from 50nH to 2mH – and RMS current ratings from 100mA to 38A.

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.

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Manufacturer Part No	Order Code	Description / Manufacturer	Price For	Price	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	2434726 Data Sheet + RoHS	Inductor, Coupled, 10 µH, 20%, 0.39 ohm, 500 mA, 4.8mm x 4.8mm x 0.9mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2434726 2434726RL in Re-reel	1+ £1.69 50+ £1.52 100+ £1.18 250+ £1.12 500+ £1.06 1000+ £0.976 5000+ £0.956 10000+ £0.937 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	LPD5010	10µH	500mA	670mA	0.39ohm	270nH	1:1	4.8mm	4.8mm	0.9mm	Surface Mount	-40°C	85°C	-
CTX10-4-R	1463539 Data Sheet + RoHS	Inductor, 9.6 µH, 20%, 0.019 ohm, 3.4 A, 11.43mm x 11.43mm x 6.35mm EATON COILTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:1463539 1463539RL in Re-reel	1+ £3.39 10+ £2.40 50+ £2.39 100+ £2.38 200+ £2.33 600+ £2.28 3000+ £2.24 6000+ £2.19 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	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	1612156 Data Sheet + RoHS	Inductor, Power, 33.92 µH, 0.06 ohm, 3.23 A, 12.5mm x 12.5mm x 8mm EATON COILTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:1612156 1612156RL in Re-reel	1+ £1.76 10+ £1.24 50+ £1.12 100+ £0.999 200+ £0.972 350+ £0.945 1750+ £0.926 3500+ £0.907 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	DRQ	33.92µH	3.23A	6.22A	0.06ohm	-	1:1	12.5mm	12.5mm	8mm	Surface Mount	-40°C	125°C	-
744877100	1869664 Data Sheet + RoHS Date/Lot Code	Inductor, DD 7345, 10 µH, 20%, 0.12 ohm, 1.1 A, 7.3mm x 7.3mm x 4.8mm WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:1869664 1869664RL in Re-reel	1+ £1.69 50+ £1.59 100+ £1.48 250+ £1.46 500+ £1.36 1000+ £1.17 5000+ £1.15 10000+ £1.12 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-DD	10µH	1.1A	2.8A	0.12ohm	-	1:1	7.3mm	7.3mm	4.8mm	Surface Mount	-40°C	125°C	-
LPD5030-104MRC	2434747 Data Sheet + RoHS	Inductor, Coupled, 100 µH, 20%, 0.895 ohm, 330 mA, 4.8mm x 4.8mm x 2.9mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2434747 2434747RL in Re-reel	1+ £1.49 10+ £1.34 50+ £1.19 200+ £1.04 400+ £0.727 750+ £0.673 3750+ £0.66 7500+ £0.646 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	LPD5030	100µH	330mA	470mA	0.895ohm	370nH	1:1	4.8mm	4.8mm	2.9mm	Surface Mount	-40°C	85°C	AEC-Q200

SRF0703A-680M	2455001 Data Sheet Data Sheet + RoHS Date/Lot Code	Inductor, Coupled, 68 µH, 20%, 0.507 ohm, 890 mA, 7.6mm x 7.6mm x 3.4mm BOURNS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2455001 2455001RL in Re-reel	1+ £0.563 50+ £0.493 100+ £0.408 250+ £0.366 500+ £0.338 1500+ £0.315 7500+ £0.304 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SRF0703A	68µH	890mA	960mA	0.507ohm	-	1:1	7.6mm	7.6mm	3.4mm	Surface Mount	-40°C	125°C	AEC-Q200

SRF0703A-220M	2454998 Data Sheet Data Sheet + RoHS	Inductor, Coupled, 22 µH, 20%, 0.15 ohm, 1.62 A, 7.6mm x 7.6mm x 3.4mm BOURNS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2454998 2454998RL in Re-reel	1+ £0.534 50+ £0.472 100+ £0.41 250+ £0.371 500+ £0.331 1500+ £0.317 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SRF0703A	22µH	1.62A	1.67A	0.15ohm	-	1:1	7.6mm	7.6mm	3.4mm	Surface Mount	-40°C	125°C	AEC-Q200

LPD6235-155MRC	2434761 Data Sheet + RoHS	Inductor, Coupled, 1.5 mH, 20%, 5.4 ohm, 140 mA, 6mm x 6mm x 3.5mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2434761 2434761RL in Re-reel	1+ £1.13 10+ £1.09 50+ £0.965 100+ £0.84 200+ £0.714 350+ £0.589 1750+ £0.548 3500+ £0.537 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	LPD6235	1.5mH	140mA	120mA	5.4ohm	1.7µH	1:1	6mm	6mm	3.5mm	Surface Mount	-40°C	125°C	AEC-Q200

744877101	1869666 Data Sheet + RoHS Date/Lot Code	Inductor, DD 7345, 100 µH, 20%, 1.3 ohm, 650 mA, 7.3mm x 7.3mm x 4.8mm WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:1869666 1869666RL in Re-reel	1+ £1.74 50+ £1.62 100+ £1.49 250+ £1.43 500+ £1.37 1000+ £1.17 5000+ £1.15 10000+ £1.12 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-DD	100µH	650mA	900mA	1.3ohm	-	1:1	7.3mm	7.3mm	4.8mm	Surface Mount	-40°C	125°C	-

744870220	1869686 Data Sheet + RoHS Date/Lot Code	Inductor, DD 1280, 22 µH, 20%, 0.08 ohm, 2.45 A, 12.5mm x 12.5mm x 8.5mm WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:1869686 1869686RL in Re-reel	1+ £2.15 10+ £2.04 50+ £1.91 100+ £1.76 200+ £1.60 500+ £1.39 2500+ £1.36 5000+ £1.33 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-DD	22µH	2.45A	5.2A	0.08ohm	-	1:1	12.5mm	12.5mm	8.5mm	Surface Mount	-40°C	125°C	-

IHCL4040DZER220M5A	2429152 Data Sheet + RoHS Date/Lot Code	Inductor, Coupled, 22 µH, 20%, 0.19 ohm, 2.6 A, 10.67mm x 10.16mm x 4mm, IHCL-4040DZ-5A Series VISHAY You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2429152 2429152RL in Re-reel	1+ £1.84 10+ £1.29 50+ £1.17 100+ £1.04 200+ £0.958 500+ £0.875 2500+ £0.86 5000+ £0.851 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	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

MSD1278-224KLD	2288082 Data Sheet + RoHS	Inductor, Power, 220 µH, 10%, 0.345 ohm, 740 mA, 12.3mm x 12.3mm x 8.05mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2288082 2288082RL in Re-reel 2297155 in Full Reel	1+ £2.26 10+ £2.09 50+ £1.93 100+ £1.76 200+ £1.59	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	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

HM78D-755102MLFTR	2192105 Data Sheet + RoHS	Inductor, 1 mH, +/-20%, 270 mA, 7.7mm x 7.7mm x 4.8mm TT ELECTRONICS / BI TECHNOLOGIES You previously purchased this product. View in Order History	Each	1+ £0.439	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	HM78D	1mH	270mA	310mA	-	-	1:1	7.7mm	7.7mm	4.8mm	Surface Mount	-40°C	125°C	-

SRF1280A-330M	2455027 Data Sheet Data Sheet + RoHS Date/Lot Code	Inductor, Coupled, 33 µH, 20%, 0.0664 ohm, 3.23 A, 12.5mm x 12.5mm x 8mm BOURNS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2455027 2455027RL in Re-reel	1+ £1.34 10+ £0.952 50+ £0.861 100+ £0.77 200+ £0.743 400+ £0.715 2000+ £0.702 4000+ £0.688 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SRF1280A	33µH	3.23A	6.22A	0.0664ohm	-	1:1	12.5mm	12.5mm	8mm	Surface Mount	-40°C	125°C	AEC-Q200

7448990150	2842135 Data Sheet + RoHS Date/Lot Code	Inductor, Coupled, Molded, 15 µH, 0.087 ohm, 3.9 A, 11.5mm x 10mm x 9mm WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each	1+ £2.23 10+ £1.96	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-MCRI	15µH	3.9A	9.5A	0.087ohm	300nH	1:1	11.5mm	10mm	9mm	Surface Mount	-40°C	125°C	-

HA78D-L128100MLFTR	2820204 Data Sheet + RoHS	Inductor, 10 µH, 20%, 0.029 ohm, 12.5mm x 12.5mm x 8.05mm TT ELECTRONICS / BI TECHNOLOGIES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2820204 2820204RL in Re-reel	1+ £0.645	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	HA78D	10µH	-	10.66A	0.029ohm	-	1:1	12.5mm	12.5mm	8.05mm	Surface Mount	-50°C	155°C	AEC-Q200

LPD5010-103MRB	2434726RL Data Sheet + RoHS	Inductor, Coupled, 10 µH, 20%, 0.39 ohm, 500 mA, 4.8mm x 4.8mm x 0.9mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2434726RL 2434726 in Cut Tape A £3.50 re-reeling charge will be added for this product	100+ £1.18 250+ £1.12 500+ £1.06 1000+ £0.976 5000+ £0.956 10000+ £0.937 More Pricing...	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	-	270nH	1:1	-	-	-	Surface Mount	-40°C	85°C	-

LPD3015-223MRC	2407931RL Data Sheet + RoHS	Inductor, Coupled, 22 µH, 20%, 1.89 ohm, 400 mA, 3mm x 3mm x 1.4mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2407931RL 2407931 in Cut Tape A £3.50 re-reeling charge will be added for this product	100+ £0.883 250+ £0.774 500+ £0.591 1000+ £0.502 5000+ £0.492 10000+ £0.482 More Pricing...	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	-	480nH	1:1	-	-	-	Surface Mount	-40°C	85°C	-

74485540440	2336089 Data Sheet + RoHS Date/Lot Code	Inductor, Coupled, 4.4 µH, 20%, 9600 µohm, 12 A, 13.2mm x 13.2mm x 10.5mm WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2336089 2336089RL in Re-reel	1+ £4.46 10+ £4.40 25+ £3.95 50+ £3.50 100+ £3.34 300+ £3.04 1500+ £2.98 3000+ £2.92 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-CFWI	4.4µH	12A	24A	0.0096ohm	-	1:1	13.2mm	13.2mm	10.5mm	Surface Mount	-40°C	150°C	-

SLC7530D-640MLC	2288956 Data Sheet + RoHS	Inductor, Power, 64 nH, 20%, 0.209 ohm, 38 A, 7.5mm x 6.7mm x 3mm COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2288956 2288956RL in Re-reel	1+ £1.42 10+ £1.32 50+ £1.21 100+ £1.11 200+ £1.00 500+ £0.648 2500+ £0.635 5000+ £0.622 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SLC7530	64nH	38A	32A	0.209ohm	-	1:1	7.5mm	6.7mm	3mm	Surface Mount	-40°C	85°C	AEC-Q200

HA78D-1284R7MLFTR	2820203 Data Sheet + RoHS	Inductor, 4.7 µH, 20%, 0.019 ohm, 7.4 A, 12.5mm x 12.5mm x 8.05mm TT ELECTRONICS / BI TECHNOLOGIES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2820203 2820203RL in Re-reel	1+ £0.645	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	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

7448991068	3221547 Data Sheet + RoHS	COUPLED INDUCTOR, 6.8UH, 5A WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each	1+ £1.76 10+ £1.52	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-MCRI	6.8µH	5A	12A	0.044ohm	240nH	1:1	11mm	10mm	4mm	Surface Mount	-40°C	125°C	-

74485540101	3517116 Data Sheet + RoHS Date/Lot Code	COUPLED INDUCTOR, 10UH, 13A, 0.0139 OHM WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:3517116 3517116RL in Re-reel	1+ £3.52 5+ £3.39 10+ £3.25 25+ £3.20 50+ £2.45 200+ £2.44 1000+ £2.39 2000+ £2.34 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	WE-CFWI	10µH	13A	13.5A	0.0139ohm	-	1:1	15.5mm	13.2mm	12.5mm	Surface Mount	-40°C	150°C	-

SRF0703-150M	1852819 Data Sheet + RoHS Date/Lot Code	Inductor, Power, Dual, 15 µH, 0.119 ohm, 1.83 A, 7.6mm x 7.6mm x 3.4mm BOURNS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:1852819 1852819RL in Re-reel	1+ £0.496 50+ £0.438 100+ £0.38 250+ £0.347 500+ £0.313 1500+ £0.296 7500+ £0.284 15000+ £0.28 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SRF0703	15µH	1.83A	2.05A	0.119ohm	-	1:1	7.6mm	7.6mm	3.4mm	Surface Mount	-40°C	125°C	-

744877100	1869664RL Data Sheet + RoHS Date/Lot Code	Inductor, DD 7345, 10 µH, 20%, 0.12 ohm, 1.1 A, 7.3mm x 7.3mm x 4.8mm WURTH ELEKTRONIK You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:1869664RL 1869664 in Cut Tape A £3.50 re-reeling charge will be added for this product	100+ £1.48 250+ £1.46 500+ £1.36 1000+ £1.17 5000+ £1.15 10000+ £1.12 More Pricing...	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	-	-	1:1	-	-	-	Surface Mount	-40°C	125°C	-