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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	Newark Part No.	Description / Manufacturer	Price for:	Price	Quantity	Product Range	Inductance, Parallel	RMS Current, Parallel	Saturation Current, Parallel	Coupled Inductor Case	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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HM78D-7556R8MLFTR	85W3286 Data Sheet + RoHS	Inductor, 6.8 µH, 20%, 2.6 A, 7.7mm x 7.7mm x 4.8mm TT ELECTRONICS / BI TECHNOLOGIES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape)	250+ $0.912	Restricted Item Minimum order of 1000 items Multiples of 1000 only Please enter a valid quantity Add Min: 1000 Mult: 1000	HM78D Series	6.8µH	2.6A	3.67A	-	-	-	7.7mm	7.7mm	4.8mm	Surface Mount	-40°C	125°C	-
CTX100-4A-R	27K6956 Data Sheet + RoHS Date/Lot Code	Inductor, Power, 100.57 µH, 25%, 0.235 ohm, 1.37 A, 11.43mm x 11.43mm x 6.35mm EATON ELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape)	1+ $2.02 10+ $2.02 25+ $2.02 50+ $2.02 100+ $2.02 250+ $2.02 500+ $2.02 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 PLUS CTX 4A Series	100.57µH	1.37A	1.32A	-	0.235ohm	-	11.43mm	11.43mm	6.35mm	Surface Mount	-40°C	125°C	-
CTX100-4A-R	54K4293 Data Sheet + RoHS Date/Lot Code	Inductor, Power, 100.57 µH, 25%, 0.235 ohm, 1.37 A, 11.43mm x 11.43mm x 6.35mm EATON ELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Full Reel)	1+ $2.14 2000+ $2.14 4000+ $2.14 8000+ $2.14 12000+ $2.14 20000+ $2.14 More Pricing...	Restricted Item Minimum order of 600 items Multiples of 600 only Please enter a valid quantity Add Min: 600 Mult: 600	OCTA-PAC PLUS CTX 4A Series	100.57µH	1.37A	1.32A	-	0.235ohm	-	11.43mm	11.43mm	6.35mm	Surface Mount	-40°C	125°C	-
LPD5030-472MRB	79X5700 Data Sheet Data Sheet + RoHS Date/Lot Code	COUPLED INDUCTOR, 4.7UH, 1.4A, 20% COILCRAFT You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Delivery in 2-4 business days from our UK warehouse for in stock items	1+ $1.60 10+ $1.34 25+ $1.31 50+ $1.29 100+ $1.18	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	LPD5030	4.7µH	1.4A	2.1A	-	0.0555ohm	110nH	4.8mm	4.8mm	2.9mm	Surface Mount	-40°C	85°C	AEC-Q200