WE-DD SMD Shielded Coupled Inductor

Characteristics:

1:1 transformer
Double inductor with two identical windings
4 different sizes available
Operating temperature: –40 ºC to +125 ºC
Recommended solder profile: Reflow
Custom designs on request

Applications:

For SEPIC and CUK topologies
Flyback applications
Switching regulators with second, unregulated output voltages

Dimensions

Size	A (mm)	B (mm)	C (mm)	D (mm)	E (mm)	Pin Layout
7332	7.3	7.3	4.0	2.7	4.0	Straight
7345	7.3	7.3	4.8	2.7	4.0	Straight
1260	12.5	12.5	6.5	4.9	7.3	Straight
1280	12.5	12.5	8.5	4.9	7.3	Straight
1260	12.5	12.5	6.5	4.9	7.3	Crossed
1280	12.5	12.5	8.5	4.9	7.3	Crossed
1210	12.5	12.5	10.5	4.9	7.3	Crossed

Electrical properties

7332

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
744878001	Straight	1.3	±20%	4.40	6.30	0.035	0.027	60
744878002	Straight	2.4	±20%	3.60	4.80	0.052	0.042	53
744878003	Straight	3.3	±20%	3.30	4.00	0.064	0.052	49
744878004	Straight	4.7	±20%	1.30	3.00	0.075	0.065	46
744878006	Straight	6.8	±20%	1.20	2.50	0.135	0.110	25
744878100	Straight	10	±20%	1.00	2.00	0.150	0.125	30
744878220	Straight	22	±20%	0.70	1.50	0.300	0.245	20
744878470	Straight	47	±20%	0.90	1.00	0.750	0.60	8
744878101	Straight	100	±20%	0.30	0.70	1.73	1.40	4

Special Design for SEPIC and CUK

High Leakage

Electrical properties

7345

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
744877001	Straight	1.8	±20%	4.70	6.50	0.034	0.025	58
744877002	Straight	2.4	±20%	4.20	5.60	0.042	0.031	50
744877003	Straight	3.3	±20%	3.70	5.00	0.052	0.040	46
744877004	Straight	4.7	±20%	1.55	3.30	0.064	0.052	42
744877100	Straight	10	±20%	1.10	2.80	0.120	0.110	27
744877220	Straight	22	±20%	0.80	1.80	0.260	0.215	16
744877101	Straight	100	±20%	0.65	0.90	1.30	1.029	4

Special Design for SEPIC and CUK

High Leakage

Electrical properties

1260

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
744874001	Straight	1.5	±30%	5.85	14.00	0.016	0.012	70
744874002	Straight	2.4	±20%	5.50	11.50	0.017	0.013	54
744874003	Straight	3.3	±20%	4.91	8.90	0.021	0.017	45
744874004	Straight	4.7	±20%	4.22	8.00	0.028	0.023	39
744874006	Straight	6.8	±20%	3.90	6.80	0.032	0.027	33
744874100	Straight	10	±20%	3.28	5.25	0.044	0.038	24
744874220	Straight	22	±20%	2.47	3.30	0.080	0.067	15.5
744874101	Straight	100	±20%	1.20	1.70	0.320	0.285	6

Suitable for flyback applications and secondary unregulated voltages

Low Leakage

Electrical properties

1280

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
744873001	Straight	1.5	±30%	6.25	18.00	0.015	0.011	75
744873002	Straight	2.4	±20%	6.00	14.00	0.016	0.012	54
744873003	Straight	3.3	±20%	5.14	11.00	0.022	0.017	41
744873004	Straight	4.7	±20%	4.87	10.00	0.024	0.019	32
744873100	Straight	10	±20%	3.81	7.20	0.036	0.031	20
744873150	Straight	15	±20%	3.30	6.10	0.055	0.041	14
744873220	Straight	22	±20%	2.79	5.00	0.070	0.058	11.5
744873330	Straight	33	±20%	2.25	3.90	0.105	0.087	8.9
744873470	Straight	47	±20%	2.02	3.10	0.120	0.110	7.8
744873680	Straight	68	±20%	1.66	2.80	0.180	0.163	5.5
744873101	Straight	100	±20%	1.38	2.20	0.255	0.235	4.4
744873221	Straight	220	±20%	0.91	1.60	0.580	0.540	2.8

Suitable for flyback applications and secondary unregulated voltages

Low Leakage

Electrical properties

1260

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
744871004	Crossed	4.7	±20%	3.00	8.00	0.028	0.023	20
744871006	Crossed	6.8	±20%	2.80	6.50	0.040	0.035	20
744871100	Crossed	10	±20%	2.00	5.00	0.050	0.044	20
744871220	Crossed	22	±20%	1.85	3.00	0.090	0.067	14
744871330	Crossed	33	±20%	1.20	2.80	0.170	0.125	6
744871470	Crossed	47	±20%	1.10	2.40	0.180	0.145	5
744871101	Crossed	100	±20%	1.50	1.80	0.360	0.293	4

Special Design for SEPIC and CUK

High Leakage

Electrical properties

1280

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
7448700015	Crossed	1.5	±20%	8.60	17.5	0.016	0.012	60
744870002	Crossed	2.4	±20%	7.80	15.0	0.018	0.014	40
744870003	Crossed	3.3	±20%	7.10	12.0	0.021	0.016	30
744870004	Crossed	4.7	±20%	3.60	10.0	0.030	0.025	34
744870006	Crossed	6.8	±20%	3.20	8.00	0.035	0.027	18
744870100	Crossed	10	±20%	2.70	7.00	0.044	0.038	18
744870220	Crossed	22	±20%	2.45	5.20	0.080	0.062	10
744870470	Crossed	47	±20%	1.45	3.10	0.150	0.125	5
744870680	Crossed	68	±20%	1.35	3.00	0.215	0.170	3.7
744870101	Crossed	100	±20%	1.40	2.00	0.300	0.230	4
744870151	Crossed	150	±20%	1.00	1.70	0.400	0.340	2.3
744870221	Crossed	220	±20%	0.90	1.40	0.650	0.530	2

Special Design for SEPIC and CUK

High Leakage

Electrical properties

1210

Order Code	Pin Layout	Inductance (µH)	Tolerance Inductance	Rated Current (A)	Saturation Current (A)	DC Resistance (Ω)	DC Resistance typical (Ω)	Self Resonant Frequency (MHz)
7448709100	Crossed	10	±20%	3.2	8.0	0.040	0.033	20
7448709220	Crossed	22	±20%	3.5	5.0	0.080	0.064	10
7448709330	Crossed	33	±20%	2.0	4.4	0.100	0.080	6
7448709470	Crossed	47	±20%	1.9	3.6	0.130	0.106	4

Special Design for SEPIC and CUK

High Leakage

Simulate your SEPIC design with our free WE Inductor Selector software on http://www.we-online.com/SEPIC

PLEASE NOTE:

Rated current of 40 K over the ambient temperature when windings are energized by the rated current mentioned

Saturation current - inductance loss of 10% typ when energizing one winding by Isat mentioned

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