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© Coilcraft Inc. 2013

This product may not be used in medical or high

risk applications without prior Coilcraft approval.

Specification subject to change without notice.

Please check web site for latest information.

Document 713-1

The LPR4012 miniature shielded coupled inductors are

only 1,1 mm high and 4 mm square.The excellent coupling

coefficient (k = 0.95) makes them ideal for use as flyback

transformers in DC-DC converters or as coupled inductors

in buck regulators to provide multiple outputs. The wide

selection of turns ratios makes them suitable for a variety

of voltage step-up and step-down applications. They can

also be used in autotransformer applications.

The high Isat and low DCR ratings of these low profile

parts provide high efficiency and excellent current handling

in a rugged, low cost design.

Custom inductance values and turn ratios are available

upon request.

Document 713-1 Revised 01/29/10

Primary (L1)

SRF

DCR max (Ohms)

± 20% (µH)

ratio

L1

L2

(MHz)

10% drop 20% drop 30% drop 20°C rise 40°C rise

LPR4012-202AML_

2.0

1

: 1.5

0.240

0.325

61.5

1.70

1.73

1.74

1.10

1.45

LPR4012-202BML_

2.0

1

: 2

0.240

0.480

49.4

1.70

1.73

1.74

1.10

1.45

LPR4012-202DML_

2.0

1

: 3

0.240

1.15

31.0

1.70

1.73

1.74

1.10

1.45

LPR4012-202LML_

2.0

1

: 10

0.240

11.62

7.43

1.70

1.73

1.74

1.10

1.45

LPR4012-103BML_

10.0

1

: 2

0.600

1.55

19.5

0.62

0.64

0.65

0.52

0.70

LPR4012-103DML_

10.0

1

: 3

0.600

3.71

12.8

0.62

0.64

0.65

0.52

0.70

LPR4012-223BML_

22.0

1

: 2

1.16

3.65

11.2

0.43

0.45

0.46

0.43

0.57

LPR4012-223DML_

22.0

1

: 3

1.16

7.08

8.00

0.43

0.45

0.46

0.43

0.57

1. When ordering, please specify

termination and packaging codes:

Termination: L = RoHS compliant Silver-palladium-platinum-glass frit.

Special order:

T = RoHS tin-silver-copper (95.5/4/0.5) or

S = non-RoHS tin-lead (63/37).

Packaging: C = 7

″ machine-ready reel. EIA-481 embossed plastic tape (1000 parts per full reel).

B = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter D instead.

D = 13

″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (3500 parts per full reel).

2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent.

3. SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value.

4. DC current applied to L1, at which the inductance drops the specified amount from its value without current.

5. Current applied to L1 that causes the specified temperature rise from 25°C ambient.

Refer to Doc 362 “Soldering Surface Mount Components” before soldering.

Coupled Inductors – LPR4012

ForStep-Up,Resonant

&FlybackApplications