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LPR4012 Series

Coupled Inductors for Step-Up & Flyback Applications

RoHS compliant halogen free
This is a new halogen free version recommended for new designs. Only the termination material and part number have changed. The previous version is available only to current customers.
Coilcraft LPR4012 Series low-profile 1:N coupled power inductors are ideal for a variety of voltage step-up and step-down applications, including low voltage step-up in energy harvesting designs. They offer excellent coupling coefficient (K > 0.95) and 100 Vrms, one-minute isolation (hipot) between windings.
  • Perfect for low voltage step-up in energy harvesting applications
  • Different turns ratios for a variety of voltage step-up and step-down applications.
  • Coupled, low profile shielded power inductor – only 1,1 mm high, 4 mm square
  • Uses: flyback transformers in DC-DC converters; coupled inductors in buck regulators to provide multiple outputs; autotransformers
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Specifications

Electrical specifications at 25°C.

For Flyback Applications

Part number 1 Inductance (µH) 2
(Tolerance: ±20%)
DCR (Ω) 3 Isolation
Voltage (V)
Turns Ratio
L1 max L2 max
LPR4012-202AMR_ 2.0 0.24 0.33 100 1 : 1.5
LPR4012-202BMR_ 2.0 0.24 0.48 100 1 : 2
LPR4012-202DMR_ 2.0 0.24 1.2 100 1 : 3
LPR4012-202LMR_ 2.0 0.24 11.6 100 1 : 10
LPR4012-103BMR_ 10 0.60 1.6 100 1 : 2
LPR4012-103DMR_ 10 0.60 3.7 100 1 : 3
LPR4012-223BMR_ 22 1.2 3.7 100 1 : 2
LPR4012-223DMR_ 22 1.2 7.1 100 1 : 3

For SEPIC Applications

Part number 1 Inductance (µH) 2
(Tolerance: ±20%)
DCR max (Ω) 3 SRF typ (MHz) 4 Isat (A) 5 Irms (A) 6
L1 L2 10% drop 20% drop 30% drop
LPR4012-202AMR_ 2.0 0.24 0.33 61.5 1.7 1.7 1.7 1.5
LPR4012-202BMR_ 2.0 0.24 0.48 49.4 1.7 1.7 1.7 1.5
LPR4012-202DMR_ 2.0 0.24 1.2 31.0 1.7 1.7 1.7 1.5
LPR4012-202LMR_ 2.0 0.24 11.6 7.4 1.7 1.7 1.7 1.5
LPR4012-103BMR_ 10 0.60 1.6 19.5 0.62 0.64 0.65 0.70
LPR4012-103DMR_ 10 0.60 3.7 12.8 0.62 0.64 0.65 0.70
LPR4012-223BMR_ 22 1.2 3.7 11.2 0.43 0.45 0.46 0.57
LPR4012-223DMR_ 22 1.2 7.1 8.0 0.43 0.45 0.46 0.57
Notes
  1. When ordering, please specify termination and packaging codes: e.g. LPR4012-223DMRC
  2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent.
  3. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator
  4. SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value.
  5. Isat: DC current applied to L1 at which the inductance drops the specified amount from its value without current.
  6. Irms: Current applied to L1 that causes the specified temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings. Determine temperature rise.

Termination:

  • R = Matte tin over nickel over silver.
  • Q = RoHS tin-silver-copper (95.5/4/0.5). (Special order, added cost)
  • P = non-RoHS tin-lead (63/37). (Special order, added cost)

Packaging:

  • C = 7" machine-ready reel
    EIA-481 embossed plastic tape 1000 parts per full reel).
  • B = In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to C
  • D = 13" machine-ready reel
    EIA-481 embossed plastic tape. Factory order only, not stocked (3500 parts per full reel).
Environmental
Environmental:
RoHS compliant , halogen free
Ambient temperature range:
−40°C to +85°C with Irms current.
Storage temperature range:
Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
Maximum part temperature:
+125°C (Ambient + temperature rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
38 per one billion hours/ 26,315,789 hours

Schematics

lpr4012_schem.gif

Physical characteristics

lpr4012d.gif
dims_inches_mm.gif

Tape and Reel specification

tapereel_pl-(16).gif


 
Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
7" (178 mm) 13" (330 mm) A B C D E W P Po P1 H T part_or_aj.gif
1000 3500* 178/330 60/100 13 18,4 12,4 12 8 4 2 1,32 0,25
* Special order

General specification

Core Material:
Ferrite
Weight:
54 - 64 mg
Packaging:
1000/7″ reel; 3500/13″ reel Plastic tape: 12 mm wide, 0.25 mm thick, 8 mm pocket spacing, 1.32 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
Recommended Pick & Place Nozzle:
OD: 4 mm; ID: ≤ 2 mm
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.