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Document 752R-1

Coupled Inductors – LPR6235
HalogenFreeFor Step-Up, Resonant& Flyback Applications• Miniature shielded coupled inductors used as step-up or flyback transformers in DC-DC converters or as autotransformers• Perfect for low voltage step-up in energy harvesting applications• Selected by Linear Technology for the LTC3108 and LTC3109
Ultralow Voltage Step-Up Converter and Power Managers• 300 Vrms, one minute isolation (hipot) between windings• 3.5 mm high and 6 mm square• Excellent coupling coefficient (k = 0.95); ideal for use in a variety of applications such as flyback transformers and step-up
pulse transformers.
• High Isat and low DCR ratings provide high efficiency andexcellent current handling in a rugged, low cost design• Custom inductance values and turn ratios are available
upon request

AEC

Q200 +85°C			
Primary (L1) DCR max
PartTurns inductance2 (Ohms)
number1
ratio ±20% (µH) L1  L2SRF
typ3 Isat4(kHz) (A)LPR6235-253LMR_ 1 : 10
LPR6235-253PMR_ 1 : 20
LPR6235-123QMR_ 1 : 50
LPR6235-752RMR_ 1 : 90
LPR6235-752SMR_ 1 : 100

1300
580
360257
230

2525
12.5
7.5
7.5

0.74
13.7
0.20
720.085 200
0.085 285
0.085 340

CDVIND

1.3
0.7
0.9
1.6
1.6C

L1

VOUT

Sync
Rectifier

L2
C

1. When ordering, please specify packaging code:
LPR6235-253PMRC
Packaging: C = 7″ machine-ready reel. EIA-481 embossed plastic tape(350 parts per full reel). Quantities less than full reelavailable: in tape (not machine ready) or with leader andtrailer ($25 charge).
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 ofyour part number from B to C.
D = 13″ machine-ready reel. EIA-481 embossed plastic tape.
Factory order only, not stocked (1500 parts per full reel).
2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc for -253LMR. All othervalues are measured at 10 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.
4. DC current applied to L1, at which the inductance drops 10% from its value
without current.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.

Typical Step-Up Converter++DL1VIN

L2

C

VOUT

C–PWM

–

Typical Flyback Converter

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 752R-1Revised 12/13/21© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 752R-2

Step-Up / Flyback Transformers – LPR6235
Core material Ferrite
Weight 460 – 480 mg
Environmental RoHS compliant, halogen freeTerminations RoHS compliant matte tin over nickel over silver.
Other terminations available at additional cost.
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C
Winding to winding isolation 300 Vrms
Resistance to soldering heat Max three 40 second reflows at+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /85% relative humidity)
Packaging 350/7″ reel; 1500/13″ reel Plastic tape: 16 mm wide,
0.3 mm thick, 12 mm pocket spacing, 3.68 mm pocket depth
Recommended pick and place nozzle OD: 6.2 mm; ID: ≤ 3.1 mm
PCB washing Tested to MIL-STD-202 Method 215 plus an additionalaqueous wash. See Doc787_PCB_Washing.pdf.

HalogenFreeAEC

Q200 +85°C

Dimensions are ininchesmm

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 752R-2

Revised 12/13/21© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.