Coilcraft LPR6235 Step-Up and Flyback Transformers
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LPR6235 Coupled Inductors for
Step-Up & Flyback Applications

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.
  • Different turns ratios for a variety of voltage step-up and step-down applications.
  • Perfect for low voltage step-up in energy harvesting applications
  • Selected by Linear Technology for their LTC3108 and LTC3109 Ultralow Voltage Step-Up Converter and Power Managers
  • Excellent coupling coefficient: K > 0.95
  • 300 Vrms, one minute isolation (hipot) betweeen windings
  • RoHS-compliant. 260°C compatible. Matte tin over nickel over silver terminations
  • COTS Plus tin-silver-copper and tin-lead terminations available


Part number1
Click to get parts
Primary (L1)
±20% (µH)
DCR max (Ohms)3 SRF typ4
Isat (A)5
L1 L2
LPR6235-253LMR_ 1 : 10 25 0.74 13.7 1300 1.3
LPR6235-253PMR_ 1 : 20 25 0.20 72 580 0.7
LPR6235-123QMR_ 1 : 50 12.5 0.085 200 360 0.9
LPR6235-752RMR_ 1 : 90 7.5 0.085 285 257 1.6
LPR6235-752SMR_ 1 : 100 7.5 0.085 340 230 1.6
1 When ordering, please specify termination and packaging codes: e.g. LPR6235-253PMRC
Termination: R = Matte tin over nickel over silver
Special order, added cost: Q = RoHS tin-silver-copper (95.5/4/0.5) or
= non-RoHS tin-lead (63/37).
Packaging: C = 7" machine-ready reel
EIA-481 embossed plastic tape 350 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 C instead.
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 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.
5 Isat: DC current applied to L1 at which the inductance drops 10% from its value without current.
6 Ambient temperature range: −40°C to +85°C with Irms current.
7 Storage temperature range: Component: −40°C to +125°C.
Tape and reel packaging: −40°C to +80°C
8 Maximum part temperature: +125°C (Ambient + temperature rise)
9 Resistance to soldering heat: Three reflows at >217°C for 90seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
10 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

Your comments and suggestions are welcome. Contact [email protected]
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Updated: July 29, 2019