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). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
B = Less than full reel
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 (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: January 20, 2020