Coilcraft KA4947-AE Coupled Inductor
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Designer's Kits

Flyback Transformer for the
Cymbet Universal Energy Harvester

  • Developed for the Cymbet CBC-EVAL-09 Universal Energy Harvester Evaluation Kit
  • Excellent coupling coefficient: K > 0.95
  • Other uses: step-up pulse transformer; coupled inductor in buck regulators; autotransformer
  • RoHS-compliant. 260°C compatible. Silver-palladium-platinum-glass frit 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 Ipk (A)4
L1 L2
KA4947-AE_ 2 : 1 400 1.10 0.875 0.45
1 When ordering, please specify termination and packaging codes: e.g. KA4947-AEC
Termination: E = Halogen free component. RoHS compliant silver-palladium-platinum-glass frit terminations.
Special order, added cost: 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 250 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 (1000 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 measured at 25°C on a micro-ohmmeter. For other operating temperatures, use this DCR at Temperature calculator.
4 Ipk: Peak primary current drawn at minimum input voltage.
5 Ambient temperature range: −40°C to +85°C with Ipk current.
6 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
7 Maximum part temperature: +125°C (Ambient + temperature rise)
8 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
9 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.

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Updated: April 16, 2018