Coilcraft CF2638L Common Mode Choke
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CF2638L Common Mode Choke
for Power Line Applications

  • Low profile toroid construction
  • Surface mount, magnetically shielded package
  • Up to 2.59 kOhms impedance at 4.5 MHz
  • 1000 Vrms isolation (hipot) between windings
  • Refer to Designing Common Mode Filters for design guidance.
  • RoHS-compliant. 260°C compatible. Tin-silver-copper over copper terminations.


Part number1
Click for details
Common mode
peak impedance
DCR  max4
nom min
CF2638L_ 2.59 @ 4.3 MHz 0.22 0.14 2.9 60 1000
1 When ordering, please specify packaging code: e.g. CF2638LD
Packaging: D = 13" machine-ready reel
EIA-481 embossed plastic tape (250 per full reel).
B = Less than full reel
In tape, not machine-ready. To have a leader and trailer added ($25 charge), use code letter D instead.
2 Inductance shown for each winding, measured at 10 kHz, 1.01 Vrms, 0 Adc on an Agilent/HP 4263B LCR meter or equivalent.
3 Irms: Current that causes a 40°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.
4 DCR is specified per winding at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Isolation (hipot) measured for two seconds
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 90 seconds (+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.

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Updated: April 16, 2018