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Nanocrystalline Cut Cores

Precision-cut nanocrystalline C-cores for PFC boost inductors, EV onboard chargers, solar string inverters, and DC reactors. Matched cut pairs with published a–f geometry, AL, and production photos.

Overview

CenturaCores nanocrystalline cut cores are openable C-shaped pairs cut from high-permeability ribbon and epoxy-coated for handling. The openable path simplifies bobbin winding and lets you set a controlled air gap for DC-biased inductors where a closed nanocrystalline toroidal core would be harder to wind or would saturate under bias.

Compared with ferrite, nanocrystalline offers higher saturation (about 1.25 T) and lower core loss in the tens-of-kHz band used by PFC and onboard charger stages. Compared with CRGO, it stays efficient at switcher frequencies where silicon steel runs hot. See our nanocrystalline vs CRGO vs ferrite guide for material trade-offs.

Every stocked SKU publishes a–f×R dimensions, Ae/Le, AL at 1 kHz / 10 kHz / 100 kHz, pack pricing, and photos of the gap face, assembled pair, lamination edge, and QC checks. Custom gap, stack, and AL targets are available via request a quote.

Stocked nanocrystalline cut cores

Matched cut pairs with published a–f dimensions, AL values, and production photos. Buy online or open a product page for gap, assembled, caliper, scale, and lamination views.

Size comparison

Each size is a matched cut pair with published a–f dimensions, AL at 1 kHz / 10 kHz / 100 kHz, and production photos. Need a custom gap or stack? Request a quote.

CCNC-09-09-32-15-28-51-002-MFGR

Nanocrystalline cut core 9×9×32×15×28×51×2 mm

AL 205 µH/T² @ 1 kHz

View CCNC-09-09-32-15-28-51-002-MFGR specs

CCNC-10-10-33-20-31-53-002-MFGR

Nanocrystalline cut core 10×10×33×20×31×53×2 mm

AL 310 µH/T² @ 1 kHz

View CCNC-10-10-33-20-31-53-002-MFGR specs

CCNC-11-12P5-29P5-20-35-53-002-MFGR

Nanocrystalline cut core 11×12.5×29.5×20×35×53×2 mm

AL 330 µH/T² @ 1 kHz

View CCNC-11-12P5-29P5-20-35-53-002-MFGR specs

CCNC-11-13-40-20-35P5-63-002-MFGR

Nanocrystalline cut core 11×13×40×20×35.5×63×2 mm

AL 270 µH/T² @ 1 kHz

View CCNC-11-13-40-20-35P5-63-002-MFGR specs

CCNC-10P8-13-40P5-25-35P5-62-002-MFGR

Nanocrystalline cut core 10.8×13×40.5×25×35.5×62×2 mm

AL 370 µH/T² @ 1 kHz

View CCNC-10P8-13-40P5-25-35P5-62-002-MFGR specs

CCNC-13-15-56-25-42-84-002-MFGR

Nanocrystalline cut core 13×15×56×25×42×84×2 mm

AL 350 µH/T² @ 1 kHz

View CCNC-13-15-56-25-42-84-002-MFGR specs

CCNC-19-24-83-35-63P5-122-002-MFGR

Nanocrystalline cut core 19×24×83×35×63.5×122×2 mm

AL 400 µH/T² @ 1 kHz

View CCNC-19-24-83-35-63P5-122-002-MFGR specs

Applications and design notes

PFC boost inductors

Gapped nanocrystalline cut cores handle the DC bias in continuous-conduction PFC boost stages used in EV charger and power cores and industrial SMPS. Higher Bs than ferrite keeps the core smaller for the same peak flux.

EV and solar reactors

Use cut cores for EV charging station reactors, OBC DC inductors, and solar string inverter filter/reactor stages where window area and gap control matter more than a closed toroid path.

Thermal and gap control

Low high-frequency core loss reduces hotspot temperature versus ferrite at the same induction. Keep clamping consistent so gap variation does not shift AL or create audible noise. Quote custom gap when your L and Ipeak need a different AL than the stocked pair.

Air-gap customization

Stocked CCNC parts ship as matched pairs with published AL. For designs that need a larger gap (more DC bias headroom) or a tighter gap (higher AL), CenturaCores can cut and finish to target inductance. Provide frequency, Lmin/Lmax, DC bias, Ae preference, and max temperature when you request a custom cut-core quote.

  • • Custom gap for PFC boost and DC reactor AL targets
  • • Stack / build changes when envelope allows more Ae
  • • Epoxy finish color and coating for production handling
  • • Prototype-to-volume path from the same geometry family

Typical magnetic envelope

  • Saturation Bs: about 1.25 T
  • Initial permeability μi: typically ~80,000 (ungapped ribbon reference)
  • AL: published per SKU at 1 kHz, 10 kHz, and 100 kHz
  • Operating design range: -40°C to +130°C
  • Curie temperature: ~560°C
  • Finish: green epoxy coating on stocked MF series cut cores

Size the inductor with the transformer / inductor core designer or compare materials in the material selection article.

Frequently asked questions

When should I use a nanocrystalline cut core instead of a toroid?

Choose a cut core when you need an openable magnetic path for bobbin or form-wound coils, a controlled air gap for DC bias (PFC boost inductors, DC reactors), or easier production winding than a closed toroid. Use a PBT-cased toroid for common-mode chokes, CTs, and closed-path EMI designs where the winding stays on a continuous ring.

Can CenturaCores customize the air gap on stocked cut cores?

Yes. Published AL values assume the as-shipped matched cut pair. For PFC boost inductors, EV onboard charger reactors, and solar string inverter stages, we can quote custom gap, stack height, and AL targets. Request a quote with your frequency, inductance, DC bias, and thermal limits.

How do nanocrystalline cut cores compare on core loss versus ferrite or CRGO?

Nanocrystalline typically delivers much lower core loss than ferrite at tens of kHz with higher saturation (about 1.25 T), and far lower high-frequency loss than CRGO. That combination suits compact PFC boost inductors, EV charger reactors, and DC reactors where ferrite would saturate or run hot and CRGO would be oversized at switcher frequencies.

What temperature range do these epoxy-coated cut cores support?

Published magnetics cover roughly -40°C to +130°C continuous design space, with Curie temperature near 560°C. Stay within the epoxy coating temperature class for continuous duty, and account for hotspot rise from copper and core loss when designing clamps and bobbins.

What do the a–f×R dimensions mean on CCNC part numbers?

Published geometry uses a (tongue width), b (build), c (window length), d (strip width), e (window height), f (overall length), and R (corner radius), all in mm. Use Ae and Le with that geometry for magnetic design. Each product page lists AL at 1 kHz, 10 kHz, and 100 kHz with production photos of the gap, assembled pair, and lamination edge.

Engineering notes by Manoj Kumar, Founder & Chief Technologist at CenturaCores.

Need a custom gap or stack?

Share your PFC, EV charger, or solar inverter inductor targets and we will match a stocked CCNC size or quote a custom cut.

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