Size marking on the case is the bare core dimension (OD × ID × H), not the cased or finished size.
Nanocrystalline toroidal core 20×12×8 mm
20×12×8 mm nanocrystalline toroidal core, White PBT Class B 130C.
Soft-published ahead of stock. Expected availability October 20, 2026. The image is a dimension diagram; product photos will be added when inventory arrives.
CCNT-020-012-008-HFWH is a 20×12×8 mm nanocrystalline toroidal core for mid-power EMI filter chokes, SMPS common-mode filters, and small motor drive filters. Its nanocrystalline HF characteristic supports common-mode and EMI filter designs where impedance and winding window matter as much as size. Choose this size when the filter or choke needs this window and OD, not the next larger footprint.
Arriving October 20, 2026
$2.521 piece
This SKU is soft-published for selection and SEO. Product photos will be added when stock arrives. Request a quote now, or join the waitlist for an in-stock notice.
Technical Specifications
Bare core dimensions
Cased / finished dimensions
Magnetic properties
Finish and handling
Environmental
Applications and selection
Applications
- mid-power EMI filter chokes
- SMPS common-mode filters
- small motor drive filters
- LED driver EMI suppression
- mid-power (10–50W class) common-mode EMI filter chokes
- SMPS/LED driver differential-mode filters
- small VFD/motor controller EMI suppression cores
- auxiliary power filter chokes
When to choose this size
This 20×12×8 mm toroidal core is sized for mid-power EMI filter chokes and related designs in the nearby size family. Step down to the 16×10×6 mm core when board space, enclosure height, or a tighter footprint matters more than winding room. Move up to the 25×16×10 mm core when you need a larger outer diameter, winding window, or higher throughput than this part can comfortably support. In short, pick CCNT-020-012-008-HFWH when your design for mid-power EMI filter chokes fits this window and OD; pick a neighbor when compactness or power handling shifts the trade-off.
Winding notes
Magnetic calculations should use the bare 20×12×8 mm geometry (Ae 0.269 cm², Le 5.02 cm). The winding must fit the finished window: cased ID is 10.6 mm, not the 12 mm bare ID. Distribute common-mode windings evenly and keep leakage paths short for EMI filter performance. High permeability (μi 80,000) supports useful magnetizing inductance at practical turn counts; stay within 1.25 Tesla saturation and the -40°C to +130°C PBT Class B 130C limit.
Related application guides
Frequently asked questions
Are stated dimensions bare or cased?
The 20×12×8 mm size marked on the case is the bare core (OD × ID × H). Finished cased size is 22.6 × 10.6 × 10 mm. Use bare dimensions with Ae and Le for magnetic design, and the finished inner diameter for winding clearance.
Is this core suitable for EMI or common-mode filter work?
Yes. It is a nanocrystalline toroidal core commonly used for mid-power EMI filter chokes, including mid-power (10–50W class) common-mode EMI filter chokes. Size the turns and window for your common-mode impedance target while staying within saturation and temperature limits.
When should I choose a different size instead?
Choose the 25×16×10 mm core when you need more winding window, heavier wire, or higher throughput. Choose the 16×10×6 mm core when board space or a smaller footprint matters more than this 20×12×8 mm envelope.
Related products
Nanocrystalline toroidal core 20×12×8 mm
CCNT-020-012-008-MFBL
20×12×8 mm
Also listed as CC-NC-CMC-001-20
View CCNT-020-012-008-MFBL specsNanocrystalline toroidal core 16×10×6 mm
CCNT-016-010-006-HFWH
16×10×6 mm
View CCNT-016-010-006-HFWH specsNanocrystalline toroidal core 16×10×6 mm
CCNT-016-010-006-MFBL
16×10×6 mm
View CCNT-016-010-006-MFBL specsNeed this core for your application?
Get pricing, availability, and winding support for CCNT-020-012-008-HFWH.