Size marking on the case is the bare core dimension (OD × ID × H), not the cased or finished size.
Nanocrystalline toroidal core 45×30×15 mm
45×30×15 mm nanocrystalline toroidal core, Black PBT Class B 130C.
CCNT-045-030-015-HFBK is a 45×30×15 mm nanocrystalline toroidal core for UPS EMI filters, inverter common-mode chokes, and industrial power supply 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.
Technical Specifications
Bare core dimensions
Cased / finished dimensions
Magnetic properties
Finish and handling
Environmental
Applications and selection
Applications
- UPS EMI filters
- inverter common-mode chokes
- industrial power supply filters
- motor drive line filters
- UPS/backup power common-mode EMI filters
- industrial inverter output chokes
- industrial power supply EMI suppression cores
- motor drive AC-line filter chokes
When to choose this size
This 45×30×15 mm toroidal core is sized for UPS EMI filters and related designs in the nearby size family. Step down to the 40×32×15 mm core when board space, enclosure height, or a tighter footprint matters more than winding room. Move up to the 50×32×15 mm core when you need a larger outer diameter, winding window, or higher throughput than this part can comfortably support. In short, pick CCNT-045-030-015-HFBK when your design for UPS EMI filters 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 45×30×15 mm geometry (Ae 0.92 cm², Le 11.8 cm). The winding must fit the finished window: cased ID is 27.6 mm, not the 30 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 45×30×15 mm size marked on the case is the bare core (OD × ID × H). Finished cased size is 48.2 × 27.6 × 17.9 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 UPS EMI filters, including UPS/backup power common-mode EMI filters. 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 50×32×15 mm core when you need more winding window, heavier wire, or higher throughput. Choose the 40×32×15 mm core when board space or a smaller footprint matters more than this 45×30×15 mm envelope.
Related products
Nanocrystalline toroidal core 40×25×15 mm
CCNT-040-025-015-HFWH
40×25×15 mm
View CCNT-040-025-015-HFWH specsNanocrystalline toroidal core 40×25×15 mm
CCNT-040-025-015-MFBL
40×25×15 mm
Also listed as CC-NC-CMC-005-40
View CCNT-040-025-015-MFBL specsNanocrystalline toroidal core 40×32×15 mm
CCNT-040-032-015-HFWH
40×32×15 mm
View CCNT-040-032-015-HFWH specsNeed this core for your application?
Get pricing, availability, and winding support for CCNT-045-030-015-HFBK.