Features and Applications of Power Soft Magnetic Ferrite Cores
                     Features and Applications of 
Power Soft Magnetic Ferrite Cores 
Overview
The ferrite core is made up of iron oxide (Fe2O3) plus one or more 
additional metal oxides or carbonate compounds (such as 
manganese, zinc, nickel, and magnesium). Ferrite raw materials are 
compressed, then sintered at high temperatures, and machined to 
generate a completed magnetic core that matches the application's 
requirements. In comparison to other forms of magnetic materials, 
ferrite has high magnetic permeability, high resistance across a 
wide frequency range, and low eddy current loss.
www.cosmoferrites.com
Following series of soft ferrite cores are used in switch mode power 
supplies (SMPS), radio frequency (RF) transformers, common mode 
choke inductors, filters and chokes. 
• EFD Cores • EQ Cores
• RM Cores • EPC Cores
• PQ Cores • EP Cores
• ER/EC Cores • POT Cores
• EE/EF Cores • UU/UF Cores
• ET/UT Cores
www.cosmoferrites.com
EFD cores
RM cores 
I. Applications: various low-power switching power supply transformers, chokes, etc. 
I. Applications:carrier frequency inductor, power conversion 
transformer, auxiliary power transformer. 
II. Size: EFD10 EFD12 EFD17 EFD20 EFD20L EFD25 EFD30 EFD50 
II. Size:RM4 RM5 RM6 RM7 RM8 RM10 RM12 RM14 
PQ cores ER / EC / EER / ETD cores 
I. Applications:switching moce power supply transformers, choke I. Applications: Suitable for various power forms such as single-ended 
coils. flyback, forward push-pull, half-bridge, full-bridge; home appliances, 
communications, lighting, office automation, satellite TV receiving 
II. Size:PQ20 PQ26 PQ32 PQ35 PQ40 PQ50 systems, military products and other industries. 
www.cosmoferriItI.e Ssiz.ec:EoR2m8 ER30 ER35 ER39 ER40 ER42 EC52 EC70 EC90 EC120 
EE / EF cores EQ cores 
I. Applications: switching power supply transformers, chokes, I. Applications: carrier filters, high-sensitivity sensors, power 
inverters, converters, pulse transformers, etc. conversion transformers, etc. 
III. Size: EE8.3 EE13 EE16 EE19 EE25 EE28 EE55
II. Size: EQ20 EQ25 EQ30 EQ38
EPC cores EP cores 
II. Uses:transformers with small size and high power and shielding 
and electromagnetic compatibility requirements, such as precision II. Uses:switching mode power supplies, high frequency transformers, 
instruments, program control switch module power supplies, coil inductors. 
navigation equipment, etc. 
III. Size:EP5 EP7 EP10 EP13 EP17 EP20 EP30
III. Size:EPC10 EPC13 EPC17 EPC19 EPC25 EPC37 
www.cosmoferrites.com
POT cores UU / UF cores 
II. Uses:carrier filters, high-sensitivity sensors, high-efficiency II. Uses:Filter common mode inductor, widely used in color 
sensors, power conversion transformers, etc. televisions, computers, monitors. 
III. Size:P05 P07 P11 P14 P18 P22 
III. Size:UU9.8 UU10.5 UU15.7 UU16 UU18 UU21 
ET UT cores 
II. Uses:color display power supply, liquid crystal display power 
supply, computer switching power supply, video phone, walkie-
talkie and other linear transformers. 
III. Size: ET20 ET24 ET28 ET35 
www.cosmoferrites.com
Thank You
If you need more assistance, you can feel free to connect with our 
experts who will take you through our wide range of ferrite products 
available for several applications. Contact us to learn more.
https://www.cosmoferrites.com/contact-us/sales-inquiry
www.cosmoferrites.com