Ferrite cores are the core components of electronic transformers, and their material selection directly determines the efficiency, volume, and stability of the equipment. As mainstream materials in the MnZn soft ferrite family, PC40, PC44, and PC95 all belong to power supply-specific series but differ significantly in performance focus and application scenarios. Below is a detailed analysis.

PC40 is a versatile material with a magnetic permeability of 2300-3000, balanced loss, and a working frequency range of 10kHz-500kHz. It is suitable for most conventional electronic transformers and offers outstanding cost-performance ratio. The inductance fluctuation is 130% at 100℃, making it ideal for environments with stable temperatures. It is widely used in industrial PFC inductors and regular adapters, and also paired with general-purpose switching power transformer bobbins such as the PQ2620 model. It has the largest market stock and a mature supply chain.

PC44 focuses on high frequency and high efficiency, with a magnetic permeability of 3000-3500. Its high-frequency loss is 20%-30% lower than that of PC40, and its working frequency extends to 1MHz, making up for PC40’s shortcoming in high-frequency applications. It has moderate temperature stability and is suitable for high-frequency and high-energy-efficiency requirements. It is the preferred choice paired with gallium nitride fast charger and server power transformer bobbins. Its low-loss characteristic can improve power supply efficiency by 3%-5%, meeting high-energy-efficiency standards such as COC_T2.

PC95 has a magnetic permeability of 6000-8000 (2-3 times that of the previous two), enabling transformer miniaturization, with a working frequency range of 1kHz-100kHz. The inductance fluctuation is only 30% at 100℃, featuring the best temperature stability but relatively high high-frequency loss. It mainly targets wide-temperature and high-load scenarios, and is used with on-board charger transformers and industrial high power DC-DC converter bobbins. It can suppress heat generation above 100℃ and ensure stable equipment operation.

The selection principle follows "frequency determines direction, scenario determines material": choose PC40 for medium-low frequency and cost-performance focus; select PC44 for high-frequency and high-energy-efficiency needs; opt for PC95 for wide-temperature, miniaturization, or automotive scenarios. The cost of the three increases in turn (PC95 is 30%-50% more expensive than PC40), but only precise matching with the scenario can achieve a balance between performance and cost.

There is no absolute superiority or inferiority in the material selection of electronic transformers—only suitability. If you are still unsure how to choose the right ferrite core, feel free to contact us at any time.

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