Designers in today’s power electronics often face two common challenges when building a new product, one is to reduce loss at high frequencies, the other is to guarantee safety at high voltages. To address these issues, one material was developed, the PEN(Polyethylene Naphthalate) taped litz wire. So how this litz wire benefit products at high frequency and voltage? Let’s take a look.
1.Due to skin effect, alternating current (AC) tends to flow mostly on the outer surface of conductor rather than uniformly through its center, which increases AC resistance and causes heat. Litz wire with a construction of multiple individually insulated strands (typically from 2 up to 25,000 strands), forces current to distribute evenly across the entire conductor cross-section. This helps minimize AC losses and keeps temperatures under control, even at operating frequencies up to 500 kHz.
2.The multi-strand construction is then wrapped with PEN (Polyethylene Naphthalate) film tape, offering a low dielectric constant of just 2.9, reducing capacitive coupling and energy loss. The most important is that PEN taped litz wire provides a high dielectric strength, enabling reliable operation at voltages up to 1000 Vrms. Additionally this robust film insulation provides excellent mechanical protection and resistance to bending stress.
3. PEN film has a temperature rating of Class H (180°C) continuous operation, significantly outperforming normal PET film, and is a reliable insulation material which can function well under high temperature while other materials normally soften and fail.
With these properties, PEN wrapped litz wire will be a good choice for engineers to develop next-generation power converters, EV chargers, and industrial drives and gives the optimal balance of high-frequency performance, high-voltage reliability, and thermal stability. If you are looking for hf litz wire and high voltage solutions, please mail our sales engineer for support.
Post time: Jun-28-2026
