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A closer look at advances in power PCBs

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The standard epoxy used in FR-4 has a glass transition temperature, Tg, of 130° C, which is where it goes from being stiff to substantially more flexible and, even worse, also experiences a dramatic increase in its CTE. Where dT is temperature rise in° C and A is area in mm2.

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Specialized motor materials and constructions

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These metal glasses—which go by various trade names, such as Metglas, FineMet (Hitachi), etc—have extremely low hysteresis losses, but due to the difficulty involved in making them, they only come as continuously-cast, relatively thin ribbons (50 um is typical). Wire and insulation.