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Power Ratings by Substrate and Size

As the table shown here indicates, the substrate of choice has a significant impact on the amount of power a chip resistor can handle. All three substrate options are offered in sizes ranging from EIA 0201 to 5050. The beryllium-oxide substrate, because of its high thermal conductivity, can handle up to five times the power of alumina substrates of the same size, while aluminum-nitride substrates can handle around three times more power than alumina substrates of the same size. As the table indicates, the typical 0603 size chip resistor can handle 1 W on alumina while handling 5 W on beryllium-oxide. Similarly, a 5050-size chip resistor can handle 80 W on alumina, 270 W on aluminum-nitride, and 400 W on beryllium-oxide.

PTM Published on: 2024-03-15