Power-Film Resistor Series PF available now

Different from wire-wound-resistors, film-technologies have limitations with respect to power-to-size-ratio, max. working-temperatures and overload- or pulseload-capabilities, but in contrary offer a wider resistance-range

Traditional Metal-Oxide-technologies (i.e. Vitrohm PO-series) are based on tin-oxide-film, deposited from a wet-process, creating a relatively “thick” layer of approx. 1,5 µm.
As tin-oxide withstands higher temperatures, a good power-to-size-ratio is achieved at reasonable load-life-stability and good overall performance, including temperature-coefficients around 200 ppm/K.
Due to film-thickness, this technology still provides pulse-load-capability, that outranges any other thin-film technology.

Metal-oxide-resistors, made in thin-film-processes, using evaporation or sputtering for film-deposition, became commodity-products in global markets, due to their economic appeal.
Film-thickness from this process ranges at around 100 nm, making the resistors sensitive to overload- and pulse-conditions.
General parameters are comparable with the “real” metal-oxide-products.

VITROHM PF power-film-series uses materials, known from standard metal-film-technology, especially NiChrome-alloys, but with extended temperature-range up to 250°C.
Typical parameter are comparable with metal-film-resistors:
Stability < 2%
Temperature cycling < 1%
Temperature coefficient < 100 ppm/K

But additionally:
small-size, high power-rating
high working-voltage up to 750V
and good pulse-load-capabilities.

For further questions and samples request please send an e-mail to: vitrohm.support@yageo.com

For the data sheet please click here

go back