Saturday, August 24, 2013

Power resistors offer superior high frequency performance


Riedon's new family of non-inductive power resistors is designed to achieve superior performance in high frequency applications and high speed pulse circuits.

The PF family of TO-style resistors all use an advanced power film formed on a heat conducting alumina substrate that is metalised and soldered to a heat dissipating copper plate tab, enabling excellent thermal resistance.

The various package configurations, listed below, cover power ratings from a few Watts up to 600W in both through hole and surface mountings.

The PF1260 is available in an epoxy-moulded TO-126 leaded package, with resistances in the range of 0.01 to 51kO, tolerances from ±1%, a temperature coefficient from ±50ppm.

The PF2200 and PF2470 offer a similar specification but with dissipation up to 50 and 140W respectively in leaded TO-220 and TO-247 packages.

The PF2270 uses the screw-terminal TO227 style package to handle up to 300W, when attached to an appropriate heatsink and subject to temperature derating.

Finally, the PFS35 provides a solution for surface mounting, using a TO-263 housing (D-Pak) to provide 35W dissipation when used with a heatsink or 2W with a simple solder pad.