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Surface Mount Power Resistors Handle up to 12 W
August 30, 2005 |Estimated reading time: Less than a minute
RALEIGH, N.C. — The HPC series surface mount power resistors reportedly can handle up to 12 W at 85°C. Available in 5-, 10- and 12-W ratings, the resistors range from 0.1 Ω to 100 KΩ in a 0.5 × 0.5 × 0.5" package size in tape-and-reel and bulk packaging from Stackpole Electronics, Inc. (SEI). The HPC Series employs conventional thick film chip resistors bonded to the flat surface of a subminiature aluminum extruded housing, which is designed to transfer heat from the initial resistor/aluminum interface to all other parts of the aluminum structure. The surface area of the aluminum housing is said to exhibit a precise thermal resistance to air moving over that complete surface area. While the housing has integral J-lead type pads, the housing's design transmits only a fraction of the resistor-generated heat to the PCB. While at maximum power, even though the resistive element can be at 150°C, the PCB solder pads reportedly will remain well under 105°C.