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Power resistor dissipates heat three ways

Posted: 20 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:TT electronics? BI Technologies? SMT Division? BHP75? power resistor?

BHP75 series resistors from BI Technologies SMT Division

TT electronics BI Technologies SMT Division said it has developed a non-molded power resistor rated up to 75W, providing design engineers with an open-screened substrate device for applications requiring superior thermal performance. Designated the BHP75 series, the resistor is housed in a TO-220 open-screened substrate package, and features an insulated tapered venturi bonded to the substrate for maximum heat dissipation.

According to Jim Rieley, sales director for BI Technologies' SMT Division, the design of the BHP75 Series resistor allows for three methods of heat dissipation, resulting in exceptional power handling characteristics. "The chimney-shaped tapered venturi is attached to the ceramic substrate and convection forces hot air up the 'neck' of the chimney and away from the resistor face of the component," Rieley said. "The power resistor utilizes all three methods of heat dissipation, including conduction through the heat sink tab, radiation from the resistor surface, and convection through the venturi element."

Typical applications for the BHP75 resistor include higher wattage switchmode power supply circuits, motor control and drive circuits, inverters and industrial power equipment.

The BHP75 Series resistors are rated for 75W power dissipation at tab temperature maintained at 25C or less than 75W. Resistance ranges from 1 ohm to 100 kiloohms, with tolerances of 1 percent and 5 percent. TCRs range less than 100ppm/C, with maximum DC operating voltage of 250V and dielectric-withstanding voltage of 1KV. Thermal resistance is 1.3C/W from the resistor's "hot spot" to the package's metal flange and operating temperature range is -55C to 155C.

BI Technologies will also produce devices outside these specifications to meet customer requirements, with comprehensive application engineering and design support available for customers worldwide.

Typical pricing for the BHP75 Series resistors is $1.80 each in medium volumes. Lead time is from stock to six weeks. Samples are available immediately for engineering evaluation and customer prototypes.

For a free engineering evaluation sample of the SMHP Series power resistors, or for more information, visit TT electronics BI Technologies SMT Division.

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