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high power density chip resistors save PCB space

January 12, 2022 By Redding Traiger

TT Electronics announced the debut of its HPDC series high power density chip resistors. This specialist design is optimized for power management, actuator drive, and heating applications which benefit from the enhanced heat transfer from the element to the terminal. The use of such high power density components saves PCB area and boosts reliability by restricting the temperature rise in the component hotspot.

TT’s new HPDC series chip resistors use an aluminum nitride (AlN) ceramic substrate which has about six times the thermal conductivity of alumina – the conventional substrate material for chip resistors. HPDC chip resistors also feature large area terminations for improved thermal contact with a PCB. As a result, heat generated in the resistor element is effectively conducted away, reducing the temperature rise. This enables HPDC resistors to offer a high power density solution with ratings of 2.4W in 1206 and 3.5W in 2512 footprints. Short-term overload performance is also enhanced at 4.7W in 1206 and 7.7W in 2512 for five seconds, making HPDC ideal in active capacitor bleed circuits. In addition, these high-power resistors may be used in temperature-controlled heating applications in which the power applied is restricted only by the maximum element temperature of 155°C and the maximum termination temperature of 110°C.

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Filed Under: PCB Design, Power Electronic Tips Tagged With: ttelectronics

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