Thick film chips more than triple power ratings, says TT Electronics
High power density chip resistors in the HPDC series deliver high continuous and momentary load applications, says TT Electronics. According to the company, the chips on aluminium nitride (AlN) offer power circuit designers more than three times the standard power ratings for a given chip footprint.
The specialist design is optimised for power management, actuator drive, and heating applications which benefit from the enhanced heat transfer from element to terminal. The use of such high power density components saves PCB area and boosts reliability by restricting the temperature rise in the component hotspot.
According to Brian Stephenson, TT Electronics’ director of engineering, aluminium nitride, with its wide area solder terminations, gives the thick film resistors, the company’s highest power density to date. “With this product, our customers can reduce the size of their power conversion designs, while enhancing the reliability of the assembly through restricting the component hotspot temperatures,” he said. The resistors are suitable for applications with high momentary load conditions, such as power supplies, motor drives, power amplifiers, and actuator controls.
The HPDC series chip resistors use an aluminium 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. Heat generated in the resistor element is conducted away, reducing the temperature rise and allowing the 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 the HPDC resistors suitable for use in active capacitor bleed circuits. The high power resistors may also be used in temperature-controlled heating applications in which the power applied is restricted only by the maximum element temperature of 155 degrees C and the maximum termination temperature of 110 degrees C.
TT Electronics designs and manufactures sensors, power management and connectivity solutions. It has design and manufacturing facilities in the UK, North America, Sweden, and Asia.
