Piston-Like Structure With Electrically Isolating Plate Contacting Chip and Metal Structure Attached to Plate
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-27
Some circuit modules have a thin, flat chip support, an array of chips on the upper surface of the support, and a cylindrical, thermally conductive member called a piston that releasably contacts the upper surface of the chip and conducts heat from the chip to a heat sink. The piston can be arranged to provide electrical isolation between the chip and the heat sink. Many piston-like structures have been proposed. This piston-like structure has a plate of beryllium oxide that contacts the chip and metal pins that are attached to the upper surface of the plate and extend to the heat sink. The plate can be larger than the chip. The plate is formed by a known process that provides a smooth lower surface for good contact with the chip. The upper surface is formed with shallow cylindrical cavities where the pins are to be located.