Accurate Piston-Chip Impact Monitor for TCM
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
A thermal conduction module (TCM) consists of a large ceramic substrate upon which are mounted about 100 chips. Each chip is attached to the module by an array of 120 solder pad terminals. In order to remove heat from the chip, an aluminum piston rests on the back side of each chip and is held in place by a spring to maintain intimate contact between the piston and the chip. Fig. 1 shows the configuration for one chip on a module. If the module is bumped or dropped, the piston can impact the back of the chip. It is important to know if a module has been subjected to any impact and also the magnitude of the impact. Shock watches have been attached to modules, but they only indicate that the shock watch itself has been subjected to a specific impact level.