Oasis Materials Corporation

Tripent Power LLC

Stephen P Nootens

Frank J Polese

Jonathan H Harris

Sorin Dinescu

William L Bradbury

Casey C Clausen

Robert J Tesch

Steven S Scrantom

A power electronic interposer () for mounting a number of power transistor integrated circuit dice () can be made from a multi-layer ceramic process to provide an aluminum nitride body () having internal tungsten traces (-) to electrically connect die bond pads () to interposer contact pads () allowing connection to circuitry off of the interposer. The traces can include one or more groupings of parallelly spaced apart conductive vias () that are connected in an electrically parallel manner to reduce electrical resistance and inductance in the circuitry. A network of cooling conduits and optional resistance temperature detector traces can be run through other parts of the body to provide controlled active cooling. The interposer can be formed separate ceramic bodies bonded together, to package the dice.

Aluminum nitride multilayer power module interposer and method

A monolithic, substantially hermetic joining or bonding of two or more aluminum nitride ('AlN') ceramic components is made by promoting transient liquid phase sintering near the contact areas between the components. In a first approach, AlN particles are combined with a rare earth oxide sintering additive such as yttrium oxide (YO) in a joining paste can be applied between the joining surfaces of fired ceramic preformed components prior to final firing to weld the components together. In a second approach, the additive is added to green mixture, and the components having different shrinkage aspect ratios are mated and cofired in an atmosphere containing a partial pressure of the additive. The additive encourages wetting and diffusion of the liquid phases present on the surfaces of ceramic interface particles in the contact areas during final firing.

Transient liquid phase, pressureless joining of aluminum nitride components

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San Diego, CA, United States of America

Stephen P Nootens