In the majority of applications involving plastic surface-mount packages, most of the heat generated by integrated circuits will flow to the printed circuit board (PCB) by way of the package leads and then to In higher-power applications it is often necessary to attach a heat sink to the top of the package to keep the junction temperature of the chip within specified limits. … [Read more...]
High performance thermal management materials
Various new advanced composite materials are now available, which provide great advantages over conventional materials for electronic packaging thermal control, including: Extremely high thermal conductivities (up to twice that of copper) Low, tailorable coefficients of thermal expansion Extremely high strength and stiffness Low densities Low cost, net shape fabrication … [Read more...]
Determining the junction temperature in a plastic semiconductor package, part 1
One of the primary tasks of the thermal engineer is to determine the temperature of the junction (active circuitry on an integrated circuit) for the various packages in a system. Measurements performed in the industry-standard test environment are often used in this endeavor. The most common thermal metric [1,2] is the junction-to-air thermal resistance, JA (pronounced theta, … [Read more...]
Heat pipe fundamentals
The use of heat pipes in thermal management is increasing rapidly as power densities in electronics continue to rise. Heat pipes are attractive because they can typically carry 100 or more times as much heat as an equivalent piece of solid copper. The basic principle of heat pipe operation is very simple. A small amount of working fluid, typically water, is sealed inside a … [Read more...]
Heatsink attachment and thermal interface effects on production assembly and repair
Today's market offers many heatsink attachment and thermal interface options. Your design decisions usually aim to optimize product performance at minimum cost. Secondary effects, not always sufficiently considered, significantly impact production cost, delivery performance, and reliability. These effects stem from the impact of the heat sink attachment design on the product … [Read more...]
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