CONVECTION HEAT-TRANSFER FROM A HYBRID CIRCUIT

Accurate values of heat transfer coefficient are needed for simulation of the thermal characteristics of a thick film resistor. In this pape r, the results of an investigation are presented where an optical tech nique is used to study the convection plumes from a horizontally posit ioned hybrid resistor package. The observations have shown that simpli fying approximations to the convection coefficients may be made in the rmal analysis of such devices. Using these approximations and an optim ization technique, values have been estimated for the coefficients.