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Power Density Rating for Embedded Resistors



Jan Obrzut, Jason D. Ferguson, MIchael H. Azarian


The Power Density Ratting (PDR) for Embedded Resistors test method covers procedures for the demonstration of the ability to operate the embedded device safely within nominal tolerance, at rated power, and to withstand the transient voltage waves resulting from switching or momentary voltage surges in the power bus without a permanent change in the electrical characteristic of the device. The procedure consists of monitoring a resistance change from its nominal value as a function of the dissipated power. During the test, the applied voltage is increased from a typical operational level until the change in the measured resistance exceeds the tolerance criteria for the device. The results are presented in terms of the dissipated power density rating (PDR) factor for the embedded resistive device. The test can be also useful in process control, quality acceptance, reliability projections, and in determining the suitability of the device material for specific applications and environmental conditions.
IPC D-54 Embedded Devices Test Methods Subcommittee


embedded resistors, power dissipation, test method


Obrzut, J. , Ferguson, J. and Azarian, M. (2012), Power Density Rating for Embedded Resistors, IPC D-54 Embedded Devices Test Methods Subcommittee, [online],, (Accessed April 19, 2024)
Created July 9, 2012, Updated February 19, 2017