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ElectroComponent Science and Technology - Volume 9 1981, Issue 1, Pages 25-29

Department of Electrical Engineering, National Cheng Kung University, Taiwan, Tainan, China

Copyright © 1981 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The percentage variation of resistance of polymer thick film PTF resistors has been studied. Two different kinds ofpolymer resin, i.e., epoxy resin and polyimide resin, as well as four different kinds of carbon black are adopted in thepreparations of PTF resistors. Among the four different kinds of carbon black, i.e., ε45, MA-100, MA-600 andHS-500 all trade names, HS-500 shows the least variation with temperature changes. This can be attributed to thehigh structure property of HS-500 carbon black. The variation will be lowered down with an increase in the loadingfraction of carbon black in PTF resistors. Same tendency will be observed in both epoxy and polyimide resin PTFresistors. However, the variations are smaller in polyimide resin resistors than in epoxy resin resistors. The percentagevariations of resistance of PTF resistors, after stored at 120℃ for 1000 hrs, or after 25 cycle thermal shock tests, ordipped in a 200℃ solder pot for three seconds, as well as the variations after the short term overload tests, have alsobeen measured and studied. The variations are still smaller in polyimide resin PTF resistors. A possible explanation onthis smaller variation in polyimide resin PTF resistor is also presented.

Autor: Shen-Li Fu, Mong-Song Liang, Toyotaro Shiramatsu, and Tien-Shou Wu



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