Film resistor technologies have come a long way since metalised glass and cracked carbon films were first offered over eighty years ago as alternatives to the bulk material approaches of wirewound and composition. Metal oxide emerged in the s as a more stable film and was widely applied until ceding ground to metal film for precision and thick film for high power uses. Both of these technologies were then employed in the emerging SMD chip format. However, it would be a mistake to think that nothing is changing in the world of film resistors. This paper identifies three drivers of continued evolution and outlines some of the developments which are being made in response. The first driver is the imperative to reduce environmental impact and is felt through legislated regulation and, indirectly, consumer pressure.
Advances in Film Resistor Technology – European Passive Components Institute
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The conceptually simple idea to determine current by measuring voltage across a known resistor shows the subtle nature of design tradeoffs. Part 1 of this article looked at one important aspect of the choice of resistor value in current-sensing applications, but it was only the electrical impact. However, the thermal impact related to resistor I 2 R self-heating power dissipation is also significant and plays into the integrity of the reading as well as resistor selection. The dissipation of even a small-value resistor with modest current can cause significant drift from nominal value.