In electronic equipment used in such environments, disconnection of flat chip resistors due to sulfuration may occur. In recent years, complete sulfuration resistant type flat chip resistors using non-sulfidation materials for internal electrodes, and sulfuration delaying types with a structure that prevents sulfur from entering inside have been developed.

KOA offers a series of complete anti sulfuration resistors with internal electrodes made from special materials that do not sulfide.

	Countermeasure	Effect
General type		Fair
Slow-sulfuration type		Good
Complete anti sulfuration type		Excellent

Electrolytic corrosion resistance of resistors

Electrolytic corrosions may occur when the thin film resistors made of the metal film are used in high humidity environment, resulting in disconnection. However, the metal film chip resistor RN73H , which has a special protective film inside, has improved moisture resistance compared to conventional products and is less susceptible to electrical damages. This product has superior moisture resistance compared to conventional products even under the condition of moisture resistance load life test for automotive applications which is considered to be severe.

Also, some general-purpose chip resistors such as RK73B use metal glaze for the resistive film, which has extremely high humidity resistance and does not cause electrolytic corrosion.

In addition, carbon film resistors such as CF, which are commonly used leaded resistors, may cause electrolytic corrosion on the carbon of the resistive element and lead to disconnection if used in a high humidity environment, as in the case of metal film resistors.

On the other hand, RCR, which uses metal glaze as a resistive element, has extremely high moisture resistance and is free from electrolytic corrosion.

Electrolytic corrosion resistant resistors