With respect to moisture resistivity, a special two-layer passivation provides protection of the resistive element from humid atmospheres as verified according to the 85°C/85 % biased humidity test for 42 days. Furthermore, with silver palladium inner terminations, the MCW AT series is impervious to sulfur exposure as verified in accordance with the ASTM B 809 standard. As an increase in incidents of corrosion failures related to high sulfur-containing environments has been observed in the electronics industry, the MCW AT series is best suited for applications which require sulfur resistant resistors.

