With respect to moisture resistivity, a special passivation layer provides excellent protection of the resistive elements from humid atmospheres as verified against the 85°C / 85% biased humidity test for 1000 hours. Furthermore, with silver palladium inner terminations, the ACAS AT series is impervious to sulfur exposure as verified in accordance with the ASTM B-809 standard, tested against Vishay’s advanced conditions of 90°C for 1000 h instead of the usual ASTM standard conditions 50°C and 480 h. Incidents of corrosion failures related to high sulfur-containing environments are an increasing concern in the electronics industry and the ACAS AT series is well suited for applications which require sulfur resistant resistors.