App note: Advantages of sulfur-resistant film resistors

Special type of SMD resistors from Bourns that are resistant to most environmental pollution. Link here (PDF)

In recent years, the long term reliability of film chip resistors in a high sulfur environment plays an increasingly important role in a wide range of market segments such as industrial electronics, IT systems and telecommunications. Sulfurous environments have a negative impact on film resistors by reacting with elements, in particular silver. Sulfide growth can cause resistors to go open circuit.
The critical environmental factors of sulfur pollution are:
• Where oils, lubricants or fossil fuels are used
• Rubber seals, gaskets, grommets or molded coatings of affected material
• Air polluted industrial area or areas containing biological or volcanic gasses

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