Thin film chip resistors meet latest anti-sulphur standards

The latest anti-sulphur standards are met by the APC series of thin film chip capacitors says TT Electronics. They are designed for automotive, industrial, and instrumentation applications.

The APC series of high reliability, surface mount resistors have been qualified for use in environments exposed to sulphur-bearing gases. They have stability and tight tolerances and are optimised for high precision analogue circuits deployed in polluted environments where sulphur compounds in fumes may react with metals in standard component terminations. The APC resistors are validated to rigorous anti-sulphur standards, and designed to reduce failure in harsh automotive, industrial, and instrumentation applications such as automotive battery management, roadside monitoring, vehicle maintenance equipment, industrial process control, portable test and measurement, and process monitoring in rubber, wine, petrochemicals, and waste.

Most anti-sulphur chip resistors are thick film with tolerance to 0.5 per cent and thyristor controlled reactor (TCR) of 100ppm/ degrees C, but the APC family offers thin film precision, improved on both counts by a factor of 10, according to TT Electronics. There are 19 combinations of size, sulphur protection grade and power range, to cover a broad array of resistance requirements for harsh applications. The APC series of resistors also provides accuracy and reliability without relying on coating, sealing, or encapsulation strategies, adds the company.

“APC’s anti-sulphur qualifications and low life drift add significant value in both performance and the overall system design process,” said Barry Peters, vice president of Product Management and Engineering, TT Electronics. “By reducing field failure costs for designers, these high-reliability resistors free up error budgets and enable precision requirements to be relaxed elsewhere in the design,” he added.

APC series resistors are anti-sulphur tested and qualified to both ASTM-B-905-95 and the newer EIA-977 standards, including tests of up to 1000 hours at 105 degrees C and up to 85 per cent relative humidity.

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