To resist the problem of corrosion the sulphur resisting BCN and ASC series thick film chip resistors feature special terminations that withstand sulphur-bearing gases. The conductors, resistive element, glass inner protection and epoxy outer protection are applied to an alumina substrate, and the chips are supplied with wrap-around terminations suitable for soldering. Terminations have an electro-plated nickel barrier and a RoHS-compliant 100% matt tin finish. These thick film chip resistors and resistor arrays offer standard sizes from 0201 to 2512, and values 1R0 to 10mega-ohms.
The thin film chip resistor series is available in 0402, 0603, 0805 and 1206 sizes with power ratings from 50mW to 333mW and values from 5ohms to 1mega-ohms. A Tantalum Nitride resistive film layer provides high precision and ultra-stable performance for long term reliability. Wrap-around terminations with leach-resistant Nickel barriers ensure secure and reliable solder connections.
All TT electronics’ sulphur resistant components have been qualified in accordance with ASTM international standard B809-95(2008): “Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor (Flowers-of-Sulfur)”, which demonstrates sulphide growth resistance.