Electronic Components Blog

Monday, 25 July 2016 14:17

KOA Anti Sulfuration Resistors Expanded Line-up

KOA Anti Sulfuration Resistors Expanded Line-up

KOA’s special anti-sulfuration resistors are intended to be used under harsh environment with a high level of sulfur contamination. A high reliable material with extremely high sulfuration-proof characteristics is used in the inner top electrodes. Thanks to technical know-how of sulfuration-proof material, KOA has been able to achieve an extremely high level of sulfuration-proof performance.

Sulfuration is a phenomenon that the inner electrodes (Ag/Pd-type material) of chip resistors react with sulfur gas which creates silver sulfide. As sulfuration proceeds, the conduction of the inner electrode will be lost and the chip resistor gets disconnected. 

Sulfuration phenomenon on standard Chip resistors
Image 1

 Examples of Critical Environment

  • Oil or grease for machine tools and gears sometimes includes sulfur substances
  • Oil with high amount of impurities and exhaust gas after combusting the oil contains sulfur gas
  • Rubber products or areas near rubber manufacturing plants
  • Where fossil fuels are handled or used
  • In case a PCB is molded by rubber sealing which includes sulfur
  • In case components which generate sulfur are mounted in the surrounding (e.g. molded coatings which includes sulfur)
  • Areas where volcanic gases are emitted
  • Areas of biological gas cracking plants
  • Near waste dumps / waste disposal sites


KOA’s Anti-Sulfur Resistors Line-up
 

The low ohm resistor series WK73S in the resistance range below 1 ohm will be added soon
to KOA’s anti-sulfuration product portfolio.

Product Features

  • Excellent anti-sulfuration characteristic due to using high-sulfuration-proof inner top electrode material
  • Available for several standard product series (like RK73, SG73, CN)
  • Intended for use under harsh environment


Application Examples

  • Industrial control systems
  • Automotive
  • Electric instrumentation
  • Power meter / conditioner
  • Solar / wind inverter circuits
  • Avionics


Please also find attached a link to the overview of our anti sulfuration SMD resistor series on the KOA webpage:
https://www.koaglobal.com/en/product/smd-resistor.aspx#CategoryTitle2

Download Blog as PDF

Please contact your Heynen rep. for more (purchasing) information.

Related Solutions

  • Low profile braking resistor, optimized design for high energy to heat conversion

    When designing a motor controller, which has to be as compact as possible, every engineers challenge is to deal with the heat dissipation which is being generated when braking the motor. Using the BRK-series of Isabellenhütte as a braking chopper, you're able to resist high energy loads. It's ideal for use on Inverters, EV pre-charging & current limiting applications.

  • Ideal precision shunt for extreme conditions

    When you're working on the design of a power application for extreme temperature conditions and you'd like to measure voltage or current, you might run into limitations. When the internal temperature of your application is rising, the constant load capacity of your shunt decreases and the long-term stability is put to the test.

  • A freely configurable sensor module for current, voltage and temperature

    Charge and discharge cycles have an impact on the longevity of lithium ion batteries used in electric vehicles and the ultra-capacitors used for energy storage in photovoltaic systems. For this reason, it is necessary for battery safety and longevity to be able to establish the state of charge (SoC) and the state of function (SoF).

  • Isabellenhütte achieves record current measurement on shunt basis

    30,000 amperes measured, 100,000 amperes next target!

    Isabellenhütte Heusler GmbH & Co. KG, Hesse, Germany, has made inroads into the high-current range of industrial applications with shunt current measurement. The measurement of currents of up to 30,000 amperes using low-ohmic shunts can truly be seen as unique. Moreover, the company's next target is 100,000 amperes.

Supplier

  • Koa

    KOA of Japan is reputed for their high quality passive components ranging from Resistor products, PTC & NTC Themistors, Thermal Sensors, Inductors (Chip & Wire wound), Choke Coils, Toroidal Coils and Noise Suppression Components Micro Fuses

Related Blog messages

  • Current measurement system designed for high dielectric strength

    IVT-S: Designed for high dielectric strength in traction batteries and stationary energy storage devices

    With its newly developed, shunt-based IVT-S measurement technology, Isabellenhütte is responding to the market, which now favours specified functions in current measurement systems. The main focus is on achieving dielectric strength that is as high as possible in line with the intended application. High dielectric strength must be guaranteed in battery-powered vehicles, for example.

  • Isabellenhütte New IPC-SII (IPC-MOD)

    IPC-SII is Isabellenhütte's newest addition in their IPC-MOD family.
    As a result of intensive dialogue between SEW Eurodrive GmbH (Bruchsal) and ISAscale®, the IPC-MOD series will now get a new product line which fulfils requirements for frequency inverters in the range from 40 kW up to 200 kW (nominal current measurement ranges from 160 A to 540 A). SEW Eurodrive GmbH is one of the market leaders in the frequency inverters for machine tools application field.

  • New Molded 7W Current Sensing Resistors for Automotive

    The new SLN5, flame proof, molded SMD current sensing resistor from KOA now also allows a power rating of 7 W and has a T.C.R. down to ±75 ppm/K. The terminal design absorbs solder junction stress reducing the possibility of solder cracks.