Product Type: High Voltage

Specialty Resistors


KOA’s Specialty Thick Film Resistors offers enhancement to the traditional thick technologies with improved power and performance characteristics. The WK73(R/S) is our wide-side termination (reverse-geometry) type resistors which offers enhance power and improved thermal cycling capabilities  . The SG73 is superior in pulse and surge capability. The HV73 series (HV73/HV73V) offers a maximum overload voltage of 1000V as compared to the RK73, which has a maximum overload voltage of 400V. Our RS73/RK73G are precision thick resistors have a low T.C.R of ±25% and tolerance as low as ±.25%.


  • High reliability and performance
  • High precision resistors with a combined range of ±25 to 400x 10-6/ k and power rating range of .33W to 2W, and resistance tolerance levels from ±.5% to ±5%
  • The combined resistance range of these products is 10k to 51M
  • Operating temperature range -55°C to +155°C
  • Suitable for flow and reflow solder
  • Maximum working voltage
  • Products with lead-free terminations meet EU RoHS requirements. EU RoHS regulation is not intended for Pb-glass contained in electrode, resistor element and glass
  • AEC-Q200 Qualified


  • Car electronics
  • Power supply
  • AC adapters
  • DC-DC converter
  • Electronic equipment
  • Industrial equipment



KOA offers a complete line-up of Sulfur resistance Thick Film Resistors for those sulfur rich environments. This includes our Surge, Wide-Terminal, High Voltage, Sense Resistors, Precision and our General purpose Thick Film Resistors.


  • Excellent anti-sulfuration characteristics due to use of high sulfuration-proof inner top electrode material.
  • Excellent heat resistance and environmental resistance by applying metal glaze thick film to resistive film
  • High stability and high reliability with the triple-layer structure of the electrode
  • Suitable for flow and reflow
  • AEC-Q200 Qualified
  • Passes ASTM-B809 anti-sulfuration testing


  • Car electronics
  • Power supply
  • Industrial equipment
  • Agriculture
  • DC-DC converter
  • Battery management

KOA Speer

Whether you’re designing the car of tomorrow or connecting the Internet of Things, you need cutting-edge product solutions to bring your design to fruition.  At KOA Speer, we’re the ideal partner to help you do just that.  Our constantly expanding line of passive components will give you the solution to make your concept a reality!

More Than Just Resistors – yes we’re the world leader in thick film resistors, but our product line is broad and growing every day, including:

  • Shunt/Current Sense Resistors
  • Wide Terminal Resistors
  • High Voltage Resistors
  • Thin Film Chip Resistors
  • Surge Resistors

New Passive Component Solutions – our engineering group will work with your design team to develop the passive component solution you need.  Many of the hundreds of new products we’ve introduced in recent years are the result of such collaboration.

High Voltage & Ultra High Value Resistors

Ohmite has multiple part series for High Voltage applications. Due to multiple mountings and custom specifications, Ohmite is confident customers will find the proper High Voltage resistor required to fit their needs. With the custom specifications offered and multiple mountings, Ohmite High Voltage resistors fill the need for multiple applications including power supplies, avionics, medical instruments, and industrial controls.


High voltage chip (HVC) resistors offering working voltages up to 3500 volts.  Chip sizes from 0603 through 3512, Tolerance as low as 0.1%, and TCR as low as 25 ppm.  Resistance values up to 50G available.  Offers very low electrical noise and low VCR to 1 ppm / volt with excellent high voltage pulse handling.

High Voltage Chip Resistors

HVC resistors are ideally suited for handling by automatic methods due to their rectangular shape and the small dimensional tolerances. Electrical connection to a ceramic substrate or to a printed circuit board can be made by reflow or wave soldering of wrap-around terminations.


  • Continuous voltages up to 3kV
  • Overload voltages up to 4kV
  • Values up to 1G0
  • Tolerances to ±0.5%
  • TCR to ±50ppm/°C
  • 100% screened by automated optical inspection
  • 100% screened by high voltage overload
  • Anti-sulphur version available


  • Photomultiplier
  • Air ionizer
  • EDS Protection

Green High Voltage Chip Resistors

GHVC is the latest addition to our range of high voltage chip resistor products. It is essentially a variant of HVC designed using green thick-film materials which are completely free of Pb (lead) and its compounds. This allows the product to be RoHS compliant without relying on exemptionswhich may be withdrawn in the future. Available in three sizes from 1206 to 2512, GHVC has LEVs in the range 1 to 3kV and withstands up to 7kV peak for a 1.2/50μs surge. It is ideal for high voltage sensing and protection in compact power supplies, circuit breakers and medical monitors.


  • Free of Pb and its compounds
  • RoHS compliant without exemptions
  • Limiting element voltage up to 3kV
  • Overload voltage up to 4kV
  • Takes 1.2/50μs surge voltage up to 7kV
  • Anti-sulphur terminations standard


  • Power supplies
  • Circuit breakers
  • Medical monitor input protection

IRC / TT Electronics

We design and manufacture resistors and precision resistor networks. We are recognized as being an innovative leader in the design, development and manufacture of resistors since the very beginning of the electronics industry. We are trusted by designers to provide custom solutions for critical applications from space flight controllers to medical defibrillators.

Other TT Electronics brands include: BI Technologies, Optek ,and Roxspur


RCD is a US based ISO 9001/2008 manufacturer specializing in a breadth of capabilities across passive components.  40+ years of precision and power experience positions them as a leader in markets across the spectrum (instrumentation, audio, medical, military, aerospace & transportation to name just a few).  Their global agility meets the demands of service, quality, delivery and price in a changing landscape.  The RCD SWIFTTM Program is designed to be the “get out of jail” almost free card.  Don’t forget to ask us about it!

Stackpole Electronics

Founded in 1928, Stackpole Electronics is a leading global manufacturer of resistive components including Thick and Thin Film Surface Mount resistors, Axial Leaded and Wirewound resistors, Current Sense resistors, Varistors, Inductors and various Power Resistors.