Product Type: Resistors

Custom Resistive Products

In addition to our catalog products, RCD offers hundreds of design variations as well as a wide range of fully customized components. While some other component manufacturers prefer to produce only their standard product line, RCD has been a “specialty” manufacturer for over 3 decades. We don’t mind custom and/or difficult items. in fact, we love a challenge so don’t hesitate to inquire. Single piece quantities to millions of pieces. If you need a resistor that will operate at cryogenic temperatures, in an acidic atmosphere, at frequencies over 100GHz, etc. contact us.

  • Wirewound, film, composition & foil technologies
  • Ratings to 300KV, 15KVA, 150KJoule
  • Various heat-sink & water-cooled designs
  • Microwave frequencies (up to 112GHz)
  • Variable resistors/rheostats
  • Shunts & current sense resistors, SM and leaded
  • Load box & grid resistors
  • Capacitor-mount charging resistors
  • Ballast resistors, thermistors, varistors
  • Edgewound & dynamic braking resistors
  • Harsh atmosphere (oil, sulfur, salt water, etc)
  • Embedded Resistors, Polymer Circuits, IPC’s
  • Networks, hybrids, attenuators, LTCC circuits
  • Temperature-sensitive resistors, RTD’s
  • Low distortion audio resistors
  • Fusible resistors (single shot and resettable)
  • Matched pairs, sets, networks
  • Thick film on steel (resistors/circuits/networks)
  • Micro-resistors (axial, radial, SM, wirebond)
  • Custom lead forming & extensions, fast-on terminals
  • High vibration, shock and aerospace applications

LRMAP3920 Series – Power Resistor

LRMAP3920 gives designers stable and accurate sensing of AC and DC currents up to 150A/200A in a compact chip resistor format.

  • Bulk metal alloy technology
  • Large copper terminations for minimal joint resistance
  • Power ratings up to 10W & 15W continuous
  • Resistance values 200µΩ to 5mΩ, Tolerance to ±1%
  • Low thermal impedance minimizes temperature rise and enhances reliability
  • High surge tolerance gives reliability under inrush and momentary short circuit conditions

Applications

  • Power supply units
  • Motor control
  • Battery monitoring
  • Power hybrids

CTS Corporation

CTS Corporation – Your Partner in Smart Solutions, founded in 1896, is a leading designer and manufacturer of components that help Sense, Connect, and Move your product designs, including encoders, rotary position sensors, potentiometers, DIP switches, tactile switches, EMI/RFI Filters, frequency control, RF filters, and capacitors or resistors. CTS focuses on providing advanced technology, exceptional customer service, and superior value to global partners by supplying OEMs in the aerospace, communications, defense, industrial, information technology, medical, and transportation markets. CTS aims to be at the forefront of technology, delivering innovative sensing, connectivity, and motion solutions for the creation and advancement of products and services around the world.

OARS Series – Surface Mount Sense Resistors

OAR & OAR-XP resistors give designers stable and accurate sensing of AC and DC current in a compact SMD format, while elevating the hotspot off the PCB. Features include:

  • Bulk metal technology
  • Open air design reduces PCB heating
  • Flexible leads to mitigate thermal expansion
  • Power rating 2W, 3W & 5W
  • Values down to 1mΩ
  • ±1% tolerance
  • TCR to 50ppm/ °C
  • Zero-ohm 65 amp jumper version

These resistors are available in a comprehensive range of powers and resistance values.

Datasheet

Specialty Resistors

  • WIDE TERMINAL – WK73
  • SURGE CURRENT – SG73
  • HIGH VOLTAGE – HV73
  • HIGH RELIABILITY– RS73/ RK73G

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%.

Features

  • 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

Applications

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

Current Sense / Shunt

  • METAL PLATE –TLR, SL
  • WIDE TERMINAL– WU73
  • POWER SHUNTS – PS*
  • THICK FILM – UR73/ SR73

KOA Speer offers a complete family of Current Sense Resistors capable of sensing large to small currents with ultra-low resistance down to 0.2mΩ. The large current sensing PS series provides high power ratings of with ultra-low resistance, as low as 0.2mΩ. The TLR series offers a more even thermal distribution of heat and enhanced reliability. The thick film UR73/SR73 offers low resistance values from 0.15Ω to 10mΩ with a power rating of up to 2W. The wide terminal WU73 combines high reliability and performance with a T.C.R of ±75-100 x10-6 k and resistance tolerance of 1%.

Features

  • Large current, high precision
  • High reliability
  • Metal Plate resistive element
  • Low resistance
  • Mold package
  • AEC-Q200 Qualified

Applications

  • Car electronics
  • Personal computing devices
  • AC-Adapter and DC to DC conversion
  • Current detection in ECU
  • Power supplies

Anti-Sulfur

  • ANTI-SURGE – SG73-RT
  • WIDE TERMINAL-WK73-RT
  • HIGH VOLTAGE – HV73-RT
  • CURRENT SENSE – SR73-RT
  • GENERAL PURPOSE- RK73B/H/Z-RT
  • PRECISION – RK73G/ RS73

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.

Features

  • 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

Applications

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

Thin Film

  • METAL FILM- RN73R, RN73H
  • THIN FILM NETWORK– CNN
  • THIN FILM NETWORKS-RIA, RNX

The metal film RN73 series combines high tolerance with high performance and provides an improved moisture resistance with high humidity coating. The thin film networks pair resistors for high precision OP-amplifiers and, as custom products, any pairs between 1kΩ and 100kΩ are available upon request.

Features

  • High precision tolerance ±0.05% to ±1%
  • Excellent in relative TCER and relative accuracy
  • Products with lead-free terminations meet EU RoHS and China RoHS requirements
  • Suitable for flow and reflow
  • Suitable for control circuits in various industrial equipment
  • AEC-Q200 Qualified

Applications

  • Car electronics
  • Industrial equipment
  • Medical equipment

Chip Resistors

  • GENERAL PURPOSE – RK73B
  • PRECISION – RK73H
  • ZERO OHM – RK73Z

KOA Speer provides chip resistors that are small enough for handheld devices and powerful enough for the automotive industry. The RK73Z zero Ohm jumper thick film chip resistor has a silver element. Available in 0.5, 1, 2 and 5% tolerance.

Features

  • 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

Applications

  • Car electronics
  • Medical equipment
  • Power supplies
  • Home appliances
  • Ecology and energy savings smart meter technology
  • Communications (smart phones and tablets)

Leaded Resistors

  • METAL FILM – MF
  • CARBON FILM– CF
  • METAL OXIDE- MO
  • CERAMIC – HCP
  • WIRE-WOUND – BWR/BSR/BGR

KOA Speer offers a wide variety of leaded resistors consisting of different materials. Each type offers a unique advantage. The semi-precision metal film MF resistor meets the requirements of MIL-R-22684. The MO has a flameproof silicone coating equivalent to UL94V0. The carbon film CFP of the CF series has a flameproof coating. The ceramic HPC resistor offers anti-pulse characteristics and are non-inductive. The BGR, BWR, BSR, a ceramic case resistor flame-retardant insulated case, are high power resistors that are excellent with anti-pulse and inrush current with cores of wire-wound and oxide tecnology

Features

  • Suitable for automatic machine insertion
  • Product with lead-free terminations meet EU RoHS and China RoHS requirements
  • AEC-Q200 Qualified

Applications

  • High voltage circuits for x-ray generators and electron microscopes
  • Power supply
  • Flyback transformer