In the past 12 months, we have been engaged in many online and print publications. Our technical articles have been picked up by many US and international editorials. We increased our online traffic by 30% and received many new customers because of our engagement with the Technical/Engineering community.
Just in case you missed them when they were published, here is the list of some of the articles:
Riedon, a specialist manufacturer and supplier of cutting-edge, resistive solutions, enables electronic equipment designs capable of meeting the demanding requirements of medical and aerospace applications and operating in the extreme environments encountered in the oil and gas industries. Whether it is for magnetic resonance scanners, aircraft flight controls or down-hole instrumentation for oil wells, Riedon’s advanced CHR and HVS chip resistor technology delivers high-performance, high-temperature operation with resistance values up to 10TΩ.
The maximum continuous working temperature of standard components with nickel/tin terminals is usually specified as +155oC (tin has a peak temperature of 230oC while nickel is limited to 160oC). By using superior materials, and combining an inner terminal of silver/palladium with a wrap-around of platinum/silver, Riedon is able to offer chip resistors that can work in applications up to 300oC. This special termination technology confers several other advantages for demanding applications. In particular it is suitable for silver epoxy attachment, which provides the reliability and high temperature performance essential for the temperature probes and pressure monitoring devices used in oil and gas exploration.
Further, by avoiding nickel, these chip resistors are completely non-magnetic and can be used in the presence of strong magnetic fields, such as medical CT and MRI scanners. Similarly, no tin avoids the ‘tin-whisker’ problem that can be a concern in aerospace applications. Termination material also influences VCR (voltage coefficient of resistance), an important characteristic of high voltage resistors.
Riedon’s chip resistors are specifically designed to achieve low VCR. The CHR series of non-magnetic chip resistor provides resistance values from 1 Ohm to 10MΩ with power ratings from 0.05W to 1.5W, depending on package size (from 0402 to 4020). Various resistance tolerances are available, from as low as ±0.5%, along with TCRs (temperature coefficient of resistance) specified from ±50ppm/oC. The standard temperature range is -55oC to +155oC with the HT version extending to +300 oC. Riedon’s HVS series of high-voltage, high-temperature, thick film chip resistors addresses requirements for higher value resistors, from 100kΩ to 10TΩ, with operation up to 6000V. Again, power-rating options are available up to 1.5W with an HT version provides high temperature operation up to +300 oC. VCR is also specified across the range, starting from as low as 10ppm/V. “High value resistors, up to 10 Tera-Ohms, are a core competency for Riedon”, said Phil Ebbert, their VP of Engineering, “Some other manufacturers only deliver up to 10MΩ. This, combined with our ability to achieve high precision and stability over a wide temperature range, is what distinguishes these Riedon products.”
Current shunt is a resistor with resistance as low as 100 microOhm.
Riedon offeres comprehensive range of high-power current-sense resistive products and technologies for power management, safety systems and motor control applications. Whether your power electronics circuits need precision current-sensing capability, superior thermal performance or space-saving packages, rieodn has the right resistor for your application, including economical axial devices with ratings up to 5W; bare metal element, and through-hole styles, and or high current metal-element chip resistors. Call us so we can help you with your application needs.
Riedon announces the introduction of two new series of resistors that use Bulk Metal ™ Foil technology to deliver superior performance. The new UHPL series of through-hole molded resistors provides high precision with a tolerance of ±0.005%, a TCR of ±2ppm and a load life stability of ±0.005%. The ultra-high precision, surface mount UHPC series achieves an extremely low TCR of ±0.05ppm with a power coefficient of 5ppm at rated power and a load life stability of ±0.005%.
Bulk Metal ™ Foil technology outperforms all other resistor technologies available today for applications that require high precision and high stability. The UHPL series resistors are built to handle unconventional environmental conditions with minimal drift over more than 10,000 hours while offering tight tolerance, fast response time, low current noise and low thermal EMF. Typical applications include high-precision instrumentation and differential amplifiers. The UHPC series builds on the same Bulk Metal ™ technology to provide a significant reduction in the resistive element’s sensitivity to ambient temperature variations (TCR) and to self-heating when power is applied (Power Coefficient of Resistance, or PCR). This all helps achieve the remarkable load life stability, low noise and tight tolerances that characterize this design and suit it to applications such as automatic test equipment, precision measuring instruments and medical imaging. The UHPC resistor has a full wraparound termination that assures secure contact during the manufacturing process, as well as providing stability during multiple thermal cycles.
Wirewound resistors have some very desirable characteristics. They have superior surge handling capability. They can offer higher precision and more tightly controlled temperature coefficients than any other technology. And, they are more stable. Several applications are especially important. The need to extend battery life in all types of portable devices has opened a new growth market for low-value SMT current sensing resistors. These resistors have values as low as 0.005 ohms in power ratings from 0.25 to 2 watts.
Many of Riedon’s power resistors have high power ratings. Although power requirements are typically less than two watts for digital circuitry, ratings above two watts are common for industrial applications such as motor controls, assembly equipment, and robotics.
Medical and industrial instrumentation markets typically rely on high-precision and high-power leaded devices. These are good applications for wirewound resistors.
New solid-state power devices with high voltage ratings (IGBT, IGCT, MC, MTO) are creating fresh demand for passive components with high power, high voltage and high current ratings. This new technology could cause a market “rebirth” for wirewound resistors.
This list shows some of the applications we serve:
- Battery-testing equipment
- X-ray equipment Flowmeters
- Power supplies Medical Equipment
- Transducers Instrumentation
- Lighting controls
- Machine tools
- Motor controls
- Metering systems
- Industrial power drives
- Computers and peripherals
- Industrial control systems
- Gas monitoring systems
- Engine monitoring systems
- Telephone switching systems
Alhambra, California, USA, 22 March 2013 – Specialist manufacturer and supplier of cutting-edge, resistive solutions, Riedon, provides all the advantages of precision wirewound resistor technology with designs that are easily customized for specific applications and can also be produced economically in low volumes.
Riedon’s standard wirewound resistors are offered in various series to meet different performance requirements across a range of body styles. These include precision, axial-leaded parts, such as its 100, SM and PC series devices as well as the high-power axial and aluminum-housed resistors in its UT and UAL series. Surface mount options are also available in its S and SL series of wirewound devices.
Wirewound resistors offer levels of performance that cannot be matched by other resistor technologies; they can be manufactured with great precision, enabling tolerances down to 0.005%. They are extremely stable (15 to 50ppm/year) and operate reliably over extremely wide temperature ranges, from -55oC to +350oC, with temperature coefficients (TCR) as low as 1ppm/oC. In addition, wirewound resistors can handle high level pulses and transients, and dissipate substantial amounts of power, up to 2.5kW in some instances.
According to Riedon’s VP Engineering, Phil Ebbert, “Wirewound devices provide the best, and sometimes the only, solution for many applications and excel where accuracy is important. For example, wirewound resistors remain the technology of choice for demanding pulse-rated applications.”
Ebbert went on to explain, “The relatively simple construction of a wirewound resistor, which has remained unchanged for many years, allows them to be easily customised. Not only can engineers specify exactly what they require, but the manufacturing process also enables us to supply in quantities of hundreds, rather than tens of thousands, if required.”
More information on Riedon’s standard resistor product lines and options for custom designs are available from www.riedon.com or by contacting Riedon directly for samples and quotations.
The modern electronics industry is in a constant struggle of increasing performance while decreasing size and cost. To help you succeed, Riedon introduces its PFC series resistors.
These modern, high-power surface mount chips replace standard TO-126 (25W) SMT packages with a PCB pad compatible chip only 1mm (0.04”) thick, a decrease in thickness of over 75%. In addition to the size advantage, the PFC is over 25% less expensive than standard TO style SMT packages.
The back of the chip is metalized for excellent thermal dissipation to your PCB and/or heat sink. Wrap around terminations bring the connections to the top of the chip where a high quality, power film resistor resides.
The non-inductive design offers superior performance in high frequency and high-speed pulse applications. Click here to see the spec sheet:
Wirewound resistors have been around for a long time. They enjoy a long life because they have some very important features not duplicated by new technology products. If you must optimize circuit designs where precision is important, you should understand those characteristics.
For most of the history of electronic and electrical circuits, wirewound resistors were the only game in town for precision resistances. Wirewound precision resistors have some important characteristics. First, they can have very tight resistance tolerances . . . 0.005% is commonly achieved. More important, they are stable (15-50ppm/yr) maintaining their precision over time because they are made with stable materials. Their TCR (Temperature Coefficient of Resistance) is low (<10ppm/°C) and can be controlled by selecting special wire alloys. (Usually, you need the lowest TCR, but a higher TCR has special interest in some applications.)
In the past, the bulk of the resistor market went to carbon composition products. They are not accurate; you can sort them to tolerances of about 1% at best. They are unstable, have poor TCR (1000 ppm/C) and generate electrical noise. Low cost is their advantage. Now, film technology products are replacing carbon resistors. Continue to read here.
High temperature components available for applications up to 300°C
High value resistors with a value range up to 10 Tera-Ohm
Non-magnetic resistors available
High voltage capability of chip resistors up to 6000V
Every value is available
Suitable for lead free soldering as well as silver epoxy attachment
Whisker free surfaces - no Tin whiskering
Suitable for vacuum applications – no organics
Low VCR at extreme high values
Lately, there has been a rise in popularity in use of Light Emitting Diodes (LED) due to the advantages they provide over existing technologies. LEDs provide nearly identical output in a smaller package, consume less energy and have a much longer lifespan than other lighting technologies. In order to avoid over-powering these devices, it is important to control the temperature and current drawn by the LEDs to maximize the benefits of the technology.
To efficiently use LEDs in a reliable manner, it is necessary to limit the device current and the most cost-effective way to do this is to use a resistor. Selection of the correct resistor will involve knowledge of the recommended operating current of the LED and the application of Ohm’s Law to find the correct resistance value. Once the resistance value is identified, the power dissipated by the resistor can be determined, again by Ohm’s Law, and the correct power rating can be selected for the resistor. In most cases the resistor will only need to dissipate 1/4W or 1/2W and simple carbon film resistors may be satisfactory. For applications that require a higher power rating of between 1/2W to 10W, Riedon recommends our UT series of wirewound power resistors. For even high power ratings, greater than 10W, Riedon recommends the UAL series, aluminum housed wirewound resistors with ratings to 50W and above, with properly heat-sinking.
An additional factor to consider is the ambient operating temperature of the LED and whether that temperature would lead to device failure. One method for keeping the temperature within operating range is the incorporation of heatsinks to carry heat away from the LED. Riedon offers a variety of heatsink mountable high power resistors that would be appropriate to use in high power applications in which heat may compromise the reliability of the LED. For example, Riedon’s PFS35 is a 35W device in a TO-263 package that is designed to be mounted on a heatsink.
Riedon resistor products which are ideal for higher-power LED lighting applications. Please contact Riedon directly for a discussion of your specific application. click her to see the selection