Riedon offers a complete line of wirewound power and precision resistors:

• Our Surface Mount designs fit modern high efficiency manufacturing methods

• For current sensing, we offer surface mount and metal element designs for PC board mounting and leaded 4-terminals products. Resistances are available to 0.003 ohms

• mounting, and leaded 4‑terminal products.Resistances are available 0.003 ohms.

• We make precision wirewound resistors with tolerances to 0.005% and long-term stability of 100 PPM/year

• For power applications, we offer axial lead, aluminum-house, TO-220, flameproof ceramic-housed, and high power tubular resistors.

• Besides wirewound resistors, we can also supply metal fil, resistors, thick film resistors and networks.

We know that our standard resits products will not fit all applications.We can often fill your special needs with customized designs. Please call us so we can help you with your unique resistors needs.

Riedon's low Ohm resistors

Sudden current or voltage changes are often hazardous to electronic products. For example, transients or surges that reach microprocessor or memory components can destroy those expensive parts, and wipe out critical programming and data. Many electronic products now include surge protection circuits.

In these circuits, low value resistors sense when the current is too high so that measures can be taken upstream before the excess current causes damage. Wirewound resistors are a popular choice for these applications. They are inexpensive, available in low resistance values, have low temperature coefficients and good surge-handling capability. Riedon has served this application for years with their "LO OHM" power resistors

Riedon is on Twitter

Now you can follow us on Twitter. Here is the link.

Looking for resistors with Lead (Pb) content to avoid Whisker Growth? Buy Riedon resistors

Military-aerospace subcontractors and suppliers of electronic systems and components continue to have a strong interest in COTS (commercial off-the-shelf) procurement to control costs. However, some designs require that terminations have lead (Pb) content to avoid tin whisker growth.

Most components manufactures, including Riedon, have converted their commercial products to Pb-free terminations as required by environmental regulations. this can make COTS procurements difficult.

However, Riedon can supply resistors product that meet Pb content requirement. Simply request that the terminations be tinned. Please call us for more detailed information.

High Temperature Resistors

Riedon has been at the cutting edge of resistive solutions for more than 40 years. High temperature resistors are in demand in many applications, now more than ever! Riedon's Wirewound, Thick & Thin Film, and also Foil resistive products can be seen in industries as diverse as: Aerospace, Military, Instrumentation, and Medical Devices. Here is the list of our "high temperature" resistors: CHR Series - Non Magnetic Chip Resistors (-55°C to +155°C - Standard) (-55°C to +300°C - HT Version)

HVS Series - High Resistance - Thick Film Chip Resistors (-55°C to +155°C to 250°C upon request)

Wirewound HT Type S and SL - Surface Mount Power Resistors (-55°C to +275°C)

UT Series - Silicone Coated Power Resistors (-55°C to +250°C) ane (-55°C to +350°C)

100 Series, SM Series, PC Series - Precision Wirewound Resistors (-55°C to +145°C)

Please call us to get more information

Riedon's Custom Resistors

Flexibility is a key design feature in Riedon resistors, and we structure our manufacturing processes to support this concept. Our goal is to build advanced products that meet your exact requirements, yet complete the process from design to delivery in a minimum time and at a reasonable cost.

Sub-Assemblies and Cable Assemblies
Our flexible manufacturing facility can assemble resistors into higher-level assemblies, simplifying your procurement and manufacturing.

Custom Winding
Riedon's winding expertise is available to solve your custom component needs. We specialize in precision manufacturing using highly managed processes and quality systems. Call us for solutions to special components like resistance flow meter elements, specialized resistive or inductive sensors, coils for linear and rotary motion actuators, and similar wirewound devices.

Precision Compensation Resistors
Riedon's resistors are used for temperature-compensation in many instruments and transducers. These resistors are made with special wire that has the proper temperature coefficient to provide compensation for precision instruments.

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Visit Riedon Resistors On Slideshare!

Have you heard about SlideShare? Well its kind of like youtube but its for business PowerPoint presentations.

Visit Riedon page here and check out our uploaded PowerPoint presentation. We have two presentations, one on Wirewound technology and the other about what Riedon is all about.

Riedon’s UB Power Resistors Are Now Available At Digikey

UB series resistors offer same Mil-grade construction of our standard power resistors in small package, for applications needing to minimize board space. High grade materials utilized along with special construction techniques to enhance operating performance ensuring high power to dimension ratios. Resistors perform with excellent stability and environmental performance.

To Purchase contact Riedon , Digikey or any of our our Reps.

Looking for high temperture resistors and other passive components?

If you're looking for high temperature passive components for your high temperature applications, please check out our distributor, Tredsetter's website , for help or email them at hot@trendsetter.com to receive their complete guidebook.

Trendsetter sells High Temp Designer kits for $800.00 Plus S&H with 12 weeks delivery. Click here for Trendsetter website.

Resistors in LEDs

When I first attached a 280 ohm resistor in series with a 5mm red LED, the word on the street was that LEDs were low power, forever-lasting devices that would just about completely replace incandescent bulbs for simple binary indicators. LEDs spent a brief period as the numerical display device of choice too, until supplanted by the LCD. Regardless, the bottom line was that LEDs were really easy to work with. Just put that resistor in series - usually, you didn't even need to do the ohms law calculation - rules of thumb were good enough.
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Riedon is a major supplier to LED market.

Wirewound vs. Film Resistors for Precision Applications

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.)

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Riedon Wishes You A Prosperous New Year!

High Voltage Resistors

Riedon's high temperature resistors has been selected to be used on Vapor Stone Rail Systems, specifically on their passenger door development systems.

Why Choose Riedon For Your Special RTD Requirements

Riedon has manufactured high-precision wirewound resistors for OEM industries since 1960. These precision resistors have tolerances as small as 0.005%. They are extremely stable over time, and operate over wide operating temperatures.

Resistors this precise and stable require unusual design and manufacturing skills that absolutely manage the desirable properties of the resistor element wire, while minimizing undesirable characteristics that cause unpredictable errors and instabilities. These same design and manufacturing skills are as critical in RTDs as they are in precision resistors!

A Resistance Temperature Detector (RTD) is a resistor designed to measure temperature using the known resistance vs. temperature relationship of metals. An RTD element is the actual temperature-sensing unit. It is typically unprotected and offers only the element leads for terminations. An RTD probe is an assembly composed of an element, a sheath or tube to protect the element and provide a thermal path to the measurement, lead wires, and a termination or connection.

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Using Power Resistors as Heaters

Power resistors and resistance heaters share many common design considerations. In both products, good thermal design ensures low thermal resistance between the element and the exterior environment. Both must be rugged and reliable.

Power resistors are often used in heater applications. They allow a designer to apply and control heat to a small area. Riedon offers a broad range of these resistors. If one of our standard resistors won't do we can modify existing products or create new designs to fit your special requirements.

Riedon power resistors are used in a variety of heater applications. They are especially useful in situations where the heat must be isolated or concentrated in a small area.

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Current Sensing Resistors

Sudden current or voltage changes are often hazardous to electronic products. For example, transients or surges that reach microprocessor or memory components can destroy those expensive parts, and wipe out critical programming and data. Many electronic products now include surge protection circuits.

In these circuits, low value resistors sense when the current is too high so that measures can be taken upstream before the excess current causes damage. Wirewound resistors are a popular choice for these applications. They are inexpensive, available in low resistance values, have low temperature coefficients and good surge-handling capability. Riedon has served this application for years with their "LO OHM" power resistors.

Riedon’s SL resistors add an additional application advantage. We designed them for PC board surface mounting to satisfy the growing demand for new high density boards fabricated with automated pick-and-place equipment.

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A Praise For Riedon Resistors!

We received this email from a valued customer which we would like to share with you:

"....I have been a strong advocate of Riedon resistors here at PCI and you make it easy for me to continue to be.

Riedon presently manufactures a shunt resistor of my design (Riedon P/N: SP1669-0R0013N1). I can tell you that this resistor has performed flawlessly and we have enjoyed 100% reliability – zero failures in over 4000 units (millions of unit-hours of operation)! Please convey my sincere gratitude to your workforce! Their attention to detail is evident in the quality of the product we receive from Riedon. Thank you!"

~Performance Controls, Inc.

Distributors boost technical support offerings

Distributors are seizing this opportunity to showcase one of their core competencies: providing a one-stop shop for a variety of components and technologies. Even though the channel has cut personnel during the recession, distributors are retaining and even making select investments in applications engineers, Web tools, technical training seminars, and other types of design assistance. “Technical competence is going to be one of the major trends shaping the distribution channel as we move forward,” said Vallee.

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To find our techinical reps and distributors, click here.

How to design guide for precision resistors

Even in this digital age, a number of measurement and instrumentation applications rely on the accuracy of the value of one or more resistors. There are essentially three types of error source to be understood:

1. Measurement errors - which limit the precision with which the actual resistance value can be known.
2. Short-term change factors - reflecting uncertainty in the resistance value in a customer’s recently assembled PCB.
3. Long-term change factors - reflecting value drift throughout the product’s life.

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Riedon resistors is used in critical medical systems

Each year, more than 250,000 Americans die from sudden cardiac arrest. With recent technological advances, a portable lifesaving device called the automated external defibrillator has been invented. It is an important life saving device, and has saved many . Riedon sells resistors to some of the major defibrillator manufacturers.

Resistors are a critical part of this system. A stable and repeatable measurement of the charging voltage is a critical funtion of this circuit, as this determines the amount fo electrical energy delivered to the patient.

Check our wesite for more infromation: http://www.riedon.com/