Resistor Technology Comparison

Last Updated on Tuesday, 10 January 2012 03:31 Written by riedon Friday, 13 January 2012 10:50

Riedon Introduces 3 New Products In Our Resistor Offering

Last Updated on Tuesday, 10 January 2012 10:13 Written by Frieda Monday, 11 July 2011 09:25

1) HIGH PULSE CHIP Riedon is well known for creating high quality joule rated wirewound resistors capable of handling instantaneous pulses of power. We are now extending this capability to our new PCR series, which is a pulse withstanding chip resistor able to withstand up to 4000W for 0.1ms. Compared to other competitors this rating is much higher. For more information on this resistor please click http://www.riedon.com/us/images/stories/pdf/PCR.pdf

2)ULTRA LOW OHM CHIP In addition to the PCR series Riedon would like to introduce the CSR series, an Ultra-Low Ohm (Metal Strip) Chip Resistor. We are introducing this to meet the increasing demand in the market for low ohm surface mount shunts. This type of device is used across many industries and applications including DC/DC converters, chargers, or adaptors, and power management for battery charging. For more information on this resistor please click http://www.riedon.com/us/images/stories/pdf/CSR.pdf

3) HIGH VOLTAGE MELF During the continued success of our precision metal electrode leadless face resistors, the MFM series, Riedon has found the need for a MELF that can withstand high voltages. In order to meet this requirement we would like to introduce the MFM series, a high voltage MELF resists that is able to withstand an operating voltage up to 3000V. This is nearly 9X higher than the MFM series, which can withstand up to 350V. To find out more information about this resistors please click here http://www.riedon.com/us/images/stories/pdf/MGM.pdf

Why Buy Matched Set Resistors?

Last Updated on Friday, 18 March 2011 12:09 Written by Frieda Wednesday, 16 March 2011 04:11

Matched resistors are a set of resistors where an additional parameter(s) is given to link the resistors. For example, resistor ‘A’ and resistor ‘B’ have

matched resistors

a resistance of 100Ω, a tolerance of 5%, and a TCR of 25 + 5 ppm. You may add additional parameters to this set calling for the pair to be no more than 1% apart and also within 5ppm of each other. If resistor ‘A’ is 95Ω and resistor ‘B’ is 105Ω, both of which are within their individual tolerances, then these resistors would not be matched since they deviate more than 1% in comparison to each other. Conversely if resistor ‘A’ has a ppm of 20 while resistor ‘B’ has a ppm of 25, then the TCR of these resistors would be matched since they meet the requirement of being no more than 5ppm apart from each other. It is important to consider TCR as well due to the variation in resistance as the components heat up, which may flaw your design. This is not limited to only a pair of resistors and can be applied to as many as your application needs.

There are applications

where choosing matched resistors is sometimes necessary and advantageous financially. Take for example a simple voltage divider. If precision in the output voltage is important in your design then choosing a set of matched resistors is crucial. You may be wondering why you wouldn’t select some precision resistors for your design instead and you wouldn’t be wrong in assuming so. However in applications where the ratio of the resistors is more important thanthe precision of the resistors, it would cost less to purchase a set of resistors with a tolerance of 1% matched to 0.1% than to produce a set of resistors with a tolerance of 0.1%.

Some industries of interest are oil and gas in their use of down-hole instruments and various military applications and scale instrumentation. If you are unsure whether or not you are able to apply matched resistors in your application, please do not hesitate to ask Riedon. With over x years of experience in producing custom resistors, we are confident in our ability to assist you in your design