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While LEDs are mostly driven by current sources, there are also several applications where constant voltage drivers are used. In that case current limiting resistors are mandatory. But that raises the question which resistor is the right one to guarantee reliable and accurate control while not compromising efficiency. Not all resistors are the same and growth in markets like high-power LED lighting is serving to highlight the importance of understanding all aspects of an application in order to correctly and safely specify th...
Date：2019-09-06 [More+]
Resistors, as main passive components are widely used in all applications required electricity, including air conditioner. The heater blower motor reduces or increases the amount of air blowing through the dashboard vents based on the fan speed selected or, in an automatic climate control system, the interior temperature and other factors. But resistors, small electronic parts tucked out of sight, are what actually control the fan speed by reducing the amount of electrical current going to the blower motor. When everything is...
Date：2019-09-03 [More+]
Many suppliers (OEMs) were asked by the car manufacturers to build and certify their quality management system according to the rules and regulations of their own country organizations, such as: VDA (Germany), AIAG (North America), AVSQ (Italy), FIEV (France), SMMT (UK). But due to this regulation a supplier needed to provide two different certificates for Daimler and Chrysler (VDA 6.1 for Germany and QS 9000 America), even though the supplier delivered only to a single company. These complexities accelerated the need for har...
Date：2019-09-03 [More+]
End of line resistors (EOLR) are resistors, of a known value, that are used to terminate protective loops or zones, such as those found in ESD or FG systems. Microhm Electronics metal foil resistor PMRY series can be used as end of line resistors. The purpose of EOLRs is to allow the control panel to supervise the field wiring for open or short circuit conditions. How the control system responds to each depends on the systems configuration, but generally speaking, a control system views an open circuit as a fault or alarm con...
Date：2019-08-30 [More+]
The resistor manufacturer selects and combines chips of the appropriate resistance values in hermetic or non-hermetic packages. Trimmed and/or matched, individual chip-resistor assemblies reside in a plastic or hermetic enclosure. These devices allow for resistance variation from circuit to circuit without the non-recurring engineering cost (NRE) of specialized networks. When using foil chips, its important to keep in mind that all foil resistors have very low absolute TCR. The TCR of Microhm Electronics metal foil resistors ...
Date：2019-08-29 [More+]
For applications that require high reliability, the resistor production process includes MIL-style testing consisting of electrical and environmental stresses to screen out and identify any parts or lots that exhibit performance variations. The level of testing needed depends on how critical the circuit is to the overall objective of the project. Microhm Electronics metal film resistor EE series meeting standard MIL-R-10509 are widely used in precision instruments. Parts testing may vary depending on the specifications requir...
Date：2019-08-29 [More+]
Metal film resistors are axial resistors with a thin metal film as resistive element. The thin film is deposited on usually a ceramic body. They are amongst the most common types of axial resistors. Other film type resistors are carbon film and thick and thin film resistors. In most literature referrals to metal film, usually it is a cylindrical axial resistor. However, thin film chip resistors use the same manufacturing principle for the metal layer. HPMRY series and PMRY series are among the most popular metal film resistor...
Date：2019-08-27 [More+]
Ever-evolving automotive technology is no longer confined to the basic vehicle functions of propulsion, steering, and braking. It is now expanding into a variety of disciplines. Remarkable advances in automotive technology, most notably in areas such as telematics, advanced safety features, and environmental compatibility, have led to tremendous evolution in our vehicles and our automotive society since the days when vehicles were merely a means of getting around. This evolution has been facilitated by electronic components, ...
Date：2019-08-21 [More+]
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