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In a film resistor, the resistive material is a very thin coating of carbon ,metal or metal oxide on an insulating substrate, such as ceramic or glass. The value of the resistance is determined by the thickness of the film and the amount of carbon or metal in it. These resistors are available with very accurate and stable values. Apart from shunt resistor, surface-mount resistors are almost always film resistors. These resistors have no leads at all, so LS is very low. The film is deposited on a ceramic sheet. Because of the...
Date：2019-05-15 [More+]
Resistors are passive component applicable to various applications, for instance, smartphones, CPU power supplies and LCD projectors. To achieve power management performance of portal devices, high precision measurement of current is required. To measure the circuit current in general, first you insert current sense resistors in serial into a circuit then measure each voltage of both ends of the resistor. Like smartphones, however, when the current gap happens to be more than a hundred times between standby and operating APs,...
Date：2019-05-14 [More+]
Power resistor market are focusing on developing power resistors that dissipate huge amount of power, while keeping their size as small as possible. In an electric circuit, power resistors endure and distribute a huge amount of power. This power dissipation by a power resistor results in accelerated increase in temperature, after which the power resistor starts dissipating power through the circuit board and the surrounding atmosphere. In order to minimize this kind of dissipation and the consequential hazardous failure condi...
Date：2019-05-14 [More+]
The metal film resistors are more preferred over carbon composition resistors because the metal film resistors generate less noise than the carbon composition resistors. While the metal film resistors have low tolerance value than the carbon composition resistors. In metal film resistor, the desired resistance value can be achieved by either trimming the thickness of metal layer or by cutting the metal film in a helical manner along its length. This is generally done by using the lasers. Once the desired resistance value is o...
Date：2019-05-13 [More+]
Resistors are available in a large amount of different packages. Nowadays the most used are the rectangular surface mount resistors, which mainly consist of thin film resistors and thick film resistors. Thin film resistors and thick film resistors are characterized by a resistive layer on a ceramic base. Although their appearance might be very similar, their properties and manufacturing process are very different. The naming originates from the different layer thicknesses. Thin film has a thickness in the order of 0.1 microme...
Date：2019-05-10 [More+]
Thick film resistors and thin film resistor , the most common types in the market, are characterized by a resistive layer on a ceramic base. Thick film resistor started to gain popularity In the 1970s. Today, these are by far the most used resistors in electrical and electronic devices. They come usually as chip resistor (SMD), and have the lowest cost compared to any other technology. The temperature coefficient of thick film resistor typically ranges from 50 ppm to 200 ppm/K. Tolerances are between 1% and 5%. Because costs ...
Date：2019-05-10 [More+]
Wire wound resistors are the oldest type of resistors that are still manufactured today. They can be produced very accurate, and have excellent properties for low resistance values and high power ratings. A wire wound resistor is a resistor where a wire with a high resistivity is wrapped around an insulating core to provide the resistance. A wire wound resistor is an electrical passive component that limits current. The resistive element exists out of an insulated metallic wire that is winded around a core of non-conductive m...
Date：2019-05-09 [More+]
When current is applied to a resistor, voltage drops at both end of the resistor according to Ohms law. You will get the current value applied to the resistor when you divide the voltage by resistance value. When you adjust the resistance large to make voltage drop large, heating of the resistor would be an issue. To avoid this, current sense should be achieved by using small resistance as possible. When the voltage drop is small, the voltage should be amplified by amplifying circuit. The purposes of current sense in a circu...
Date：2019-05-09 [More+]
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