Classification and model of resistors
Time:2023-04-21
Views:985
With the continuous development of electronic technology, resistors are also constantly developing and improving, and the variety is increasing day by day. General resistors can be classified based on the material of the resistor body or the purpose of the resistor.
Resistors can be divided into three types based on the materials used in the resistor body: alloy type, thin film type, and synthetic type.
Alloy type resistors refer to resistors made by pulling or rolling a block like resistance alloy into a resistance wire or a resistance alloy foil, including wire wound resistors made of alloy wire and block metal film resistors made of alloy foil, both of which have excellent performance as block like metals.
Thin film resistors are made by depositing a layer of resistive thin film on a glass or ceramic substrate using different process methods, with a thickness ranging from tens of angstroms to several micrometers. Including thermal decomposition carbon film CF, metal film MF, gold oxide film MO and other varieties.
The resistor body of synthetic resistors is a mechanical mixture of conductive particles and organic (or inorganic) binders, which can be made into two forms: thin film and solid core, such as synthetic carbon film, synthetic solid core, and metal glass glazed resistors.
The resistance bodies of film type and synthetic type resistors are not made of whole block materials, and their conductive materials have a dispersed structure inside, and their electrical properties are different from those of block structure materials. Traditionally, these two types of resistors are collectively referred to as non wire wound resistors.
Resistors can be classified into the following types based on their purpose
(1) Universal resistors can meet the requirements of general electronic technology. Its rated power ranges from 0.05-2 watts, with a few ranging from 5-10 watts. The nominal resistance range is from 1 ohm to 22M ohm, with allowable deviations of 2%, 5%, and 10%.
(2) Precision resistors have high accuracy and stability, with a rated power generally not exceeding 2 watts, a nominal resistance value ranging from 0.01 ohms to 20M ohms, and an allowable deviation range of 2% to 0.001%.
(3) High frequency resistors are mainly thin film resistors, suitable for high-frequency circuits and used as matching impedances, attenuators, equivalent loads, etc. The resistance value is generally small, not exceeding 1K Ω, with a wide power range of up to 100 watts. By using circulating water cooling and evaporative cooling, it can reach up to 50K watts or higher.
(3) High frequency resistors are mainly thin film resistors, suitable for high-frequency circuits and used as matching impedances, attenuators, equivalent loads, etc. The resistance value is generally small, not exceeding 1K Ω, with a wide power range of up to 100 watts. By using circulating water cooling and evaporative cooling, it can reach up to 50K watts or higher.
(4) High voltage resistors are used as voltage dividers and discharge resistors in high-voltage devices, measuring equipment, and televisions. The structural characteristics are slender, with a rated power range of 0.5-15 watts, a working voltage of up to 35 dry volts or higher, and a nominal resistance value of up to 1000 megaohms.
(5) The resistance value of a high resistance resistor is above 10 megohms, with a maximum of 10 to the 12th ohm and even up to 10 to the 14th ohm, used in measuring instruments. The dissipated power is generally very small.
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