Base Electronics: Resistors Configuration

Base Electronics: Resistors Configuration

http://dev.emcelettronica.com/print/52311

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Base Electronics: Resistors Configuration By arag61 Created 01/24/2009 - 11:44

Technology electronics Resistor Here following we will discuss about their classification according to the configuration and in another article we will discuss their classification according to application and colours code. Classification according to the configuration Resistors can be classified, according to the used configuration, in the following categories: Chip resistors: They are generally standard, passive components that are helpful for derating voltage and current controlling and they are used in integrated circuits (IC) to allow an high integration. A thin film technology is used for their manufacturing and their composition can be made from different materials : a powdered carbon and a resin binder is used for the carbon composition ones, ceramic and metallic materials for the cermet ones. Chip resistors like metal alloy, metal foil, metal film, tantalum and wirewound can be also found in the market. Lately the demand for high precision chip resistors has increased, especially for the ones with low resistance and small temperature coefficient of resistance. Another configuration is the array one: a resistor chip array includes many resistors in a single package.

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25/01/2009 9.32

Base Electronics: Resistors Configuration

http://dev.emcelettronica.com/print/52311

Pictures courtesy of Vishay Electronic Company Resistor - Capacitor (RC) networks: They are integrated circuits that include, in a single chip, resistor - capacitor arrays. Four basic technologies are used for their manufacturing : wirewound, thin film, metal film and thick film. While the wirewound RC networks are simple, in fact they are often wound by hand, the other ones are more complex. In the thin film technology, for example, a thin layer of semiconductor or magnetic material is deposited over a ceramic, metal or semiconductor base. This technology is preferred in the applications that require low noise levels, good stability and high class performances at very high frequencies. The metal film technology is used in simple circuit, the thick film one is used for its good reliability, low cost, low weight and circuits miniaturization. The RC networks specification parameters include the power rating, the capacitance, the temperature coefficient, the resistance and the resistance tolerance that is the percentage deviation from a nominal resistance value. The RC networks are generally used to eliminate the electromagnetic interference and radio frequency interference at the I/O ports of a PC and its peripherals, workstations etc.

RC network - Picture courtesy of RCD Resistor-Capacitor- Diode (RCD) networks: They are built on silicon substrates using the thin film technology that allows a very good performances at high frequencies. They are excellent for high speed- frequency data and communication applications, supplying very good performances, reducing significantly cost and space. The integrated RC networks, at higher frequencies, are better than standard RC networks for reliability, for mechanical and electrical performances and stability. Current Sensing Resistors (CSR): They transform the current flowing through them in a voltage fall. Measuring this voltage fall allows the current through the resistor to be measured. The construction materials and the configuration styles are parameters that must be considered for their realization. Materials comprise carbon film, carbon 2 di 3

25/01/2009 9.32

Base Electronics: Resistors Configuration

http://dev.emcelettronica.com/print/52311

composition, metal film, metal alloy, ceramic composition, thin film, thick film and wirewound. About the configuration styles we must consider the single resistor, the resistors network and the resistor chip array. The CSR specification parameters include: the resistance range measured in Ohm, the power rating that is the maximum power level that a CSR supports, the tolerance specified as percentage, the continuous operating voltage measured in volts, the operating temperature, the temperature coefficient parameter that measures the rate at which the nominal resistance value changes as a temperature function, the terminal numbers.

Current sensing resistors - Courtesy of CTS Trademarks

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