Resistor
Resistor
Resistor
Traditional pin resistors and chip resistors, varistor, and thermistor.
DETAIL
Resistors are common components in electronic circuits. Actual resistors can be made of many different materials, including thin films, cement, or high-resistance nickel-chromium alloys (resistance wires). Resistors can also be integrated into integrated circuits, especially analog ICs, or into hybrid collective circuits or printed circuits.
The function of a resistor can be expressed by its resistance. The resistance range of commonly used resistors exceeds 9 orders of magnitude. Resistor resistance has a certain error range. When using resistors in electronic circuits, you need to consider whether the allowable error of the resistor is consistent with the application. If it is some precision circuits, you may also need to consider the temperature coefficient of the resistor. Resistors are also marked with their maximum power, which needs to be greater than the resistor's expected energy dissipation in the circuit, especially in power electronics applications. High-power resistors generally require heat sinks. In high-voltage circuits, the maximum voltage that the resistor can withstand also needs to be considered. There is generally no lower limit for the working voltage of the resistor. However, if the voltage of the resistor exceeds its maximum voltage, the resistor may burn when the current flows.
In addition to resistance, actual resistors also have series stray inductance L_PARAZ and parallel stray capacitance C_PARAZ. Actual resistors have series stray inductance and parallel stray capacitance. These specifications are very important in high frequency applications. In the application of low noise amplifier or preamplifier, the noise of the resistor also needs to be considered. A resistor's stray inductance, noise, and temperature coefficient are all related to the technology used by the resistor manufacturer. Generally, a series of resistors produced by a manufacturer will use a specific technology, and the technology used will not be labeled for individual resistors. A series of resistors may also be distinguished by their form factor, which is the size of the part and the location of the pins or terminals, which need to be taken into account when routing the actual circuit board.