How to select the patch resistor, what are the specifications and sizes of the patch resistor

Chip resistance, as a widely used component in the electronics industry, its selection is very important for the performance and stability of the circuit. This paper introduces the selection principle of the chip resistance, as well as the common specifications and sizes, to help the lower level to better understand and choose the chip resistance.

Chip resistance selection principle

Resistance value selection: First, determine the required resistance value according to the needs of the circuit design. The selection of resistance values should meet the voltage and current requirements in the circuit, while taking into account power consumption and heat issues. When selecting the resistance value, it is also necessary to pay attention to the precision of the resistance to ensure the stability and accuracy of the circuit.

Power consideration: The power level of the patch resistor indicates the maximum power consumption it can withstand. When selecting a resistor, ensure that its power level is higher than or equal to the maximum power that can be generated in the circuit to prevent the resistor from being damaged by overheating.

Size and package: The size and package type of the patch resistor are also important factors to consider when selecting. Different sizes and package types are available for different boards and assembly processes. When selecting, the appropriate size and package type should be selected according to the space and assembly requirements of the circuit board.

Temperature coefficient: The resistance value of the patch resistor will change with the change of temperature. Therefore, when selecting a resistor, it is necessary to consider its temperature coefficient. For circuits that require stable performance, a patch resistor with a smaller temperature coefficient should be selected.

Accuracy and stability: For applications that require high circuit performance, high-precision patch resistors need to be selected. At the same time, it is also necessary to consider the long-term stability of the resistance to ensure the long-term reliable operation of the circuit.

Noise and distortion: In some special applications, such as audio amplifiers, it is necessary to consider the noise and distortion performance of the resistor. The selection of low noise, low distortion chip resistance helps to improve the performance of the circuit.

Patch resistance specifications and dimensions

The specifications and sizes of the chip resistance are various, and the common ones are 0201, 0402, 0603, 0805, 1206, etc. These numbers represent the length and width of the resistance in inches. For example, 0402 means that the length of the resistor is 0.04 inches and the width is 0.02 inches. Different sizes of resistors have different power levels and resistance ranges, and should be selected according to actual needs.

Selection precautions

Understand circuit requirements: Before selection, it is necessary to fully understand the needs of the circuit, including voltage, current, power, accuracy, etc. This helps determine the required resistance value and power level of the resistor.

Consider space limitations: When choosing a patch resistor, you need to consider the space limitations of the board. Ensure that the size and package type of the resistance selected matches the board to avoid problems during assembly.

Consider the cost factor: under the premise of meeting the performance requirements, the cost of the patch resistance should be considered. Different brands, models and parameters of the chip resistor prices may vary greatly. By comparing the price and performance of different suppliers, you can choose the most cost-effective patch resistance.

Reference to industry standards and specifications: When selecting the patch resistor, you should refer to the relevant industry standards and specifications to ensure that the selected resistor meets the product requirements and industry standards. This helps improve circuit compatibility and reliability.

Perform actual testing and verification: In practical applications, the performance of the selected patch resistance should be tested and verified. This ensures that the selected resistor can meet performance requirements in the actual operating environment and detect potential problems in a timely manner.