What are the conventional volumes and powers of current limiting resistors?

The rated power of current limiting resistors can vary depending on their packaging size and application scenarios. Here are some common chip resistor package sizes and their corresponding rated power:

-0201 Package: 1/20W
-0402 Package: 1/16W
-0603 Package: 1/10W
-0805 Package: 1/8W
-1206 Package: 1/4W
-1210 package: 1/2W
-1812 package: 1/2W
-2010 Package: 3/4W
-2512 package: 1W
The power of these packages is only the current limiting parameters of conventional resistors, such as high power, high voltage, surge protection, sulfur resistance, and thin film resistors, all of which have certain differences in parameters.

When selecting a current limiting resistor, it is usually designed and used with a 70% derating of the rated power to ensure that the resistor will not be reduced in reliability or damaged due to overheating. At the same time, it cannot exceed its maximum operating voltage, otherwise there is a risk of breakdown. Generally, it is designed and used with a 75% derating of the maximum operating voltage. When the ambient temperature exceeds 70 ° C, it must be used in accordance with the derating curve. Therefore, the rated power selection of the current limiting resistor should be determined based on the actual current, voltage, and environmental conditions in the circuit to ensure that the resistor can operate within a safe power range.