表面贴装合金电阻器的主流封装选择是什么？

As an indispensable component in modern electronic devices, surface mount alloy resistors have the characteristics of high precision, small size, and stability. Their mainstream packaging forms are diverse. The following is a detailed introduction for you:
0201 Package: The size is 0.6mm × 0.3mm. This package is compact in size, lightweight, and suitable for high-density circuit board designs that require extremely high space. However, due to its extremely small size and relatively weak heat dissipation capacity, it can withstand low power, typically 1/20W or 1/16W. It is commonly used in some miniaturized, high-performance electronic devices such as smartphones, tablets, etc.
0402 package: The size is 1.0mm × 0.5mm, slightly larger than 0201 package, with improved heat dissipation conditions. The power is generally 1/16W or 1/10W. This package can meet the needs of most conventional applications while ensuring certain performance, and is widely used in various fields such as consumer electronics and communication equipment.
0603 package: The size is 1.6mm × 0.8mm, which is one of the standard sizes in surface mount resistors. Its maximum power is usually 1/8 watt, with a capacity range of 1 ohm to 1 megaohm, and a voltage level of up to 200 volts. It has the advantages of being compact, lightweight, and cost-effective, and is suitable for electronic devices such as mobile devices, laptops, communication devices, digital cameras, etc.
0805 package: with a length of 2.0mm and a width of 1.25mm, the power is usually 1/8W or 1/4W. This package achieves a good balance between electrical performance and heat dissipation performance, meeting certain power requirements without occupying too much circuit board space. Its working temperature range is wide, and its electrical specifications such as sensitivity, withstand voltage, and insulation impedance also perform well. It is suitable for PD fast charging, lithium battery protection, power tools, air conditioners, and various household appliances.
1206 package: The size is 3.2mm × 1.6mm, and the power is generally 1/4W or 1/3W. It has good heat dissipation performance and high power tolerance, and can work stably in harsh environments. In scenarios such as fast charging chargers, mobile power banks, computers, power management systems, etc., alloy resistors packaged in 1206 are widely used, mainly for current detection at USB-C output terminals and battery terminals.
1210 package: The size is 3.2mm × 2.5mm, and the power is commonly 1/3W or 1/2W. Compared with the 0805 package, it can withstand higher power and is suitable for circuits with slightly higher power requirements, such as some industrial control equipment, automotive electronics, and other scenarios.
2010 Package: The size is 5.0mm × 2.5mm, and the power is usually 3/4W. This package is suitable for circuits that require high power, such as new energy batteries, lithium battery protection, and other scenarios, and can provide stable current detection and sampling functions for the circuit.
2512 package: The size is 6.4mm × 3.2mm, and the power is generally 1W or above. This type of packaging has a larger size, a larger heat dissipation area, and can withstand higher power, making it suitable for applications that require higher power, such as new energy batteries, new national standard electric vehicles, and power tools.
In summary, the mainstream packaging of surface mount alloy resistors covers various types from small to large sizes, and different packaging is suitable for different application scenarios. Users can choose the appropriate packaging form based on factors such as circuit board design requirements, space limitations, power requirements, and working environment.