Printed Circuit Board Assembly (PCA) refers to the process of soldering electronic components onto a printed circuit board (PCB). This service is usually provided by professional electronic manufacturing service providers (EMS), covering the entire process from component procurement, inspection, mounting to final testing and quality control. PCA services are widely used in the field of electronic product manufacturing, including multiple industries such as consumer electronics, communication equipment, medical instruments, automotive electronics, and aerospace.

　　In circuit board assembly services, common process flows include surface mount technology (SMT), through-hole insertion technology (THT), and hybrid assembly technology. SMT is suitable for the installation of high-density and miniaturized components, while THT is commonly used for the installation of large or heavy-duty components. Hybrid assembly technology is the combination of SMT and THT to meet the installation needs of different components.

　　In addition, circuit board assembly services also include functional testing and reliability testing to ensure that the assembled circuit board meets design requirements and performs well in practical applications. These tests include but are not limited to electrical testing, aging testing, vibration testing, and temperature cycling testing.