Component packaging is primarily categorized into two types: DIP (Dual In-line Package) and SMD (Surface Mount Device). From a structural perspective, packaging technology evolved from the earliest transistor TO packages (e.g., TO-89, TO-92) to Dual In-line Packages; subsequently, seven additional packaging forms were developed:
1. **SOP/SOIC** — Small Outline Package / Small Outline Integrated Circuit Package
2. **SOJ** — Small Outline Package with J-shaped Leads
3. **TSOP** — Thin Small Outline Package
4. **VSOP** — Very Small Outline Package
5. **SSOP** — Shrink Small Outline Package
6. **TSSOP** — Thin Shrink Small Outline Package
7. **SOT** — Small Outline Transistor (for diodes and transistors)
8. **DIP** — Dual In-line Package (Dual In-line Component)