Is Schottky diode sealed with iron or plastic — SUNMATE

In normal work, some customers often ask such questions. The same is the Schottky diode TO-220 package. Why is there a difference between full plastic packaging and half plastic packaging (half plastic packaging is what we usually call the iron head)? What is the difference between them? Which one would be better?

We often refer to the use of plastic packaging or full plastic packaging, which means that the internal frame, chips, solder chips and other circuits of the Schottky diode are all enclosed in one package and isolated from the outside world. The material used is epoxy resin, which has excellent heat resistance, oxidation resistance, and insulation properties. We know that the application field is mostly in the high-frequency rectification process of power supplies, so the safety requirements are relatively high. It is necessary to have good insulation to avoid circuit short circuits and other faults. It is precisely in this way that using fully plastic packaging can effectively avoid internal circuit contact with the outside world, better protecting circuit safety.

In addition to the full plastic packaging for circuit safety, Schottky diodes have another packaging, that is, iron head packaging to solve the problem of heat dissipation. The difference between using iron head packaging and full plastic packaging. This packaging can greatly improve the effective heat dissipation efficiency of the power supply, and is very suitable for circuits with severe heat generation or high heat dissipation requirements.