The Infineon ICE3B3065P is an IC OFFLINE SWITCH, a monolithic controller with an integrated power MOSFET designed for flyback converter topologies in AC-DC power supplies. It is typically used in applications such as chargers, adapters, and auxiliary power supplies where a compact, isolated, and regulated output is needed from a mains input.
This is a key distinction for the BOM: through-hole parts require different handling, insertion, and soldering processes compared to SMD parts. If your assembly line is set up for surface-mount only, verify that the through-hole process can be accommodated, or check whether a surface-mount variant of this CoolSET™ family exists for your design.
This makes it a safe choice for both prototyping and volume production without immediate obsolescence risk.