The LT6650HS5#TRMPBF comes in a TSOT-23-5 package — that's the thin SOT-23-5. It's a surface-mount part.
The LT6650HS5#TRMPBF is listed as an Active part — no end-of-life notice, no last-time-buy risk. It's ROHS3 compliant. This is a current-production part you can specify into new designs without worrying about a short procurement window. For dual-sourcing or a tighter-tolerance alternative, the ADR280ARTZ-REEL7 offers 0.4% tolerance but only goes to 85°C; the ADR293GRZ-REEL7 matches the 125°C rating with 0.2% tolerance but outputs 5V. Neither is a pin-for-pin drop-in — check the pinout and output voltage before substituting.