What this 2 A, 200 V fast-recovery diode does in your power stage
The STTH2R02AY is a 2 A, 200 V standard-recovery diode in a DO-214AC (SMA) surface-mount package, built on ST's fast-recovery epitaxial process. The 1.04 V forward drop at 2 A is typical for this voltage class — not the lowest Vf on the market, but the trr is the spec that matters for a hard-switched converter.
Automotive-grade pedigree and junction temperature
The ECOPACK2 label confirms the device is halogen-free and RoHS-compliant per ST's green-molding compound.
The DO-214AC body is the same pad layout as the standard SMB/SMC diodes but with a lower profile — reflow profile per JEDEC MSL level 1 (no bake required if the bag seal is intact). The cathode band is marked on the body; verify orientation before pick-and-place because a reversed diode in an automotive ECU means a failed board-level test.