The 1.5SMC200A_R1_00001: When the transient hits, the diode clamps at 274V maximum (at 5.5A peak pulse current), shunting the surge before it reaches the downstream silicon. The 274V clamp ceiling keeps the voltage stress below the typical 300V rating of power MOSFETs and DC-DC converters on that bus.
Package and reflow profile
Housed in a DO-214AB (SMC) package, surface-mount, with the cathode band marked on the body. The SMC footprint is larger than the smaller SMA/SMB variants — it dissipates the 1500W pulse without lifting pads on a standard 2-oz copper board. The tape-and-reel or cut-tape option suits both prototyping and volume reflow; the part's MSL rating is not listed, but a 260°C peak reflow profile is typical for this package class.
At the 150°C upper end, the peak pulse power derates linearly; the 1500W rating applies at 25°C ambient, so for a 105°C ambient environment the derating curve in the datasheet should be applied to the surge budget.