Peak pulse power and clamping — what the numbers mean for your rail
The 1.5SMCJ120AS_R1_00001: At that surge current (7.9 A peak,), the clamping voltage sits at 193 V maximum, which is the ceiling the protected rail sees during the event. The reverse standoff of 120 V nominal sets the continuous working voltage below which the TVS conducts no current — the protected rail runs below this and the diode is invisible in normal operation. The minimum breakdown of 133 V gives you the margin between standoff and conduction onset.
Package, temperature grade, and field-replaceability
The DO-214AB (SMC) package is the standard surface-mount footprint for 1.5 kW TVS diodes — the cathode bar in the package marking identifies the polarity band, which is the only orientation concern. Supplied in Tape & Reel and Cut Tape; the Cut Tape option is useful for first prototypes or low-volume rework where you want one part at a time without a reel handler.
For new designs this clears the single-source risk flag, and for existing builds the part remains in the regular production schedule.