1500 W peak pulse — the clamping event that matters
The 1.5SMC22A R7G: That 1.5 kW rating is the device's ability to absorb a transient without failing — it is the headline spec for any TVS selection. At the 18.8 V reverse standoff voltage (VRWM), the diode is effectively off and draws negligible leakage. When a transient exceeds the 20.9 V minimum breakdown voltage, it clamps the surge to a maximum of 30.6 V at the rated 51 A peak pulse current (Ipp). The margin between the protected rail's normal operating voltage and the 18.8 V standoff is the design headroom.
Package and board-fit for the DO-214AB footprint
The supplier device package is DO-214AB (SMC), so the land pattern is the same for any sibling in the family — a BOM change between voltage variants does not require a board spin. The wide Tj window means the leakage and clamping characteristics stay within spec across the full temperature sweep of a typical power supply or I/O line.
Active production — sourcing posture for this TVS
The Tape & Reel packaging (R7G suffix) suits automated pick-and-place assembly.