It is designed for general-purpose surge protection on a 28V nominal rail, clamping transients to 45.4V at the rated 11A peak pulse current (10/1000µs waveform). The 500W peak pulse power rating defines the energy it can absorb in a single surge event — enough for industrial control I/O, telecom line cards, and automotive 24V battery-fed loads where the transient energy is moderate and repetitive strike count is low. The DO-214AC (SMA) package is a low-profile surface-mount footprint that reflows on standard 0.063-inch FR-4 with a 2 oz copper pad. The junction operates from -65°C to 150°C, so it survives under-hood thermal cycling and outdoor enclosure heat without derating the standoff voltage.
The minimum breakdown voltage is 31.1V, meaning the device starts conducting avalanche current above that level. A 28V rail with 5% tolerance sits at 29.4V max — still below the breakdown threshold, so the TVS does not leak during normal operation. At the full 11A peak pulse current, the clamping voltage reaches 45.4V. Any downstream component rated below 45V — say a 40V DC-DC converter input — would see overstress during a surge. The margin between the rail and the clamp is the design headroom.
Active production — no EOL concern on the horizon
The base product number SMAJ28 covers the entire voltage variant family, so the supply chain is stable across multiple standoff options.