What the 200 V standoff and 324 V clamp mean on the bench
The SMAJ200CA-13-F: When that happens, the device clamps the transient to 324 V maximum at the rated 1.2 A peak pulse current, shunting the energy away from the protected load. That rating tells you the device can absorb a 400 W pulse for that duration without failing, but the real-world margin depends on the actual pulse width and duty cycle. For shorter transients (like ESD or lightning per IEC 61000-4-5), the peak power capability is higher.
Housed in the DO-214AC (SMA) package, the SMAJ200CA-13-F is a surface-mount device with a standard footprint that reflows on a typical 2-layer board. The SMA package is one of the most common TVS diode packages — you will find it on countless protection designs, and the pad layout is shared with other SMAJ series parts. The Tape & Reel packaging means it feeds into a pick-and-place machine without a reel change.