400 W peak pulse — the clamping budget for signal-line protection
The SMAJ22A-13-F: The 22 V reverse standoff voltage means the protected rail can run at 22 V DC without the diode conducting leakage; breakdown starts at 24.4 V minimum, so the device stays off during normal operation and only shunts overvoltage events. The DO-214AC (SMA) package is a standard surface-mount footprint for reflow assembly.
Active production — no last-time-buy pressure
Diodes Incorporated lists the SMAJ22A-13-F as Active.