22 V rail clamp with a 500 W pulse rating
Its 24.4 V minimum breakdown voltage and 39.4 V maximum clamping at 12.7 A peak pulse define the protection window — the rail rides at 22 V, and the diode starts conducting at 24.4 V, holding the clamp below 40 V during a 500 W pulse.
Voltage ratings and pulse handling
The 24.4 V breakdown is the threshold where avalanche begins; at that point the diode starts shunting current. The 39.4 V clamp at 12.7 A peak pulse is the worst-case voltage the protected circuit sees during a 10/1000 µs surge.
Rated for junction temperatures from -65°C to 150°C, this part covers outdoor telecom enclosures, industrial control cabinets, and under-hood automotive auxiliary circuits — anywhere a 22 V rail needs transient protection across a wide thermal swing.
The SMA footprint is a standard two-pad layout; the cathode band identifies the unidirectional orientation.