The SMAJ43A-13-F: Rated at 400 W peak pulse power for the 10/1000 µs double-exponential waveform, this diode absorbs surges up to that energy level without failure. For a 43 V bus — common in telecom and industrial 48 V systems after a DC-DC converter — the clamping voltage of 69.4 V leaves margin below the typical 80 V abs-max of downstream switching regulators. The 5.7 A peak current is the current the diode shunts; the upstream fuse or PTC must open before the diode's thermal limit is reached under sustained overload.
Package and board-fit — DO-214AC SMA
Housed in the DO-214AC (SMA) package with the supplier device package designation SMA, this diode is a surface-mount device suited for standard reflow soldering. The SMA footprint is a common industry standard; the same pad layout accepts TVS diodes from multiple manufacturers, simplifying second-sourcing.
The operating junction temperature range spans -55°C to 150°C. The wide range also means the diode's leakage current at high temperature — a concern for battery-powered equipment — is bounded by the datasheet's high-temperature reverse leakage spec, though that figure is not listed here.
Active production — no end-of-life urgency
Diodes Incorporated lists the SMAJ43A-13-F as Active.