Clamping voltage and automotive qualification
The SMAJ58AQ-13-F: Its 58V reverse standoff voltage (V_RWM) means the device does not conduct below that rail level; it starts clamping at 64.4V minimum breakdown and holds the surge to 93.6V maximum at 4.3A peak pulse current. For a 48V nominal automotive bus with transients reaching 90V, this keeps the protected node inside a 100V-rated component's safe operating area. The -55°C to +150°C junction temperature range covers under-hood and engine-bay thermal profiles — the 150°C upper limit gives margin for self-heating during repetitive surge events.
Package and board-level integration
Housed in the DO-214AC (SMA) package — a standard surface-mount footprint shared across the SMAJ family. The supplier device package is SMA, which mates directly with the DO-214AC land pattern. For a 400W TVS, the SMA body's copper pad area under the cathode tab sets the thermal resistance to the board; a 1 oz copper pour of at least 30 mm² per terminal keeps the junction temperature rise within the 150°C limit during a 10/1000µs pulse.