The SMAJ5.0A-13 is a 400 W unidirectional TVS diode from Diodes Incorporated, housed in the standard DO-214AC (SMA) surface-mount package. With a 5 V reverse standoff voltage and a 6.4 V minimum breakdown voltage, it clamps transients to 9.2 V maximum at the 43.5 A peak pulse current (10/1000 µs waveform). The 400 W rating means it can absorb a single 10/1000 µs surge up to that power level without failing — a common benchmark for protecting 5 V logic, data lines, and low-voltage supply rails in general-purpose equipment.
DO-214AC footprint and board integration
The DO-214AC (SMA) package with the supplier device package code SMA is a compact two-terminal footprint common for TVS diodes in this power class. The surface-mount body sits low on the PCB, and the copper pad area under the cathode tab sets the thermal impedance — a larger pad improves heat spreading during repetitive surge events. The -55°C to 150°C junction temperature range covers industrial and outdoor enclosures where ambient temperatures swing widely.