Protection parameters and circuit fit
The SMAJ64A-13: Its 64 V reverse standoff voltage means the device stays transparent below that level — no leakage-induced power loss on the protected line. When a surge exceeds the 71.1 V minimum breakdown voltage, the diode starts conducting, clamping the transient to a maximum of 103 V while shunting up to 3.9 A of peak pulse current in the 10/1000 µs waveform. The 400 W peak pulse power rating defines the energy-handling capability for short-duration transients — a 64 V bus in industrial or telecom equipment sees repetitive surges from inductive load switching or lightning-coupled events, and this diode absorbs them without exceeding its thermal limit.
Package, mounting, and temperature range
Housed in a DO-214AC (SMA) package with surface-mount termination, the SMAJ64A-13 fits standard reflow profiles. The SMA footprint is common across TVS diodes in this power class — the same pad layout serves multiple voltage variants, so a BOM change from 64 V to a different standoff does not require a board spin. At the high end, the leakage current increases but the clamping voltage stays within the rated limit — the 150°C ceiling matches typical derating curves for 400 W TVS devices.