400 W peak pulse in a DO-214AC footprint
The SMAJ120CA-13: The 120 V standoff means the device does not conduct at the nominal 120 V DC bus or 120 V AC peak — it only clamps when the transient pushes the line above the 133 V minimum breakdown threshold. That 133 V to 193 V clamping window absorbs the surge energy before it reaches the protected load.
Housed in the standard DO-214AC (SMA) surface-mount package, the SMAJ120CA-13 occupies a compact footprint suitable for high-density PCB layouts. The SMA supplier device package designation matches the industry-standard SMA outline, so the land pattern and solder stencil aperture are well-documented across assembly houses. The wide thermal margin means derating for ambient heat is straightforward — the 400 W rating holds at 25°C and derates linearly above that.
The base product number SMAJ120 covers both unidirectional and bidirectional variants; the CA suffix specifically denotes the bidirectional configuration. When ordering, confirm the exact ordering code SMAJ120CA-13 to ensure the bidirectional channel and Tape & Reel packaging.