Surge rating and clamp voltage for 12V/24V automotive buses
The 1.5SMC170AHE3/57T: The 1500 W rating at the 10/1000 µs pulse defines the energy it absorbs in a single surge event — enough for load-dump and inductive kickback on an automotive 12 V system, where the alternator field decay can push the bus above 100 V for tens of milliseconds.
DO-214AB footprint and reflow handling
Housed in the DO-214AB (SMC) package, also designated as SMCJ, this surface-mount TVS uses a standard JEDEC footprint with a cathode band for unidirectional orientation. The single-channel Zener construction means it protects one rail per device — no bidirectional clamping, so polarity matters on the PCB layout. The SMC package has a body size roughly 7.1 mm × 6.0 mm, with a typical reflow profile per J-STD-020.