Standoff, breakdown, and clamping — the three numbers that size the clamp
The 1.5SMCJ43A_R1_00001: The reverse standoff of 43 V sets the continuous working voltage the diode sees in normal operation — above this the device begins to conduct and the clamp activates. Unidirectional polarity — current flows in one direction only. If the protected line sees bidirectional transients (AC rails, motor commutating spikes), a single 1.5SMCJ device covers only the positive half-cycle; a matched second device handles the negative, or the design moves to a bidirectional variant in the same series.
DO-214AB SMC package — SMT assembly and thermal pad considerations
Confirm pad geometry and solder mask tolerance with the Panjit landing pattern before committing to the layout. Tape-and-reel and cut-tape packaging are both listed — use reel quantities for high-volume assembly and cut tape for prototyping runs or low-count BOMs.
The product status is listed as Active.