What the peak-pulse and clamping ratings mean
The 1.5SMCJ58AS_R1_00001: The 1500W peak pulse rating (10/1000 µs wave shape) tells you the diode survives a single transient surge event at the listed energy — the 16 A peak pulse current flows at the clamping voltage of 93.6 V, so the two specs are linked: 93.6 V × 16 A ≈ 1500 W. In a 24 V rail protection circuit, this part clamps the spike at 93.6 V before it reaches the downstream load, well below the 64.4 V breakdown threshold the zener structure first begins to conduct at. The reverse standoff voltage of 58 V is the DC working voltage the TVS sees in normal operation — the diode is reverse-biased at standby and contributes no significant leakage until the surge pushes the rail above 58 V. That 58 V standoff sits comfortably below the 64.4 V minimum breakdown, giving roughly 6.4 V of headroom before the clamping action starts.
Package and thermal environment
Tape-and-reel packaging is listed for high-volume SMT production; cut tape serves prototype or small-batch rework. The supplier device package field confirms the SMC (DO-214AB) footprint is the board-side form factor, not a sub-variant.