What the 90V standoff and 146V clamping mean for your protection circuit
The 1.5SMCJ90A_R1_00001: This rating is the load-line anchor for selecting the suppressor against the transient waveform your circuit is exposed to.
SMC package and what it means for assembly
Tin-lead finish is typical for this package style, which affects the solder paste profile and reflow temperature zone. Tape-and-reel packaging suits high-volume SMT pick-and-place; cut-tape is available for prototype quantities.
Power line protection vs. board-level protection
The listed "Power Line Protection: No" means this is not rated for direct mains or high-energy power-line surge suppression — that class requires larger, higher-energy TVS or MOV devices rated for the full prospective fault current. The 1.5SMCJ series handles board-level signal and control-line transients, not AC mains. The unidirectional single-channel topology clamps positive-going transients to ground; it does not protect against negative overvoltage reversely — for bidirectional protection across an AC signal line you would need a dual-polarity or back-to-back TVS. This one stays in the one-direction clamp category.