What 1.5SMCJ90AS_R1_00001 is
The 1.5SMCJ90AS_R1_00001 is a unidirectional Zener-based TVS (Transient Voltage Suppressor) in the SMC (DO-214AB) package — the standard half-wave clamping device for board-level transient protection on single-ended power and signal rails.
Peak pulse power and clamping — what the numbers mean
The 10.3 A peak pulse current is the current the part must conduct without failing at that energy level. Reverse standoff is 90 V typ — the rail voltage the TVS leaks past at idle, well below the breakdown. When a surge hits, the part breaks down at 100 V minimum and clamps at 146 V maximum. That 146 V ceiling is what the protected downstream IC must withstand — a downstream circuit rated to 150 V abs-max has 4 V of margin under the clamping spec, which is tight; most designs budget the abs-max at 1.5× the clamp ceiling, so verify the downstream rating before committing.
Thermal and package fit
Junction temperature rated -55 °C to 150 °C. The 150 °C ceiling is wide enough for most industrial enclosures without forced-air cooling — the key is keeping the case temperature below whatever the mounting pad and PCB copper can dissipate. The DO-214AB (SMC) is the industry-standard surface-mount package for 1.5–3 kW TVS devices, so the land pattern is compatible across multiple manufacturers; the thermal pad under the body carries the heat to the PCB plane.