What the ratings mean for the BOM
The 1.5KE250CAHA0G: Its job is to clamp transients, not regulate a rail. Above that, breakdown starts at 237V minimum, and the clamping voltage peaks at 344V at the rated 4.5A peak pulse current. For a 24V or 48V automotive bus, this part protects against load-dump and inductive kickback, but the 214V standoff means it is sized for higher-voltage rails — think 120V or 277V AC lines, or DC bus voltages in the 150-200V range. That 4.5A figure is the surge current the part can handle before the clamping voltage rises above 344V. If your transient exceeds 4.5A at the clamp voltage, you need a higher-power device in the same 1.5KE family — the 1.5KE series scales by peak power, not just voltage.
AEC-Q101 qualification certifies this part for automotive-grade stress: the temperature cycle, high-temperature reverse bias, and ESD robustness tests that separate automotive silicon from commercial. The single bidirectional channel means one device protects both positive and negative transients on a single line — no need for two series-opposing unidirectional TVS diodes. Power line protection is marked as 'No', which simply means this is not a dedicated rail-clamp array with multiple channels; it is a single discrete TVS for one signal or power line.
Through-hole mounting in a DO-201AA / DO-27 axial package. The axial leads are 0.96mm diameter typical, spaced 8.5mm apart on the body — the hole pattern on the PCB must match the lead spacing, and the lead bend radius should not exceed the datasheet recommendation to avoid cracking the glass passivation. Supplied in Tape & Box (TB) — the axial leads are taped in a box, not on a reel. This is the standard packaging for through-hole TVS diodes in production volumes; the tape pitch is 52mm per EIA-296. For hand-assembly or rework, the part is also available in bulk or cut tape from distribution.
Sourcing and lifecycle posture
The part is traceable to the manufacturer's date code and lot number per the standard semiconductor supply chain.