171 V standoff, 274 V clamp — the rail protection envelope
The 1.5KE200AHE3_B/C: Its 171 V reverse standoff voltage protects a nominal 170 V bus; clamping begins at 190 V minimum breakdown and holds the transient to 274 V maximum at the 5.5 A peak pulse current.
DO-201AA axial — through-hole for high-surge layouts
Supplied in tape and reel (TR) for automated insertion. The axial format is compatible with standard radial-lead forming equipment; the lead spacing matches the 1.5KE series footprint, so a board already laid out for a 1.5KE200A accepts this variant without layout changes.