1500W peak pulse, 128V standoff — what the ratings mean for rail protection
The 1.5KE150A-B: The 207V clamping ceiling means a 128V nominal rail sees the transient clipped before it reaches downstream silicon rated for 250V or less. The 1500W rating is the peak energy the device absorbs in a single surge — derate for repetitive events or elevated ambient temperature per the datasheet curve.
Obsolete — sourcing reality and the last-time-buy window
Diodes Incorporated lists the 1.5KE150A-B as obsolete. No official successor order code is recorded — the 1.5KE series has been superseded by newer TVS families, but no pin-compatible drop-in replacement is named in the lifecycle record. Availability is through independent surplus and broker channels. For a BOM line that depends on this exact part, the supply posture is per-quote — no standing stock or factory lead time applies.
DO-201 axial package — through-hole footprint for high-reliability boards
The 1.5KE150A-B ships in a DO-201AA / DO-27 axial-lead package (supplier device package DO-201). The through-hole body handles the thermal pulse of a 1500W surge better than a comparable SMD package — the lead frame and bulk copper carry heat into the board plane. Packaged in bulk (not tape-and-reel), so it suits hand-insertion or low-volume production runs.