1500 W peak pulse in an axial DO-201AD
The 1.5KE27AG: The 40 A peak pulse current rating tells you the surge the part can handle before the junction exceeds its thermal limit — this is the figure to compare against your system's expected transient energy, not the standoff voltage alone. Operating temperature spans -65°C to 175°C (junction), covering the full industrial and automotive ambient range with margin for self-heating during a surge event.
Obsolete — sourced through independent channels
Littelfuse lists the 1.5KE27AG as obsolete. No official successor or second-source is recorded in the manufacturer's lifecycle data. Available through independent surplus and broker channels. Quantities are lot-specific; stock position and pricing are confirmed at RFQ. The axial DO-201AD package is a standard footprint, so a pin-compatible drop-in from another TVS family may exist — cross-reference against your clamp voltage and peak pulse requirements at quote time.