Obsolete — sourcing through independent channels
The 1.5KE43-E3/54: The part is available through independent surplus and broker channels.
For a 34.8 V nominal rail, the 61.9 V clamping voltage (at 24.2 A peak pulse current) means the protected circuitry sees no more than ~62 V during the transient. Breakdown starts at 38.7 V minimum, so the diode stays off below that threshold and clamps above it.
Through-hole axial package — board integration
Housed in a DO-201AA / DO-27 axial leaded package, through-hole mount. The axial body sits inline with the leads, making it suitable for point-to-point wiring or PCB insertion with standard 0.100-inch pitch hole spacing. The 1.5KE package code indicates the body diameter and lead length match the industry-standard TransZorb footprint.