The 1.5KE43CAE3/TR13: For existing designs, this part can still be sourced through independent distribution channels.
Clamping and standoff — what the ratings tell you
The reverse standoff voltage is 36.8V, meaning the device stays transparent on a nominal 36V rail and only conducts when the transient exceeds the breakdown threshold of 40.9V minimum. Bidirectional single-channel configuration — one device protects both polarities, simplifying PCB layout for AC-coupled or bipolar signal lines.
Package and rework — DO-201AA axial lead
Through-hole DO-201AA (DO-27) axial package, supplier device package CASE-1. The axial leads are robust for hand-soldering or wave-solder; the body is large enough to dissipate the pulse energy without lifting pads, but the lead bend radius matters — sharp bends near the glass seal can crack the body. Keep the bend at least 2 mm from the case. Operating temperature range -65°C to 150°C junction — suitable for outdoor or industrial enclosures where the ambient sees wide swings.