1500W TransZorb for automotive transient protection
The 1.5KE43HE3/73: Clamping voltage hits 61.9V max at 24.2A peak pulse current, with a 34.8V reverse standoff — means a 24V or 28V automotive rail gets clamped before the downstream ICs see damage. AEC-Q101 qualification puts this in the automotive-grade bucket — production-level PPAP, temperature cycling, and ESD reliability screening.
Obsolete — sourcing through surplus channels
Vishay lists the 1.5KE43HE3/73 as obsolete. The part is available through independent surplus and broker inventory — lot-specific, date codes confirmed at RFQ. The DO-201AA axial package is a through-hole form factor — board rework is straightforward with a standard soldering iron. No MSL concerns for this leaded package; bake-out is not required before reflow.
Key parametric limits for BOM fit check
Breakdown voltage min is 38.7V — the device starts conducting at this threshold. Reverse standoff of 34.8V means it sits transparently on a 28V rail and only clamps during a transient. Single unidirectional channel, so polarity matters: cathode to the protected rail. Peak pulse current of 24.2A at the 10/1000µs waveform defines the surge capability. Power line protection is not supported — this is a signal-line or low-side rail clamp, not a mains-side suppressor.