What the 1500W rating means for your BOM
The 1.5KE11HE3/54: That 1500W rating tells you it can absorb a short, high-energy transient — like a load dump or inductive kickback — without failing short, which is what makes it a go-to for clamping spikes on 12V automotive power rails. The 92.6A peak pulse current (Ipp) at that clamp voltage means it handles a hefty surge — think alternator field dump or a relay coil kick — before the silicon gives out.
AEC-Q101 and the TransZorb series
This part carries AEC-Q101 qualification, meaning it's been through the automotive-grade stress tests: high-temperature reverse bias, temperature cycling, and ESD robustness. The TransZorb series is Vishay's branded TVS line, known for tight clamping and fast response — the 'HE3' suffix flags the automotive flow. Lifecycle status is obsolete per the manufacturer. That means Vishay no longer produces it, and the last-time-buy window has closed. For new designs or BOM fills, sourcing goes through independent distribution — quantities are confirmed at RFQ, and no direct factory replacement is listed.
Housed in a DO-201AA (DO-27) axial-lead package, it's through-hole mount — hand-solderable on a perfboard or production wave-solder line. No power line protection (it's a unidirectional TVS, not a bidirectional or steering diode), so it's meant for DC rails, not AC mains.