1.5kW peak pulse, AEC-Q101, axial DO-201AA
It clamps transients at 77V maximum while standing off 47.8V continuously, making it a fit for 48V nominal rails in engine-control or body-electronics modules. The through-hole DO-201AA (DO-27) axial package suits legacy board layouts where a wave-solder or hand-solder step is already in the assembly flow. The 1.5KE56AHE3/51 is obsolete per the manufacturer; sourcing runs through independent distribution, confirmed per RFQ.
Breakdown, clamp, and peak current
Breakdown voltage starts at 53.2V minimum, ensuring the diode does not conduct during normal 48V bus operation. Power line protection is not supported — this is a unidirectional device for DC rail clamping, not AC mains.
Sourcing an obsolete AEC-Q101 TVS
Vishay lists the 1.5KE56AHE3/51 as obsolete. The AEC-Q101 qualification remains valid for existing designs, but new-program qualification should target an active Vishay or equivalent TVS in the same DO-201AA footprint. For BOM lines already locked to this part number, independent distribution holds inventory from surplus and overstock lots.