Obsolete TransZorb — what it means for your BOM line
Vishay lists the 1.5KE200A/54 as Obsolete — the manufacturer no longer produces this exact order code. For a BOM line that calls out this 1.5 kW TransZorb, the procurement path runs through independent surplus and broker channels, not the factory. Availability is lot-specific and confirmed at RFQ time.
Protection ratings that decide the fit
Reverse standoff voltage is 171 V — the TVS stays off below this rail voltage. Breakdown triggers at 190 V minimum, clamping the transient to 274 V maximum at the 5.5 A peak pulse current (10/1000 µs waveform). The 274 V clamp means a 400 V rated downstream capacitor sees a safe voltage during the event. Single unidirectional channel — polarity matters on the board. The anode-to-ground orientation must match the DC rail being protected.
Package and rework reality
DO-201AA (DO-27) axial-lead, through-hole — a hand-solder-friendly package. The leads are stout enough to survive a rework cycle without pad lift, and the body orientation (cathode band) is clearly marked on the part.