1500 W peak pulse in a DO-201 axial body
The 1.5KE200A B0G: The 171 V reverse standoff voltage means it stays transparent on a nominal 170 V rail and only starts conducting when the transient exceeds 190 V breakdown. Clamping is hard at 274 V maximum — that is the voltage the downstream silicon sees during the event, so the 5.7 A peak pulse current rating is the surge it can absorb without failing short.
What the ratings mean for the BOM line
The 1500 W rating at 10/1000 µs is the standard TVS power metric — it is not continuous. The 274 V clamp sets the voltage stress on the protected load; for a 170 V bus, the 104 V headroom between rail and clamp is typical for this power class. Through-hole DO-201AA (DO-27) axial package — the leads are 0.96 mm diameter and the body is 5.3 mm diameter. The board footprint is a simple pair of plated holes on 0.35-inch centers. No power line protection (it is a unidirectional TVS, not a MOV or GDT), so it is sized for DC rail or signal-line clamping, not AC mains.
Active production — sourcing posture
Taiwan Semiconductor lists the 1.5KE200A B0G as active.