1500W Zener TVS in DO-214AB — 33.3V standoff, 53.9V clamp
The 1.5SMC39AT3 is a single-channel unidirectional Zener TVS diode from onsemi, rated for 1500W peak pulse power at 10/1000µs. Its 33.3V reverse standoff voltage makes it a fit for protecting 24V DC rails, with a maximum clamping voltage of 53.9V at 28A peak pulse current. Housed in the SMC surface-mount package, it operates over the full -65°C to +150°C junction temperature range — suitable for industrial and outdoor environments where thermal cycling is a concern.
Obsolete — sourcing via sealed factory reels
Onsemi has marked the 1.5SMC39AT3 as Obsolete. For BOM lines still calling this order code, the sourcing path is surplus inventory — sealed factory reels with consistent date-codes are the preferred grade.
Package and mounting — DO-214AB SMC
Surface-mount SMC package with a copper pad area under the cathode tab that directly affects thermal resistance. The supplier device package is also SMC. Available in Tape & Reel (TR) or Cut Tape (CT) options.