78 V rail protector — Zener TVS in DO-214AC
Its 86.7 V minimum breakdown voltage means the avalanche triggers before the protected circuit sees damaging voltage, and the 139 V maximum clamping at 3.6 A peak pulse current (10/1000 µs waveform) keeps the spike below the breakdown of typical downstream semiconductors. Rated for 500 W peak pulse power, this part handles moderate transients on industrial or telecom supplies. The DO-214AC (SMA) surface-mount package suits automated assembly and keeps the footprint compact.
On a 48 V nominal bus with 20 % tolerance, this part stays off until a transient pushes the rail above 78 V. The 86.7 V minimum breakdown ensures the avalanche starts early enough to clamp before the spike reaches 139 V. At 3.6 A peak pulse current, the clamping voltage is held to 139 V. For a 500 W peak pulse rating, the actual energy capability depends on the pulse duration — the 10/1000 µs waveform is the standard telecom test condition. If your transient is shorter, the part absorbs more peak power; if longer, derate accordingly. No power line protection — it is not designed for continuous overvoltage on AC mains, only for transient suppression on DC rails or signal lines.
Active production — sourcing and package details
The DO-214AC (SMA) package has a standard 0.065-inch body width and 0.040-inch height — confirm your solder paste stencil aperture for the gull-wing leads. For volume pricing and lead time, submit an RFQ against your BOM quantity.