Zener TVS for 78V rail protection
It delivers 1500W peak pulse power per the 10/1000µs waveform, with a breakdown voltage minimum of 86.7V and a clamping ceiling of 139V at 10.8A peak pulse current. This is a unidirectional device — one channel, cathode banded — intended for DC rail clamping where the protected line stays above ground. The DO-214AB (SMC) package suits reflow assembly and handles the 1500W pulse without exceeding the -65°C to 150°C junction temperature range.
Clamping voltage and pulse current budget
At 139V clamping maximum, the SMCJ78E3/TR13 leaves margin for a 100V-rated downstream capacitor or regulator on a 78V bus. The 10.8A peak pulse current (10/1000µs) sets the energy-handling floor — a 1500W pulse at 139V draws 10.8A, and the device must absorb that without latch or failure. No power line protection rating means this part is not rated for continuous AC mains clamping; it is a DC rail transient suppressor. The Zener breakdown characteristic gives a sharper knee than an MOV, which matters when the protected circuit has a tight overvoltage threshold.
Active production and Tape & Reel supply
The DO-214AB (SMC) package is a common footprint; confirm the pad layout matches your assembly profile before committing.