Transient protection with a 1500W peak pulse ceiling
The 1N6270ARL4G is a single-direction Zener TVS from onsemi's Mosorb™ series, rated for 1500W peak pulse power at 10/1000 µs waveform. That 1500W rating defines the surge energy it can clamp before the junction gives way — for a 7.78V standoff line, this part handles transients that would blow a lower-rated device.
Clamping window and breakdown margin
Reverse standoff voltage is 7.78V typical; the breakdown starts at 8.65V minimum, and clamping maxes at 13.4V at rated Ipp. That 5.6V window from standoff to clamp means the protected rail sees less than 14V during a surge — critical for 12V nominal bus protection where the downstream silicon must survive the clamp. Operating temperature spans -65°C to 175°C junction, which covers military and industrial thermal extremes without derating the peak pulse power at the hot end.
Obsolete status and sourcing path
onsemi lists the 1N6270ARL4G as Obsolete. For a BOM that needs this exact order code, the only sourcing channel is the spot market or excess inventory. We can quote against your quantity from available stock — no lead time from the fab, but we confirm availability at quote time.
Package and mounting fit
Through-hole axial DO-201AD package — the same footprint as the industry-standard 1.5KE series. The lead bend and hole diameter on the PCB match the 0.040-inch lead diameter; no board respin needed if you are replacing a 1.5KE7.5A or similar.