What the 1N6267ARL4G is
The 1N6267ARL4G is a unidirectional Zener-based transient voltage suppressor (TVS) in Littelfuse's Mosorb series, housed in the DO-201AD axial package. Mosorb parts are general-purpose Zeners rated for through-hole board assembly — the axial lead form factor handles vibration and thermal cycling better than a small-signal SMD part in rugged environments.
Peak pulse power and voltage ratings
Peak pulse power is rated 1500 W (1.5 kW) at the waveform defined in the relevant transient-suppression standard. That figure is the pulse-energy ceiling the Zener junction absorbs without degradation — it is not a continuous dissipation rating. For a TVS protecting a low-voltage rail, 1.5 kW means it survives the first-tier spike and clamps before the downstream IC sees overstress. Breakdown voltage minimum is 6.45 V; reverse standoff typical is 5.8 V. The standoff is below the breakdown threshold — the part sits off-state during normal operation and transitions into avalanche at the breakdown voltage when a transient arrives. Maximum clamping voltage at peak pulse current is 10.5 V, which defines the headroom the protected rail sees during a fault event.
Temperature grade and what it means for deployment
Junction temperature rating is -65 to 175 °C (TJ). The 175 °C ceiling is the distinguishing spec for this part — most general-purpose Zeners top out around 150 °C. A 175 °C junction rating matters in equipment that runs hot by design: power supplies near the magnetics, motor drives in a sealed enclosure, or industrial instrumentation in ambient temperatures that would push a lower-rated part past its limit.