What the 1N6268ARL4 protects and where it fits
The 1N6268ARL4 is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W peak pulse power at 1 ms. It clamps transients on a 6.4V nominal rail, with a breakdown voltage between 7.13V and the maximum clamp of 11.3V at the peak pulse current. The DO-201AD axial package suits through-hole board layouts where a leaded part is preferred for thermal mass or retrofitting an existing hole pattern.
Key voltage ratings and what they mean for your rail
The reverse standoff voltage of 6.4V is the maximum DC or AC peak voltage the diode will not conduct under normal operation — your rail should stay below this. The minimum breakdown voltage of 7.13V is where the diode starts to avalanche; the clamping voltage of 11.3V at the peak pulse current is the maximum voltage the protected circuit sees during a surge event. The 1500W peak pulse rating assumes a 1 ms pulse width; derate for longer pulses per the datasheet curve.
Temperature range and environment
The junction temperature range spans -65°C to 175°C, which covers most industrial and automotive underhood environments. The through-hole axial package dissipates heat through the leads and the board copper — no exposed pad to solder to a plane.
Lifecycle status and sourcing reality
onsemi has marked the 1N6268ARL4 as Obsolete. No official successor is listed in the available records. If a last-time-buy window has closed, a parametric match within the Mosorb family or a comparable TVS from another brand may be needed — confirm the standoff voltage, package, and peak pulse power before substituting.