1500W Zener TVS – Mosorb™ in DO-201AD
It clamps transients to 21.2V maximum from a 12V reverse standoff, protecting downstream circuitry from surges like lightning or inductive load dumps. The DO-201AD axial package is through-hole mount, suited for high-reliability board-level protection in power supplies, industrial controls, and telecom equipment where a single robust TVS per rail is preferred over multiple SMD parts.
onsemi lists the 1N6376RL4 as Obsolete. For BOM lines already in production, last-time buy or sourcing through the independent market is the practical path.
Breakdown and clamping – what the ratings mean
Minimum breakdown voltage is 14.1V – the device begins conducting at this level, so the protected rail must stay below that in normal operation. The 12V reverse standoff gives a 2.1V margin before the TVS starts to leak; that margin shrinks with temperature, so a 12V rail with tight tolerance needs a higher standoff part. If the downstream components have a 20V absolute maximum, this TVS may not protect them; a lower-clamp part is needed.