Mosorb™ Zener TVS – 1500W surge protection in a DO-201AD axial package
The 1N6281ARL4G is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W peak pulse power at 1ms. It clamps transients at 37.5V maximum while standing off 23.1V DC continuously, with a minimum breakdown voltage of 25.7V. The DO-201AD axial package suits through-hole mounting on power rails, industrial control inputs, and telecom line cards where a single device must absorb a high-energy surge without failing short.
onsemi lists the 1N6281ARL4G as Obsolete. No official successor part number is published in the available records. For BOM lines that still specify this exact order code, procurement must rely on independent-distributor inventory or broker channels.
The 23.1V reverse standoff voltage is the maximum DC or peak AC voltage the TVS can endure without conducting appreciably — your protected rail must stay below this level. The 25.7V minimum breakdown defines where avalanche conduction begins; the 37.5V clamping voltage is the peak voltage the load sees during a 1.5kW surge. The 1500W peak pulse power rating assumes a 1ms exponential waveform; derate for longer pulses per the datasheet curve.
Temperature range and package considerations
Junction temperature range spans -65°C to 175°C, covering military/aerospace ambient extremes. The DO-201AD axial package requires a through-hole solder joint; the lead length and board copper area influence thermal impedance during repetitive surge events.