1500W Zener TVS in DO-201AD axial
The 1N6274A is a unidirectional Zener TVS diode from the onsemi Mosorb™ series, rated for 1500W peak pulse power at 10/1000 µs waveform. Its 12.4V minimum breakdown voltage and 11.1V reverse standoff make it suited for clamping transients on 12V nominal rails in industrial control, telecom, and power supply applications. The axial through-hole package allows manual insertion and rework, but the leaded form factor consumes board space and requires a drilled PCB — a consideration for compact or high-density designs.
18.2V clamp at peak current
At the peak pulse current Ipp, the clamping voltage is 18.2V maximum — this is the voltage the protected circuit sees during a surge event. The 1500W rating means the device can absorb a single 8/20 µs or 10/1000 µs pulse without failure, but repetitive surges require derating per the datasheet curve. Operating junction temperature spans -65°C to 175°C, covering most harsh-environment scenarios from outdoor telecom cabinets to engine-bay electronics.
Obsolete — sourcing and replacement planning
onsemi lists the 1N6274A as Obsolete. No official successor is published under the same base number. Buyers should verify last-time-buy (LTB) windows with distributors or evaluate electrically similar Zener TVS diodes in the same DO-201AD or surface-mount footprint. The base product number 1N6274 (without 'A' suffix) has a slightly different breakdown tolerance — the 'A' denotes ±5% tolerance on breakdown voltage. Confirm the exact BOM requirement before substituting. No stock-holding claim — each order is sourced against your BOM quantity.