500W Zener clamp for 54V rails
The SMAJ54E3/TR13 is a Zener-type TVS diode from Microchip Technology, rated for 500W peak pulse power per the 10/1000µs waveform — enough to clamp a 5.2A surge on a 54V supply rail down to 96.3V max. That 500W rating is the headline number for transient protection: it tells you how much energy the part can absorb before the junction gives way.
Minimum breakdown voltage is 60V, with a reverse standoff of 54V — meaning the part stays transparent on a nominal 48V or 54V bus and only starts conducting when the line rises above 60V. Clamping voltage is 96.3V max at the rated 5.2A peak pulse current. That 42V headroom between standoff and clamp is the margin the downstream silicon sees; if the load can survive a 96V transient, this part fits.
Active production, DO-214AC package on reel
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