20V rail protection — clamp voltage and pulse power
Its maximum clamping voltage of 32.4V at the peak pulse current of 18.5A (10/1000µs waveform) sets the upper voltage stress that downstream components must survive — a critical number for the protection budget of a 20V supply or data line. The 600W rating is the energy-handling ceiling; the actual margin depends on the application's surge impedance and repetition rate.
Breakdown and standoff — where the protection triggers
The reverse standoff voltage is 20V, meaning the diode remains non-conductive below this level. Breakdown occurs at a minimum of 22.2V, so the device starts clamping between 22.2V and the 32.4V maximum clamp. This window defines the trip point for a 20V rail — the diode does not load the line during normal operation. Power line protection is not featured, confirming this is a signal or low-power rail protector, not a mains-side suppressor.
Package and temperature range for the board
The base product number is SMBJ20; the suffix indicates the lead-free / RoHS-compliant finish.
This status supports new designs and long-term BOM commitments without a forced migration window.