100V rail protection in a single bidirectional package
The SMBJ100CA-13: Its 100V reverse standoff voltage means the device draws negligible leakage below that threshold, so it sits across the rail without loading the circuit during normal operation.
Clamp voltage and peak current — what the let-through means
When the transient exceeds the 111V minimum breakdown voltage, the diode avalanches and clamps the surge to a maximum 162V while conducting up to 3.7A of peak pulse current. That 162V ceiling is the voltage the downstream components must survive — a 160V-rated MOSFET on the same rail has no margin, so a 200V-rated part is the practical choice. The bidirectional configuration means a single device protects both positive and negative transients on the same line — useful for AC-coupled signals or floating supplies where polarity is not fixed.
Package and board integration for the layout engineer
Housed in the DO-214AA (SMB) surface-mount package with the supplier device package code SMB, the footprint is standard across the SMBJ series. The junction operates from -55°C to 150°C, covering industrial and automotive under-hood ambient without derating the peak pulse power at the upper end — though the 600W rating is derated linearly above 25°C per the datasheet curve. The base product number SMBJ100 indicates the 100V standoff variant; the CA suffix marks the bidirectional version. Tape & Reel and Cut Tape packaging are available, with the reel quantity set by the DO-214AA carrier dimensions — typically 3000 pieces per 13-inch reel.