Protection window and pulse rating
The SMBJ130A-13-F: This is a Zener-type TVS diode — it clamps by avalanche breakdown, not by switching. The reverse standoff voltage is 130 V, meaning the protected rail can run at 130 V DC without the diode conducting. When a surge exceeds the breakdown threshold (144 V min), the diode clamps the voltage to 209 V max at a peak pulse current of 2.9 A (10/1000 µs waveform).
No exposed thermal pad; the junction-to-ambient thermal resistance is managed through the copper pad area on the PCB. Reflow-compatible with typical lead-free profiles. Single unidirectional channel — polarity matters. The cathode band marks the ground side; reverse connection will forward-bias the diode and defeat protection. Use only on DC rails where polarity is fixed.
The wide range also gives margin for self-heating during repetitive surge events.
The SMBJ series is a broad, long-running family from Diodes Incorporated, so second-source equivalents from other manufacturers (same DO-214AA footprint, same 130 V standoff) are available for BOM hedging.