What the 600W peak pulse rating means on your rail
The SMBJ85A-13-F: The 85V reverse standoff voltage (Vrwm) means it sits across a nominal 85V DC rail without conducting leakage — it only starts clamping when the transient pushes above 94.4V breakdown. At the full 4.4A peak pulse current, the clamp voltage reaches 137V max, which sets the voltage stress the downstream components must survive.
Package and rework — DO-214AA SMB
The DO-214AA (SMB) package is a standard surface-mount footprint with a single unidirectional channel. The junction operates from -55°C to 150°C, so the part survives reflow profiles typical for lead-free solders without thermal damage. The body is small enough that hot-air rework is straightforward — the cathode band marks polarity clearly, and the pad layout matches common SMB land patterns, meaning you can lift and replace this part without lifting the pad.
Lifecycle and supply posture
Diodes Incorporated lists the SMBJ85A-13-F as Active.