What the voltage ratings mean for your rail
The SMBJ6.5A-13-F: With a 6.5V reverse standoff voltage, this TVS sits across a 5V or 6.5V supply without conducting during normal operation. Breakdown is guaranteed at 7.22V minimum, so the device starts clamping before the downstream components see overvoltage. That clamping figure tells you the highest voltage the protected load sees during a surge — if your 6.5V rail's downstream ICs have an absolute maximum below 11.2V, this part may not be the right fit.
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