In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

In critical applications I place a overvoltage protection diode, like a P6KE6V8 across the 5V supply (cathode to plus, anode to minus). Such diodes can dissipate peak power pulses of up to 600W at very fast response times. For example, I'm using them in an application where an SX controls a concrete saw, where extreamly high voltage transients can occur caused by a 400V, 16 Amps three-phase frequency converter. May be it's a good idea adding such a device to your automotive application.

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