19. TVS Diode Specifications

Question.1

Tony protects a 24V DC rail using Littelfuse SMBJ28A (V_RWM = 28V). The downstream IC has 40V absolute maximum rating.
During a surge, the IC gets damaged. What voltage did the IC see?
Note — Refer to the datasheet from DigiKey.

28.0V — the standoff voltage
31.1V — the breakdown voltage
45.4V — the clamping voltage
600V — the peak pulse power rating

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