This is a follow up to this issue: Damaged TPL7407LA Transistor Array (*Updated With Scope Testing Images*)
We are experiencing both reverse polarity and transient voltage spikes in our automotive circuit application pictured above where we've added protection for both situations but are still experiencing aforementioned behavior when an adjacent input to our device is being switched off (oscilloscope input 3 – PARK).
The only feasible possibility that we can consider at this point is the fact that the diodes may not be reacting quick enough these conditions.
Here are the reverse polarity and TVS diodes we are using, respectively.
Curious to hear what you folks have to say on this topic.