You don’t actually want to be able to hit most chips with light. There’s efforts to encapsulate some WCSP devices in opaque coatings specifically because the si

You don’t actually want to be able to hit most chips with light. There’s efforts to encapsulate some WCSP devices in opaque coatings specifically because the silicon itself can be affected by light. Here’s an example of this behavior reported on some ADI parts: https://ez.analog.com/power/f/q-a/559687/photosensitivity-of-csp-packages https://ez.analog.com/power/f/q-a/559687/photosensitivity-of...