Look carefully at https://www.onsemi.com/pub/Collateral/MG2040-D.PDF … vs https://www.onsemi.com/pub/Collateral/ESD7008-D.PDF … and tell me how those aren't the *same exact chip* being sold with two different pinout diagrams with different pins marked as NC. Ha.
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Replying to @marcan42
They report having different clamping voltages and capacitances, one has noisier curves, and one has a completely different behavior in the negative TLP I-V curve. Also one has square pads on the bottom while the other has pentagonal. Clearly very similar, but not identical chips
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Replying to @codahighland @marcan42
My guess: The MG2040 was made to be a drop-in replacement for the ESD7008 in HDMI applications and allowing slop that doesn't matter for USB/Thunderbolt use since HDMI doesn't need such high bandwidth in the reverse direction.
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Replying to @codahighland
Everything you mentioned can be explained by the fact that one pinout diagram puts GNDs through diodes (connected to what would be "IO" pins in the other), and the other one hooks up GND directly to the common line of the diodes.
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(except the pentagonal pads, but that doesn't mean it isn't the same die and bond-out)
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