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TUSB8042A: What is difference point between USB8041, USB8041A, USB8042 and USB8042A?

Part Number: TUSB8042A
Other Parts Discussed in Thread: TUSB8041, TUSB8041A, TUSB8042,

Hello guys,

One of my customers is considering using one of USB8041, 8041A, 8042 or 8042A for their new products.
They want to use the device as 5Gbps 4 port USB3.0 HUB for connection to USB-GbE controller board and Type-A port.

At this moment, they have the following questions.
Could you please give me your reply?

Q1.
What is difference point between USB8041, USB8041A, USB8042 and USB8042A?

Q2.
Do you have any recommended device for their usage except these devices? 

Your reply would be much appreciated.

Thank you and best regards,
Kazuya.