Ic Package's Die Of QFP And TSSOP Are Different?

[mailrapid]

**broken link removed**

Why DIE of QFP is at the middle center(blue circle)?
Why DIE of TSSOP is at the bottom(blue circle)?

Is there any advantage or disadvantage?

 

[Optikon]

**broken link removed**

Why DIE of QFP is at the middle center(blue circle)?
Why DIE of TSSOP is at the bottom(blue circle)?

Is there any advantage or disadvantage?

I can't say for sure.. however, I do know that some TSSOP packages also come with a heatsink pad on the bottom of the part to facilitate heat removal. Perhaps that has something to do with it.

 

[mailrapid]

Thanks.
But how does QFP dissipate heat because of its die at the center?

 

[felis]

Maybe it won't produce that much heat?