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Piezo/Ceramic Speaker Drivers?

Other Parts Discussed in Thread: LM48560, LM48580, LM4960, LM4802B, LM48557, LM4961, TPA2100P1

When I drill down from portable amplifiers->piezo I'm left with 3 choices:

LM48560, LM48580, and LM4960. 

However, when I search the site, I find many more: TPA2100P1, LM4961, LM4962, LM48555, LM48557, LM4802B, LM48223, etc.

How come these don't appear in the parametric search? They all seem relatively comparable and I'd like to be able to see them in a table to choose between them. My application is single-cell Li-Ion powered and portable, solution size is certainly an issue. It would be great to be able to see things like minimum supply voltage, available packages, etc. in a single table. Any ideas?

Thanks!