Please recommend a capactor for this purpose

[alank2]

I am currently using an aluminum in a project as the main cap (330 uF), but it is not low profile enough even though I've already picked the shortest fattest one I could find using digikey's search.  The project is a 5V project.

Cost isn't a huge factor as I wont' be making many.  What I'd like is:

Flat
Long term durability

What are aluminum-polymer good for?

It seems like tantalum's have a bad rep - or do people not use them right?

What about paralleling large ceramic like a couple of 150uF?  They aren't cheap, but they are flat...

Other ideas?

[michaeliv]

How low profile do you need?
How about:
- Lay a long thin electrolytic on it's side.
- Parallel 3x1210 or even 8x0805.

[Eric_the_EE]

Are surface mount components an option for this project?

[alank2]

Are surface mount components an option for this project?

It is practically all surface mount...

[bktemp]

Large ceramic capacitors have a large tolerance and and a huge voltage dependency. You probably have to buy ceramic capacitors with more than 1000uF to get 330uF at 5V.
https://www.maximintegrated.com/en/app-notes/index.mvp/id/5527

Depending on your circuit tantalum caps may be fine.

[Audioguru]

You forgot to post the schematic for us to see why you need such a high capacitance. Maybe by using a higher resistor value or a high input resistance circuit the capacitance can be much less.

[alank2]

This is sort of general main capacitor purpose..  Probably the biggest instantaneous draw is the display which can go from 0 to 125mA very quickly.  I think I'm going to go with 3 or 4 100uF ceramic capacitors and see how that does.