[sdiy] bypass caps, subbing MLCC for Electrolytic

[Harry Bissell]

The ceramic caps are just fine for bypassing, except in some
critical switching power supply designs that might specify to
USE ONLY electrolytic or USE ONLY MLCC (depends on whether the ESR
is a "bug" or a "feature"

Ceramics are nice in that they take high SMT temperatures, and are
inherently non-polar.  Watch out for the dielectric... some like
Y5V (there is a cap in the circuit, its size is basically unknown and you don't care...) 
are really crap (Z5U is not much better). I prefer X7R if they would
be small enough...

H^) harry


----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'Tony Rolando' <tony at makenoisemusic.com>, synth-diy at dropmix.xs4all.nl
Sent: Tue, 05 Oct 2010 12:26:34 -0400 (EDT)
Subject: Re: [sdiy] bypass caps, subbing MLCC for Electrolytic

>   Hello, Has anybody ever had any problems subbing a MLCC type cap for
> an electrolytic in a bypass situation? Low ESR is not required. 16V 10uF
> Electrolytic was called, I'd like to use 16V 10uF MLCC in order to save
> space.

I use 10uF electrolytics in this application which are only about 0.2" in
diameter and about 0.5" high, and have 0.1" lead spacing.  Is it the
diameter or the height that you are worried about?

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-- 
Harry Bissell & Nora Abdullah 4eva