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'[OT] Low Leakage Capacitors'
1999\01\10@192841 by James Cameron

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G'day,

Summary: Are all ceramic capacitors naturally "low leakage?"

A friend is building a battery powered remote control and has realised
that low leakage (< 0.5uA) capacitors in the circuit will significantly
increase battery life given that the main chip will enter a low power
sleep mode.

His design uses 10uF and 0.1uF capacitors for regulator stabilisation
and supply filtering throughout the board.  He has found low leakage
variants of the 10uF size in the Farnell cattledog, but not for the
0.1uF ceramics.  Does he need to look for them or do ceramics have a low
leakage anyway?

--
James Cameron                                      (spam_OUTcameronTakeThisOuTspamstl.dec.com)

OpenVMS, Linux, Firewalls, Software Engineering, CGI, HTTP, X, C, FORTH,
COBOL, BASIC, DCL, csh, bash, ksh, sh, Electronics, Microcontrollers,
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"Specialisation is for insects." -- Robert Heinlein.

1999\01\10@194124 by dave vanhorn

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>His design uses 10uF and 0.1uF capacitors for regulator stabilisation
>and supply filtering throughout the board.  He has found low leakage
>variants of the 10uF size in the Farnell cattledog, but not for the
>0.1uF ceramics.  Does he need to look for them or do ceramics have a low
>leakage anyway?

Cerams are generally FAR lower leakage than electrolytics, BUT I have had
some problems with 0.1uF (and no other value) shorting out in 5-10V
circuits. Multiple vendors... I'm switching to 0.047s unless I can't do it
without the 0.1.

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