> Hello,
> I need a >=3D400V >=3D4.7uF pulse capacitor with a dV/dt rating >=3D20V/u=
s.
>=20
> I can find them on Mouser, Digikey, etc.. e.g.:
> http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfiles/F3294_PH
> E426.pdf/$file/F3294_PHE426.pdf
>=20
> But they are all too big/bulky!!
>=20
> What should I look for? Is there a different technology than
> polypropylene, still suitable for >=3D20V/us pulse applications, and is
> not as bulky as those caps?
>=20
> Even half the size would already be a big win for me.

What you are have found is a capacitor that is rated for continuous connect=
ion to 230V mains for use in mains filters or as motor run capacitors and t=
he like, often referred to as X2 rated, or something like that. I don't thi=
nk you will find anything else that will do what you want.=20

Note also that you don't quote a dI/dt rating - but this will probably be t=
he rating that will bite you in the backside. It is an easy rating to ignor=
e, and will often result in shorted capacitors, a familiar form of failure =
for anyone that attempted to use the old Philips 'lollipop' polycarbonate c=
apacitors in items like capacitor discharge ignition systems.
--=20
Scanned by iCritical.

--=20
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