What caps is this?
in [Repair]
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From: Jeff Liebermann on 20 May 2010 12:19 On Wed, 19 May 2010 22:05:48 -0700, Paul Conners <pconners98(a)gUSmail.com> wrote: >7 mm H, 4 mm W & D. > >> My guess(tm) is Tantalum. It's not ceramic as it appears to be >> polarized. It's not metalized film, for the same reason. It's too >> small for electrolytic. That leaves tantalum. > >Being molded plastic, does this automatically rule out electrolytic? Possibly, because I've never seen any electrolytics in Epoxy-B molded packages. However, Phil Allison indicates that they might be electolytics, so I can't be 100.0% certain. Worse, the original photo shows a silk screen component outline that's somewhat larger than the Siemens capacitors. I'm fairly sure that anything 7x4x4mm would be tantalum, but the larger outline size could easily have been either tantalum or electrolytic. >The originals are black and beveled at the front corners. None of these are. >Other than physical, not much to go on... A Kemet substitution might be problematic as they don't have a packages that's an exact match. Sorry for the diversion. If you don't want to crack one open to see what's inside, and finding an exact substitute seems to be a problem, then replacement with a simple dip tantalum 1uf 50v should both fit and work. I don't have any problems with substituting tantalum for aluminum electrolytic because of the lower ESR of tantalum. However, going the other way will probably not work. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: Paul Conners on 20 May 2010 12:51
> I'm fairly sure that anything 7x4x4mm would be > tantalum... They are tantalum: <http://www.datasheetarchive.com/pdf-datasheets/Datasheets-17/DSA-334079.pdf> The German electronics news group was the resource that broke the case... Thanks to everyone who contributed. |