R108.00 for a Capacitor? Is that Right - Page 1
Forum section: electronics / general

author: kolbep
author_rank: Frequent Contributor
timestamp: January 10, 2014, 07:58:30 pm
content: Hi,On a South African auction site, some guy is selling :ELECTROLYTIC RADIAL CAPACITOR,1200uF 160VEXTENDED TEMPERATURE-40 TO 105 DEGREES C.D=30 H=40mmhttp://www.bidorbuy.co.za/item/125741271/ELECTROLYTIC_SNAP_IN_CAPACITOR_EXTENDED_TEMPERATURE_1_200uF_160V.htmlfor R108.00 Starting Price (10.12usd).Excluding shipping.Am I dreaming, or is that Overkill for a cap.If it is overkill, I am thinking of adopting this guys business model for Online Auctions.P

author: c4757p
author_rank: Super Contributor
timestamp: January 10, 2014, 08:01:43 pm
content: Mouser wantsUS $4.46for a similar capacitor.

author: SeanB
author_rank: Super Contributor
timestamp: January 10, 2014, 08:09:36 pm
content: Must have been using the RS price list as a starting guide. Then doubling it and charging postage as well.You know what they say about a fool and his money.....Daar is dom, daar is onnoosel, en dan is daar dom onnosel. As jy een koop dan het jy meer geld as breins.Looking at the seller they probably have stock they bought at R15 to the dollar a while ago they want to get shot of. They are selling them though.......

author: idpromnut
author_rank: Unknown
timestamp: January 10, 2014, 08:11:57 pm
content: I had to buy a few of these (or similar, I forget the exact model):http://www.digikey.ca/product-detail/en/MAL211818102E3/4161PHBK-ND/263064Low ESR == not cheap

author: tom66
author_rank: Super Contributor
timestamp: January 10, 2014, 08:34:18 pm
content: Those aren't low ESR, a low ESR capacitor of that size would be around $2~3 and <50 mohm ESR. It probably cost a lot because it'sradialaxial.Quick tip, for good reliable low ESR caps, into Digikey or Farnell, type "1000uf 63v fm" for example which brings up any Panasonic FM series, try "hm" for Nichicon HM, "pw" for Nichicon PW, "ky" for Chemicon KY, "yxf" for Rubycon YXF, etc.Less than $2 a piece. (FC series low impedance long lifespan.)http://www.digikey.com/product-detail/en/EEU-FC1J102U/P11280-ND/353306$3 to $4 for a capacitor of similar size, though not sure if low ESR is important.http://www.digikey.com/product-detail/en/EET-HC2C122JA/P13954-ND/1755619

author: kolbep
author_rank: Frequent Contributor
timestamp: January 10, 2014, 08:39:26 pm
content: Just so you all know, I wasnt looking to buy, I was just browsing the 'ending soon', like checking things like that to see if maybe I can score something good, to play with, for cheap.

author: peter.mitchell
author_rank: Super Contributor
timestamp: January 10, 2014, 09:23:52 pm
content: Quote from: tom66 on January 10, 2014, 08:34:18 pmI'd say more likely the 8000hours at 125 degrees... for that price though...

author: tom66
author_rank: Super Contributor
timestamp: January 10, 2014, 10:25:07 pm
content: Unless you actually run your widget at above 105°C, you -rarely- need a 125°C cap.You can follow Arrhenius law. Say your widget runs at 50°C ambient and you use full rated ripple current, lifespan for each will be approximately doubled for each decrease in 10°C operating temperature.So, the Panasonic FC will last 5000 * 2^5.5 = ~220,000 hours. (i.e. 25+ years)The Vishay will last 8000 * 2^7.5 = ~1.4mn hours. (i.e. 160+ years)Now, yes the Panasonic will last less time, but 220,000 hours is VERY long, and realistically, the cap is likely to dry out and fail for other reasons than related to temperature by that point, so the two capacitors will be very similar and are unlikely to make much difference in overall product reliability.