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Bad capacitors

Introduction

Capacitor plague is a royal bitch. Many brands of electronics contain cheap, inferior capacitors which tend to fail prematurely, usually shortly after the warranty expires. The culprits are the low-ESR aluminium electrolytic capacitor using water-based electrolyte with a bad formula. (To complicate things further, a perfectly good capacitor can degrade quickly in a badly designed circuit that exceeds its ratings.) There are lists and hearsays on the Net.

The lifetime is dramatically influenced by the ambient temperature. A capacitor should keep its parameters within specs for 2000 hours at the rated temperature. For each 10 °C less the lifetime roughly doubles; e.g. a 105 °C capacitor will last 8000 hours at 85 °C.

The ESR of the capacitors can be measured by e.g. an ESR meter.

For my personal use and amusement I am compiling the table here.

Good-reputation brands

BrandRefsWebDescription
Rubycon[goodcaps]GOOGExcellent reputation. Relatively high price. Offered by badcaps.net. Beware of immitations, e.g. Rulycon or Rudeycon.
Samxon[goodcaps]GOOGVery good reputation. Offered by badcaps.net.
Panasonic[goodcaps]GOOGGood reputation.
Nichicon[web]GOOGSaid to be good. One batch reported failing in/before 2006.
Chemicon[goodcaps]GOOGSaid to be good.
SanyoGOOGSaid to be good.
Xicon[badcaps2]GOOGSaid to be good. Not low enough ESR for motherboards.

Suspicious brands

BrandRefsWebDescription
Apsun[capsmod]GOOGFormerly GSC.
Arcon[badcaps][capsmod][computek]GOOG
Asiacon[capsmod]GOOG
Asia-x[capsmod]GOOG
Canicon[badcaps][badcaps2][capsmod][computek]GOOG
Capxon[me][badcaps][capsmod]GOOG"CrapXon". Failed on me in three Acer LCD monitors. Said to be between the worst of the bad.
Chhsi[badcaps][capsmod]GOOG(inactive site)
Choyo[badcaps][capsmod][computek]GOOG
CTC[badcaps][capsmod]GOOG
Decon[me][badcaps2]GOOGFound exploded in a failed Mascom-brand settopbox. "Rat poison cap". Few web hits.
DST[badcaps][capsmod]GOOG
D.G.[computek]GOOG
D.S.[computek]GOOG
Elgen[capsmod]GOOG
Elite[badcaps2]GOOG
Evercon[badcaps2]GOOGFormerly GSC.
FPCAP[badcaps]GOOGFujitsu brand; mixed results. can fail or be ok
Fuhjyyu[me][badcaps][capsmod][UrbDict]GOOGFound inflated in my power supply that made a computer unstable.
Fuh Yin[badcaps][capsmod]GOOG
Fulltec[capsmod]GOOGAlso known as Hec.
FZ55[computek]GOOGFZ series
G-Luxon[badcaps][capsmod][computek][web]GOOG
GL[badcaps][capsmod]GOOG??
Gloria[badcaps][capsmod]GOOG(inactive site)
GSC[badcaps][capsmod][computek]GOOG
Hec[badcaps][capsmod]GOOG
Hermei[badcaps][capsmod]GOOG
I.Q.[badcaps][capsmod][computek]GOOG
Jackcon[badcaps][capsmod][computek]GOOG
Jamicon[capsmod][computek][web]GOOGSaid in the audio community to be bad. Also said to be the good ones of the bad ones.
JDEC[badcaps][capsmod]GOOG
Jee[badcaps][capsmod]GOOG
JPce-tur[capsmod]GOOGAlso known as Pce-tur
Jpcon[badcaps][capsmod]GOOG
Jun Fu[badcaps][badcaps2][capsmod]GOOG
Lelon[badcaps][capsmod][computek]GOOG
Ltec[capsmod][capsmod]GOOG
Licon[badcaps][capsmod]GOOG
MK[web]GOOGrumoured to be bad
Nkcon[badcaps][capsmod]GOOG
Nrsy[badcaps][capsmod]GOOGThese are phony Nippon caps.
OST[badcaps][capsmod]GOOG
Partsnic[badcaps][capsmod]GOOG
Pce-tur[badcaps][capsmod]GOOG
Raycon[badcaps][capsmod]GOOG
Rubysun[badcaps][capsmod]GOOGShenzen Eagle New Technology Electrical Industry Co. Ltd.
Rulycon[badcaps][capsmod][computek]GOOGRubycon immications.
Sacon[badcaps2][computek]GOOGFormerly GSC.
Sam Young[computek][web]GOOGFormerly GSC.
SEC[badcaps2]GOOG
Skywell[badcaps][capsmod]GOOG
Stone[badcaps][capsmod][computek]GOOG
Supacon[badcaps][capsmod]GOOG
Su'scon[badcaps][capsmod]GOOG
Taicon[badcaps][capsmod]GOOG2 reports of fails only but not very commmon to see these caps on motherboards
Tayeh[badcaps][capsmod][computek]GOOG
Teapo[badcaps][capsmod][computek]GOOG
TMS[capsmod][computek]GOOG
Tocon[badcaps][capsmod]GOOG
Vent[capsmod]GOOG
Viva[computek]GOOG
Wendell[badcaps][capsmod][computek]GOOG
Xunda[web]GOOG
Yec[badcaps][capsmod]GOOG

See also...

Badcaps.net

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