Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
I_B_GREEN
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
I_B_GREEN   10/3/2012 7:48:22 PM
NO RATINGS
The only thing that sucks worse than electrolitics in electronics is batteries.

feralbeagle
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
feralbeagle   8/26/2012 10:34:28 PM
NO RATINGS
Haven't electrolytics gone through some changes in recent years? 40 years ago they were not very good and tantalum caps were plentiful, available and not connected with bad politics. Since then, hasn't there been some progress in density, operating temperature and ESR of aluminum electrolytics? I would like to know more about that.

MeirG
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
MeirG   8/19/2012 10:46:11 AM
NO RATINGS
For the last 40 years, I never used aluminum electrolytic capacitors, for the reasons stated in this article. I was always using tantalum capacitors. Yes they are more expensive! (By how much these days? I am now retired...) And you know the old adage about how much does the cost to replace a $1 part escalates as we progress from concept to the field of the product's life cycle...

David.Bley
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
David.Bley   8/15/2012 10:45:18 PM
NO RATINGS
Yes you have to pay attention to the voltage rating, the temperature rating and the ESR, but in order to get long life out of an electrolytic capacitor is to make sure that you are operating below the ripple current rating. It may be necessary to use lower value caps in parallel or to use an electrolytic with a higher ESR in parallel with a ceramic or other cap with a lower value and ESR to minimize the ripple current in the electrolytic. Inexpensive electrolytics tend to have a lower ripple current rating and physically small capacitors with a relatively large value also tend to have a lower ripple current rating.

Wilton.Helm
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
Wilton.Helm   8/15/2012 8:35:12 PM
NO RATINGS
True in general more than specific. SMPSs such as in computers, and these days motherboards (think POL switching converters) are also vulnerable. In all of these cases, though, I think is has less to do with voltage derating than ESR. Low ESR capacitors are more expensive, but they last longer because the produce less temperature rise with ripple. The extreme case is the DIY who replaces them with same capacitance and voltage from Radio Shack, without realizing that a low ESR device is required. That can lead to spectacular failures in a matter of hours.

nicolas.mokhoff
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
nicolas.mokhoff   8/10/2012 9:24:36 PM
NO RATINGS
this has been fixed

I_B_GREEN
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
I_B_GREEN   8/3/2012 11:05:42 PM
NO RATINGS
Companies should make these electrolitics easily replaceable with detachable or sub assemblies that can be replaced easily when the cost is prohibitive to use other technologies yet the electrolitics are an order of magnitude worse in failure than the rest of the system is.

I_B_GREEN
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
I_B_GREEN   8/3/2012 11:02:53 PM
NO RATINGS
Same issue with all the flat screen tv's you see out on the curbs dead. its the electrolitics. Most of these do not get exposed to external sources of heat like this LED example shows. But they die in the same overtemperture boiled off electrolyte way. They were not deraited for voltage and thus run hotter when driven near 100% of voltage raiting. The AC ripple voltage has a higher RMS power drop in the capacitor at higher and higher voltages. This is why the general rool of thumb is derate to 50 or 40% of rated voltage so that the MTBF of the capacitors has a chance to last as long as intended. The only thing more unreliable than an electrolitic capacitor even when derated is a battery.

mtripoli
User Rank
Author
re: Power Tip 50: Avoid these common aluminum electrolytic capacitor pitfalls
mtripoli   8/1/2012 4:22:02 PM
NO RATINGS
Clicking the "Power Tips" link under editors note at the top brings up a PDF with hyper-links. The hyper-links result in a 404 error.



Radio
NEXT UPCOMING BROADCAST
In conjunction with unveiling of EE Times’ Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. One of Silicon Valley's great contributions to the world has been the demonstration of how the application of entrepreneurship and venture capital to electronics and semiconductor hardware can create wealth with developments in semiconductors, displays, design automation, MEMS and across the breadth of hardware developments. But in recent years concerns have been raised that traditional venture capital has turned its back on hardware-related startups in favor of software and Internet applications and services. Panelists from incubators join Peter Clarke in debate.
Flash Poll
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...