Author Topic: SMD Electrolytic capacitor markings  (Read 1857 times)

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Offline will_raymo2000

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SMD Electrolytic capacitor markings
« on: January 12, 2017, 03:48:56 pm »
Trying to repair a faulty USB soundcard and I suspect a couple of filtering capacitors have given up the ghost. They are surface mount electrolytics with the following markings:
100
6S
E74

I'm guessing 100uF but not 100% sure.

Any help appreciated thanks!
 

Offline Cupcakus

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Re: SMD Electrolytic capacitor markings
« Reply #1 on: January 13, 2017, 08:45:05 am »
Every manufacturer uses different markings so it's hard to know for sure, but with those marks it should be 100uF 6.3V
 

Offline German_EE

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Re: SMD Electrolytic capacitor markings
« Reply #2 on: January 15, 2017, 10:34:27 am »
One other thing to note (one of those fabled traps for young players).

A through-hole electrolytic capacitor has the 'band' next to the negative lead

An SMD wet electrolytic in a round can also has the black mark next to the negative lead

An SMD tantalum electrolytic in a plastic case has the mark next to the POSITIVE lead.
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Warren Buffett
 

Offline Howardlong

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Re: SMD Electrolytic capacitor markings
« Reply #3 on: January 15, 2017, 01:46:56 pm »
An SMD tantalum electrolytic in a plastic case has the mark next to the POSITIVE lead.

I wonder (a) what they were thinking and (b) how many of us found that out the hard way?
 

Offline German_EE

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Re: SMD Electrolytic capacitor markings
« Reply #4 on: January 15, 2017, 07:33:11 pm »
(b) how many of us found that out the hard way?

Count me among their number which is why I passed the information on, learn from my mistakes.
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Warren Buffett
 

Offline will_raymo2000

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Re: SMD Electrolytic capacitor markings
« Reply #5 on: January 15, 2017, 09:24:03 pm »
Just to follow up on this... I replaced it with a 100uf radial capacitor with the leads bent to fit the pads and it didn't work. Replaced that with a 10uf and voila, it worked perfectly.

Still got a very high frequency (audible) whine from something in the power section but it is markedly lower having replaced a couple of these capacitors.
 


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