Is this SMD Metallized Polyester Film Cap any good? - diyAudio
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Old 2nd October 2003, 01:08 PM   #1
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Default Is this SMD Metallized Polyester Film Cap any good?

I' been told that Film caps are the best.

I've finally found a reasonably low priced 10uF, 30VAC SMD Metallized Polyester Film Cap from Vishay. It's for a DC filter at the line input stage of my amp. It's output load is 100k. Is it any good? Should I still search for better Film caps?

ds link > http://www.vishay.com/docs/26059/mkt1804.pdf

Maybe I'm better off with a through-hole box style. 10uF, 40VAC.

ds link > http://www.vishay.com/docs/26011/mkt1820.pdf
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Old 2nd October 2003, 01:16 PM   #2
Electrons are yellow and more is better!
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Polyester is polyester, not bad at all. You could try PPS, polyphenylsulphide (not sure about the spelling).
http://www.elfa.se/elfa/produkter/se/5008.htm
I'm not sure if 10 uF is available.

Check C1 och C11 at the picture
http://home5.swipnet.se/~w-50674/hif...r0_topview.jpg

I'm quite pleased with them.
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Old 2nd October 2003, 02:09 PM   #3
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Thanks.
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Old 2nd October 2003, 03:43 PM   #4
liz is offline liz  United Kingdom
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I'd stick to SMT wherever possible, in order to minimise lead inductance. Plus it will give you more flexibility in terms of layout.
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Old 2nd October 2003, 05:03 PM   #5
Electrons are yellow and more is better!
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One disadvantage may be not so many types or values otherwise only positive things, except for heat resistance in industrial soldering (oven).
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Old 2nd October 2003, 05:44 PM   #6
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Ok, do I have these cap in correct order by quality?

Metallized polyester (PET) SMD Film Caps. Basic foil quality.

Metallized polyethylene naphthalate (PEN) SMD Film Caps - Higher quality.

Metallized polyphenylene sulphide (PPS) SMD Film Caps - Highest quality.
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Old 2nd October 2003, 07:09 PM   #7
Electrons are yellow and more is better!
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Something like that but plastic SMD caps are difficult to make resist high temperature. This is also a "quality" aspect. Good electrical data but hopeless to solder, not very high "quality". Put a pcb in oven 250 deg C warm or warmer is something else compared to ordinary wave soldering. But if you shall do the soldering by hand you can disregard this temperature thing.
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Old 2nd October 2003, 09:47 PM   #8
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How do you feel about SMD mica caps?
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Old 3rd October 2003, 06:16 AM   #9
Electrons are yellow and more is better!
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If you are asking me: I don't know because the only plastic cap I have used so far is PPS EVOX RIFA. At work I avoid plastic. I haven't had yet a single really sensistive application which demands plastic caps.
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Old 10th October 2003, 05:52 PM   #10
markp is offline markp  United States
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Try to avoid smd mica or ceramic caps as they get stressed under expansion/contraction of the pcb during temp changes and can change in weird ways, like piezo effects. The very minimal inductance of a straight piece of wire is moot. IMO I'd always go with through hole caps. Also, film and foil is generally better than metallized but much more money.
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