Is this SMD Metallized Polyester Film Cap any good?

Brian Guralnick · 2nd October 2003, 01:08 PM

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

peranders · 2nd October 2003, 01:16 PM

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.

Brian Guralnick · 2nd October 2003, 02:09 PM

Thanks.

liz · 2nd October 2003, 03:43 PM

I'd stick to SMT wherever possible, in order to minimise lead inductance. Plus it will give you more flexibility in terms of layout.

peranders · 2nd October 2003, 05:03 PM

One disadvantage may be not so many types or values otherwise only positive things, except for heat resistance in industrial soldering (oven).

Brian Guralnick · 2nd October 2003, 05:44 PM

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.

peranders · 2nd October 2003, 07:09 PM

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.

Brian Guralnick · 2nd October 2003, 09:47 PM

How do you feel about SMD mica caps?

peranders · 3rd October 2003, 06:16 AM

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.

markp · 10th October 2003, 05:52 PM

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.

2nd October 2003, 01:08 PM	#1
Brian Guralnick diyAudio Member Join Date: Mar 2002 Location: Montreal, Quebec, Canada	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 __________________ _______ Brian

2nd October 2003, 01:16 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

2nd October 2003, 02:09 PM	#3
Brian Guralnick diyAudio Member Join Date: Mar 2002 Location: Montreal, Quebec, Canada	Thanks. __________________ _______ Brian

2nd October 2003, 05:03 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	One disadvantage may be not so many types or values otherwise only positive things, except for heat resistance in industrial soldering (oven). __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

2nd October 2003, 05:44 PM	#6
Brian Guralnick diyAudio Member Join Date: Mar 2002 Location: Montreal, Quebec, Canada	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. __________________ _______ Brian


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2nd October 2003, 03:43 PM	#4
liz diyAudio Member Join Date: Sep 2003 Location: Edinburgh	I'd stick to SMT wherever possible, in order to minimise lead inductance. Plus it will give you more flexibility in terms of layout.

2nd October 2003, 07:09 PM	#7
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

2nd October 2003, 09:47 PM	#8
Brian Guralnick diyAudio Member Join Date: Mar 2002 Location: Montreal, Quebec, Canada	How do you feel about SMD mica caps? __________________ _______ Brian

3rd October 2003, 06:16 AM	#9
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

10th October 2003, 05:52 PM	#10
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	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. __________________ If it sounds good... it is good!

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