What voltage caps ?

P

Phil Allison

Guest
** See ABSE for pic of some ceramic caps.

Marked as " 470 " & " M750 " = 470pF and 750ppm.

Reddish orange in colour, dimensions = 10mm x 10mm x 2mm.

Probably sourced from an Australian supplier a few years back.

What is the voltage rating and how do you tell ?




..... Phil
 
Phil Allison wrote:
** See ABSE for pic of some ceramic caps.

Marked as " 470 " & " M750 " = 470pF and 750ppm.

Reddish orange in colour, dimensions = 10mm x 10mm x 2mm.

Probably sourced from an Australian supplier a few years back.

What is the voltage rating and how do you tell ?




.... Phil
Click to expand...
I thought that M might be the tolerance code (M = +/-20%) and 7 possibly the
material code. This leaves the '50' as the voltage rating of 50V.
 
"swanny"
Phil Allison wrote:
** See ABSE for pic of some ceramic caps.

Marked as " 470 " & " M750 " = 470pF and 750ppm.

Reddish orange in colour, dimensions = 10mm x 10mm x 2mm.

Probably sourced from an Australian supplier a few years back.

What is the voltage rating and how do you tell ?


I thought that M might be the tolerance code (M = +/-20%) and 7 possibly
the
material code. This leaves the '50' as the voltage rating of 50V.
Click to expand...

** The cap exhibits a negative tempco of about 750ppm.

M might just stand for "minus".

The colour is the only clue left for voltage.




...... Phil
 
"MisterE"

it must be 470pF and +/-20% 750V. I find it hard to believe it has 750ppm
per degree,
Click to expand...

** Better go look up " temperature compensating ceramic capacitors " on
Google.

Bit old hat for the uP, MP3 and IT generation - I know.


what is it from?
Click to expand...

** Did you see the pic?



...... Phil
 
On Thu, 14 Aug 2008 19:01:14 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> put finger to keyboard and
composed:

MisterE wrote:

it must be 470pF and +/-20% 750V.

That was my thinking too. Expected now to be slandered mercilessly.

Graham
Click to expand...
There are NPO, N150, N750, N1500 ceramic caps, for example.

N750 caps have a tempco of -750ppm/degC.

That doesn't quite gel with "M750", though.

See
http://www.libertybellinc.com/CatalogFinalPDF/FixedComponent/FixedCapacitor/CeramicDiscCapacitors/CeramicCapacitor-CDC16-100V.pdf
http://preview.tinyurl.com/6xs5zt

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On Fri, 15 Aug 2008 06:23:40 +1000, Franc Zabkar <fzabkar@iinternode.on.net>
wrote:

:On Thu, 14 Aug 2008 19:01:14 +0100, Eeyore
:<rabbitsfriendsandrelations@hotmail.com> put finger to keyboard and
:composed:
:
:>MisterE wrote:
:>
:>> it must be 470pF and +/-20% 750V.
:>
:>That was my thinking too. Expected now to be slandered mercilessly.
:>
:>Graham
:
:There are NPO, N150, N750, N1500 ceramic caps, for example.
:
:N750 caps have a tempco of -750ppm/degC.
:
:That doesn't quite gel with "M750", though.
:
:See
:http://www.libertybellinc.com/CatalogFinalPDF/FixedComponent/FixedCapacitor/CeramicDiscCapacitors/CeramicCapacitor-CDC16-100V.pdf
:http://preview.tinyurl.com/6xs5zt
:
:- Franc Zabkar

You are correct Franc. My guess is that the manufacturer chose to substitute the
N with the M since the 750 by itself infers the tempco, and since this
characteristic is invariably negative there is no need to put the N. The
substitute M is a neat way of providing the capacitance tolerance (+/-20%) while
saving extra characters in the limited space available.
 
Ross Herbert wrote:

Franc Zabkar wrote:
:Eeyore: put finger to keyboard and:composed:
:>MisterE wrote:
:
:>> it must be 470pF and +/-20% 750V.
:
:>That was my thinking too. Expected now to be slandered mercilessly.
:
:>Graham
:
:There are NPO, N150, N750, N1500 ceramic caps, for example.
:
:N750 caps have a tempco of -750ppm/degC.
:
:That doesn't quite gel with "M750", though.
:
:See
:http://www.libertybellinc.com/CatalogFinalPDF/FixedComponent/FixedCapacitor/CeramicDiscCapacitors/CeramicCapacitor-CDC16-100V.pdf
:http://preview.tinyurl.com/6xs5zt
:
:- Franc Zabkar

You are correct Franc. My guess is that the manufacturer chose to substitute the
N with the M since the 750 by itself infers the tempco, and since this
characteristic is invariably negative there is no need to put the N. The
substitute M is a neat way of providing the capacitance tolerance (+/-20%) while
saving extra characters in the limited space available.
Click to expand...
Sounds moderately convincing. Doesn't solve the voltage rating problem though.

Graham
 
On Fri, 15 Aug 2008 06:56:09 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

:
:
:Ross Herbert wrote:
:
:> Franc Zabkar wrote:
:> :Eeyore: put finger to keyboard and:composed:
:> :>MisterE wrote:
:> :>
:> :>> it must be 470pF and +/-20% 750V.
:> :>
:> :>That was my thinking too. Expected now to be slandered mercilessly.
:> :>
:> :>Graham
:> :
:> :There are NPO, N150, N750, N1500 ceramic caps, for example.
:> :
:> :N750 caps have a tempco of -750ppm/degC.
:> :
:> :That doesn't quite gel with "M750", though.
:> :
:> :See
:>
:http://www.libertybellinc.com/CatalogFinalPDF/FixedComponent/FixedCapacitor/CeramicDiscCapacitors/CeramicCapacitor-CDC16-100V.pdf
:> :http://preview.tinyurl.com/6xs5zt
:> :
:> :- Franc Zabkar
:>
:> You are correct Franc. My guess is that the manufacturer chose to substitute
the
:> N with the M since the 750 by itself infers the tempco, and since this
:> characteristic is invariably negative there is no need to put the N. The
:> substitute M is a neat way of providing the capacitance tolerance (+/-20%)
while
:> saving extra characters in the limited space available.
:
:Sounds moderately convincing. Doesn't solve the voltage rating problem though.
:
:Graham
:

Graham,
If you have been following this thread then you will note that I gave my opinion
on the voltage previously. I was simply replying to Franc on the topic of the
use of M in place of N ahead of the 750. You didn't respond to Franc's post by
saying that his post didn't solve the voltage problem so why do so with mine. If
you can't offer some constructive comment then say nothing.
 
"Ross Herbert"
Graham,
If you have been following this thread then you will note that I gave my
opinion
on the voltage previously. I was simply replying to Franc on the topic of
the
use of M in place of N ahead of the 750. You didn't respond to Franc's
post by
saying that his post didn't solve the voltage problem so why do so with
mine. If
you can't offer some constructive comment then say nothing.
Click to expand...

** Such complaints are just water off a duck's back to psychopathic
narcissists like Graham Stevenson.

Even his web page is totally vacuous:


http://www.grahamstevenson.co.uk/contact.asp

http://www.grahamstevenson.co.uk/


All bloat, no substance.




........ Phil
 
On Thu, 14 Aug 2008 19:28:19 +1000, MisterE <mistere@no.email.ok> put
finger to keyboard and composed:

I find it hard to believe it has 750ppm per degree
Click to expand...
750ppm over a range of 100degC would equate to ...

750 * 100 * 100 / 1000000 = 7.5%

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
Phil Allison wrote:
** See ABSE for pic of some ceramic caps.

Marked as " 470 " & " M750 " = 470pF and 750ppm.

Reddish orange in colour, dimensions = 10mm x 10mm x 2mm.

Probably sourced from an Australian supplier a few years back.

What is the voltage rating and how do you tell ?
Click to expand...
it must be 470pF and +/-20% 750V. I find it hard to believe it has
750ppm per degree, what is it from?
 
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