ceramic cap markings

[Paul Burridge]

Hi,

If the black-tipped ceramics indicate NPO., what is signified by the
orange-tipped and yellow-tipped varieties?

p
--

The BBC: Licensed at public expense to spread lies.

 

[Tim Wescott]

"Paul Burridge" <pb@osiris1.notthisbit.co.uk> wrote in message
news:ajt5601q7grnftqubvhaj2vlik45p9ck9e@4ax.com...

Hi,

If the black-tipped ceramics indicate NPO., what is signified by the
orange-tipped and yellow-tipped varieties?

p
--

The BBC: Licensed at public expense to spread lies.

Gay manufacturing engineers?

 

[legg]

On Thu, 25 Mar 2004 15:12:14 +0000, Paul Burridge
<pb@osiris1.notthisbit.co.uk> wrote:

Hi,

If the black-tipped ceramics indicate NPO., what is signified by the
orange-tipped and yellow-tipped varieties?

p

Tempco is an IEC and EIA recommendation

Class1 Temperature compensating types

black NPO
red N80
orange N150
yellow N220
green N330
blue N470
violet N750
gray N1500-P150
white N1000-P350

Philips - other indicators
red/violet P100
orange/orange N1500


Class2 General types

green -20 +80%
yellow 10%
blue -20 +50%

RL

 

[Roy Lewallen]

On a "dog bone" capacitor, orange = N150 (-150 ppm/degree C nominal
temco) and yellow = N220. These are handy for compensating for the small
temperature drift of a good toroidal VFO inductor wound on type 6
powdered iron, by using NPO for most of the tank capacitance, and N150
or N220 for the rest.

Roy Lewallen, W7EL

Paul Burridge wrote:

Hi,

If the black-tipped ceramics indicate NPO., what is signified by the
orange-tipped and yellow-tipped varieties?

p

 

[Walter Harley]

"legg" <legg@nospam.magma.ca> wrote in message
news:gjd6601janjdn04bchm7tkqq7p1ftcf7oi@4ax.com...

Tempco is an IEC and EIA recommendation

Class1 Temperature compensating types

black NPO
[snip rainbow...]

Hey, that's nice!

But my parts bins are full of caps that don't correspond to those, so I'm
not sure how much Paul ought to trust it. How recently did that IEC
recommendation come about?

 

[R.Legg]

"Walter Harley" <walterh@cafewalterNOSPAM.com> wrote in message news:<c3vrl6$7nu$0@216.39.172.65>...

"legg" <legg@nospam.magma.ca> wrote in message
news:gjd6601janjdn04bchm7tkqq7p1ftcf7oi@4ax.com...
Tempco is an IEC and EIA recommendation

Class1 Temperature compensating types

black NPO
[snip rainbow...]

Hey, that's nice!

But my parts bins are full of caps that don't correspond to those, so I'm
not sure how much Paul ought to trust it. How recently did that IEC
recommendation come about?

You'd have to check on the history yourself, ( http://web.ansi.org/
)but I'm pretty sure the varying standards were coordinated, under
economic pressure, after WWII. The values are cribbed from a reprint
of a table from 'Reference Data for Engineers' (probably an older
SAM's edition) , quoting:

EIA Standard RS-198-B (ANSI C83.4-1972)

the pages are available at

http://www.seas.gwu.edu/~ecelabs/appnotes/PDF/refdata/page3.pdf
http://www.seas.gwu.edu/~ecelabs/appnotes/PDF/refdata/page1.pdf

With the advent of integration and smt, you ought to get used to
keeping parts out of 'piles'. Once they have left their carriers,
their origin, composition and quality will unlikely be sufficiently
discernible to actually use them in subsequent work.

RL

 

[legg]

On Thu, 25 Mar 2004 15:12:14 +0000, Paul Burridge
<pb@osiris1.notthisbit.co.uk> wrote:

Hi,

If the black-tipped ceramics indicate NPO., what is signified by the
orange-tipped and yellow-tipped varieties?

p

It goes 'without saying', that you should always consult the mfr's
data sheet to see if, and how, a standard colour code is being
applied.

The little square commercial plate ceramics are most commonly of the
Philips stamp and will follow their original recipe. At the moment, I
think they are floating around in the Vishay Beyschlag BCE corporate
mess. You'll not find them through the actual Vishay website.

http://www.angliac.com/product_guide/caps/128_129.pdf

 

[Walter Harley]

"R.Legg" <legg@magma.ca> wrote in message
news:e715b5cc.0403252216.57263e1a@posting.google.com...

With the advent of integration and smt, you ought to get used to
keeping parts out of 'piles'. Once they have left their carriers,
their origin, composition and quality will unlikely be sufficiently
discernible to actually use them in subsequent work.

Amen to that... I do my best to keep SMT parts with their original
packaging when possible. They're useless otherwise.

My non-SMT capacitors basically fall into two groups: ones I know the
provenance of, and ones that came from surplus etc. The former group I keep
pretty well organized.

Having spent all day trying to fix the SMPS from an expensive piece of
satellite gear, I'm plenty peeved at SMT markings already It used to be
pretty easy to work on things without a schematic; now it's nearly hopeless.

Thanks for the good info.

 

[Paul Burridge]

On Fri, 26 Mar 2004 07:12:58 GMT, legg <legg@nospam.magma.ca> wrote:

On Thu, 25 Mar 2004 15:12:14 +0000, Paul Burridge
pb@osiris1.notthisbit.co.uk> wrote:

Hi,

If the black-tipped ceramics indicate NPO., what is signified by the
orange-tipped and yellow-tipped varieties?

p

It goes 'without saying', that you should always consult the mfr's
data sheet to see if, and how, a standard colour code is being
applied.

The little square commercial plate ceramics are most commonly of the
Philips stamp and will follow their original recipe. At the moment, I
think they are floating around in the Vishay Beyschlag BCE corporate
mess. You'll not find them through the actual Vishay website.

So what's the best course of action when tempco is important? I can
only think of sticking the cap in a bridge and checking for any change
in value when a hot soldering iron is shoved under it. Is that
feasible? (works for diodes!)
--

The BBC: Licensed at public expense to spread lies.

 

[R.Legg]

Paul Burridge <pb@osiris1.notthisbit.co.uk> wrote in message >news:<r4u760pmavgvqf97cmbb6fse10tk69e1gi@4ax.com>...

So what's the best course of action when tempco is important? I can
only think of sticking the cap in a bridge and checking for any change
in value when a hot soldering iron is shoved under it. Is that
feasible? (works for diodes!)

It will depend on the application.

Aren't too many requiring a drift - the aim is usually to remove it. A
fixed drift, in effect, is often easier to enforce with other passive
devices. It will obviously become apparently more so, if the smd
versions of the old classII compensation ceramic capacitors are
non-existent for use in processes that proscribe through-hole.

As with the semiconductor application, relative or differential
techniques, where two parts drift by similar or differing degrees,
provides either the required apparent stability or the intermediate
drift effects.

Hence the previously unnaturally frequent occurrance of the N1500
tempco, which could mimic all tempco's in that direction through the
simple technique of paralleling with an NPO.

Nobody's bitching about the lack of smd polystyrene - a dielectric
that could once be used to compensate for ferrite tempcos. If you can
get by with .01 Z5U parts only, they'll pin a medal on you. Just do
the job another way.

RL