# 2200uF 100V COG ceramic for under 10 cents

J

#### Jeff L

Jan 1, 1970
0
Apparently Digikey sells one. Part number:

B37986G1222J051

It's actually a 2200 pF cap, but I wonder how long till that size ceramic
caps are available. At the rate ceramic cap development is going with the
new dielectrics, it won't be too far off.

Digikey should give a discount or something (to a maximum of a reasonable
value) for reporting such gross errors.

M

#### MooseFET

Jan 1, 1970
0
Apparently Digikey sells one. Part number:

B37986G1222J051

It's actually a 2200 pF cap, but I wonder how long till that size ceramic
caps are available. At the rate ceramic cap development is going with the
new dielectrics, it won't be too far off.

It won't be an NPO/COG. All of the high K ceramics are temperature
dependant, nonlinear and piezo-electric. They are fine in cases where
the exact value doesn't matter much but they can't be used for good
filters or accurate timers.

W

#### Winfield

Jan 1, 1970
0
MooseFET said:
It won't be an NPO/COG. All of the high K ceramics are
temperature dependant, nonlinear and piezo-electric. They
are fine in cases where the exact value doesn't matter much
but they can't be used for good filters or accurate timers.

The EPCOS 2200pF 100V is an honest C0G cap, with a low
tempco, and presumably low DA as well, see page 9:
As for another factor of 10, let alone 100 or 1000...

DigiKey's highest value is 0.01uF 50V, # B37986G5103J054,
1620 pieces in stock for $0.36 or$0.28, qty 10 or 100.
http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=495&M=B37986G5103J054

M

#### MooseFET

Jan 1, 1970
0
I was refering to the value in the title. I guess I should have been
a bit clearer.

BTW: We get 0.01u NPOs so 2200pF isn't at the extreme anymore.

R

#### Robert Baer

Jan 1, 1970
0
Jeff said:
Apparently Digikey sells one. Part number:

B37986G1222J051

It's actually a 2200 pF cap, but I wonder how long till that size ceramic
caps are available. At the rate ceramic cap development is going with the
new dielectrics, it won't be too far off.

Digikey should give a discount or something (to a maximum of a reasonable
value) for reporting such gross errors.
New materials are far from c0G capability...

R

#### Robert Baer

Jan 1, 1970
0
Winfield said:
The EPCOS 2200pF 100V is an honest C0G cap, with a low
tempco, and presumably low DA as well, see page 9:
As for another factor of 10, let alone 100 or 1000...

DigiKey's highest value is 0.01uF 50V, # B37986G5103J054,
1620 pieces in stock for $0.36 or$0.28, qty 10 or 100.
http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=495&M=B37986G5103J054
All i could find for NPO in DigiKey was their PCC2167 (1206 0.01uF
@50V), their 490-1765 (1206 0.082uF @50V), and the 490-1767 (1206 0.1uF
@25V).
If one does not care about the dielectric but still wants a "low" TC,
their 490-1941 gives us 2220 in X7R at 4.7uF, 50V 10%.
Not too shabby..

E

#### Eugene Rice

Jan 1, 1970
0
Robert said:
New materials are far from c0G capability...

Is the "0" in C0G a zero or an oh?

M

Jan 1, 1970
0
J

#### [email protected]

Jan 1, 1970
0
Apparently Digikey sells one. Part number:

B37986G1222J051

It's actually a 2200 pF cap, but I wonder how long till that size ceramic
caps are available. At the rate ceramic cap development is going with the
new dielectrics, it won't be too far off.

Digikey should give a discount or something (to a maximum of a reasonable
value) for reporting such gross errors.

So yesterday, having specially wound 2 off T50-3 toroids with 80 turns
each (losing the will to live in the process), I assembled the
bandpass filter using 220pF ceramics from the drawer. Toroid Q's
measured in at a nice 280.
Swept the filter. Near useless, 20dB loss. 'Twas the damned ceramic
caps. Turned out their Q's were a useless '30'. Checked the drawers
and all the ceramics >100pF were crappy medium K with 30ish Qs.
Originally bought in as nice low K-NPO-COG types.

Yes please. Bigger COG/NPO/Lo K caps (and bought in inductors). Sod
they be moulded in a different body colour?. And could Farnell please
stock 'em in values greater than 330pF.

M

Jan 1, 1970
0
M

#### Michael A. Terrell

Jan 1, 1970
0
MooseFET said:
Yes, that does seem to be the standard. Out in the rest of the world
however, it appears that it is written with a oh more often than not.
cog capacitor gets more than twice the google hits of c0g capacitor.

SO? DB9 gets a lot more hits than DE9, but its still wrong.

Results 1 - 100 of about 575,000 for DB9 connector. (0.40 seconds)
Results 1 - 100 of about 10,400 for DE9 connector. (0.32 seconds)

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

T

#### Tom Bruhns

Jan 1, 1970
0
The EPCOS 2200pF 100V is an honest C0G cap, with a low
tempco, and presumably low DA as well, see page 9:
As for another factor of 10, let alone 100 or 1000...

DigiKey's highest value is 0.01uF 50V, # B37986G5103J054,
1620 pieces in stock for $0.36 or$0.28, qty 10 or 100.
http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=495&M=B379...

I recall Bob Pease mentioning that DigiKey sells rather much larger
C0G values than that for reasonable prices, so now it's a challenge to
find what the largest really is...
it took well under a minute to find 445-2709-1, 0.22uF 50V, but none
in stock at the moment. On the other hand, 445-2708-1, 0.15uF 50V, is
in stock. It's an 1812 size SMT part, not too bad for size. The data
sheet suggests a volume that yields about 450 parts per cubic inch, so
you could get about 68uF at 50V per cubic inch, for about $400. Quantity drops the price pretty quickly, so you can get 330uF/50V for about$1500.

Cheers,
Tom

J

#### John Popelish

Jan 1, 1970
0
MooseFET said:
Yes, that does seem to be the standard. Out in the rest of the world
however, it appears that it is written with a oh more often than not.
cog capacitor gets more than twice the google hits of c0g capacitor.

Lots of people say oh when they mean zero when saying the
digits of a number. That doesn't make them right, but it is
something to understand that is a common practice.

M

#### MooseFET

Jan 1, 1970
0
SO? DB9 gets a lot more hits than DE9, but its still wrong.

Results 1 - 100 of about 575,000 for DB9 connector. (0.40 seconds)
Results 1 - 100 of about 10,400 for DE9 connector. (0.32 seconds)

The purpose of language is to communicate. The DB9 case is a classic
example of how the language evolves. Assuming we are still using the
DE9 in a few more decades, everyone will call it "DB9" so if you want
them to understand you, you'd have to say "DB9"

S

#### Spehro Pefhany

Jan 1, 1970
0
SO? DB9 gets a lot more hits than DE9, but its still wrong.

Results 1 - 100 of about 575,000 for DB9 connector. (0.40 seconds)
Results 1 - 100 of about 10,400 for DE9 connector. (0.32 seconds)

Best regards,
Spehro Pefhany

R

#### Robert Baer

Jan 1, 1970
0
Eugene said:
Is the "0" in C0G a zero or an oh?
I believe it is a zero...for zero TC.

M

#### Michael A. Terrell

Jan 1, 1970
0
MooseFET said:
The purpose of language is to communicate. The DB9 case is a classic
example of how the language evolves. Assuming we are still using the
DE9 in a few more decades, everyone will call it "DB9" so if you want
them to understand you, you'd have to say "DB9"

I don't care if "They" understand. The part number is DE-9 from any
reputable manufacturer or distributor.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

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