8 Jan
2002
8 Jan
'02
2:55 a.m.
On Tue, 8 Jan 2002, Pat Finnegan wrote:
On Tue, 8 Jan 2002, Kent Borg wrote:
A few minor additions
pf = 10^-12 F (10 ^-9 uF)
Z probably stands for Z5U - the particular dielectric used. Z5U is a very
temperature unstable material but with a high dielectric constant, often
used for bypasses. Its so unstable that if you make an audio oscillator
with a Z5U capacitor determining the frequency, you can hear the pitch
change by just warming the capacitor with your finger...
X7R is a newer, somewhat more temperature stable material used for
bypasses.
Peter Wallace
The voltage is something you merely need to meet,
exceeding it is OK.
Assuming everything else matches, I'd go with the "104Z at 50V".
-kb
Quick lesson in capacitor markings:
The number '104' indicates the capacitance, with the first two digits
'10'
being the 'mantissa' or value and the last digit being the exponent.
Ceramic (and other caps marked like this) are all rated in pF or 10^-9 F.
Therefore, this cap is 10x10^4pF or 100,000pF, or 0.10uF. The other
capacitor, 224Z, would be 0.22uF (22x10^4pF). The 'Z' specifies a
temperature range (IIRC) or something else that is not terribly important
for most applications.
-- Pat