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0603J2001P80DAR 参数 Datasheet PDF下载

0603J2001P80DAR图片预览
型号: 0603J2001P80DAR
PDF下载: 下载PDF文件 查看货源
内容描述: [CAP CER 1.8PF 200V C0G/NP0 0603]
分类和应用:
文件页数/大小: 48 页 / 5611 K
品牌: KNOWLES [ KNOWLES ELECTRONICS ]
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Explanation of Aging of MLC  
CAPACITANCE MEASUREMENTS  
AGING  
Because of aging it is necessary to specify an age for reference  
measurements at which the capacitance shall be within the prescribed  
tolerance. This is fixed at 1,000 hours, since for practical purposes there is  
not much further loss of capacitance after this time.  
Capacitor aging is a term used to describe the negative, logarithmic capacitance  
change that takes place in ceramic capacitors with time. The crystalline structure  
for barium titanate based ceramics changes on passing through its Curie  
temperature (known as the Curie Point, at about 125°C. This domain structure  
relaxes with time and in doing so, the dielectric constant reduces logarithmically;  
this is known as the aging mechanism of the dielectric constant. The more stable  
dielectrics have the lowest aging rates.  
All capacitors shipped are within their specified tolerance at the  
standard reference age of 1,000 hours after having cooled through  
their Curie temperature.  
The aging process is reversible and repeatable. Whenever the capacitor is heated  
to a temperature above the Curie Point, the aging process starts again from zero.  
The aging curve for any ceramic dielectric is a straight line when  
plotted on semi-log paper.  
The aging constant, or aging rate, is defined as the percentage loss of  
capacitance due to the aging process of the dielectric that occurs during a  
decade of time (a tenfold increase in age) and is expressed as percent per  
logarithmic decade of hours. As the law of decrease of capacitance is logarithmic,  
this means that in a capacitor with an aging rate of 1ꢀ per decade of time, the  
capacitance will decrease at a rate of:  
CAPACITANCE vs. TIME  
(Aging X7R (2R1) @ <2ꢀ per decade)  
Standard reference time  
24  
20  
a) 1ꢀ between 1 and 10 hours  
16  
12  
8
b) An additional 1ꢀ between the following 10 and 100 hours  
c) An additional 1ꢀ between the following 100 and 1,000 hours  
d) An additional 1ꢀ between the following 1,000 and 10,000 hours, etc.  
e) The aging rate continues in this manner throughout the capacitor’s life.  
C0G/NP0 (1B)  
4
0
X7R (2R1)  
1,000  
Typical values of the aging constant for our Multilayer Ceramic Capacitors  
are:  
-4  
10,000  
0.1  
1
10  
100  
Age (Hours)  
Dielectric class  
Typical values  
TIGHT TOLERANCE  
Ultra Stable C0G/NP0 (1B)  
Stable X7R (2R1)  
Negligible capacitance loss through aging  
<2ꢀ per decade of time  
One of the advantages of Knowles’ unique “wet process” of  
manufacture is the ability to offer capacitors with exceptionally tight  
capacitance tolerances.  
The accuracy of the printing screens used in the fully automated,  
computer controlled manufacturing process allows for tolerance as  
close as +/-1ꢀ on C0G/NP0 (1B) parts greater than or equal to 10pF. For  
capacitance values below <4.7pF, tolerances can be as tight as +/-0.05pF.  
12  
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