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參數(shù)資料
| 型號： | T498_1 |
| 廠商： | KEMET Corporation |
| 英文描述： | Product Update - T498 High Temperature (+150) Tantalum SMT Capacitors |
| 中文描述： | 產(chǎn)品更新- T498高溫（150）貼片鉭電容 |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 168K |
| 代理商： | T498_1 |
The carbon, conductive epoxy, and the silver paint ma-
terials were chosen for the best offerings that would allow
the device to exist in the 150°C environment without deg-
radation. The tantalum anode structure, the tantalum-
pentoxide, and the MnO
2
cathode system have been
proven to withstand this temperature exposure without
degradation.
Voltage Rating
The voltage rating of a component is fixed so as to cre-
ate an acceptable failure rate at accelerated life conditions.
Inability of a device to meet that criteria may cause the
voltage rating of the component to be reduced, or the com-
ponent to be redesigned (thicker dielectric) to allow for
that failure rate to be achieved.
Accelerated life testing of this component at 150°C and
with 2/3 nameplate voltage applied has shown the failure
rate to be less than 0.5% per thousand-piece-hours. Fail-
ures were designated by positional fuse failure or paramet-
ric shifts beyond the initial limits.
The temperature-voltage derating of this device is
slightly different from the standard tantalum SMT capaci-
tor. These devices were created using thicker dielectrics
for the voltage ratings than is required for the standard
product line.
2005 KEMET Electronics Corp.
May 2005
Figure 4. Voltage-temperature derating for standard and T498 ca-
pacitors.
For both the T498 and the standard tantalum capaci-
tors, the voltage rating up through 85°C is the same as the
nameplate voltage for the capacitor. For the standard ca-
pacitors above 85°C, the voltage rating is linearly reduced
from 100% of nameplate voltage at 85°C, down to 2/3
rd
(67%) of nameplate voltage at 125°C. For the T498 ca-
pacitors, the voltage rating is linearly reduced from 100%
of nameplate voltage at 85°C, down to 2/3
rd
(67%) of
nameplate voltage at 150°C. This allows the 125°C rating
for the T498 to be about 80% of nameplate voltage.
Application Derating
We will use the guidelines established with the long
history of the commercial tantalum product to fix the rec-
ommended application at no more than 50% of the rated
voltage. For a T498 rated at 50 VDC, this would create a
recommended application of 25 VDC. This application
would then apply up to 85°C, at which point the tempera-
ture-voltage derating requirements effectively lower the
voltage rating of the part. At 150°C, this 50 VDC has a
temperature-voltage derated rating down to 33 VDC, and
following the 50% application guides, the recommended
maximum application is the 17 VDC.
It is very important to consider the failure rate at rated
voltage and 150°C is listed as 0.5% per thousand-piece-
hours; but that application derating will allow for an ap-
preciably reduced failure rate. Using the voltage factor
calculations from MIL-HDBK-217F
3
, at rated voltage the
multiplying factor for the failure rate is 5,909. Compared
to “50% of rated” factor of 1.045, then the improvement in
failure rate at 150°C would be down from the 0.5% level
to 884 parts per billion-piece-hours. Remember though,
the rated voltage is changing with temperature as shown in
Figure 4. At temperatures up through 85°C, the recom-
mended application voltage is 50% of nameplate voltage.
Above 85°C, the recommended application voltage is 50%
of the temperature-voltage derated level. For a standard
tantalum at 125°C, the recommended application voltage
is 50% of 67%, or 33% of the nameplate voltage. For a
T498 at 125°C and 150°C, the application becomes 40%
and 33%, respectively, of nameplate voltage (Figure 5).
Figure 5. Recommended application voltages versus temperature.
Power Rating
The power rating for capacitors is reflective of the al-
lowable heat generated in the device and there is a direct
correlation between these two. Without a standard tem-
perature rise defined, the majority of manufacturers use the
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