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| 型号： | T242B105J050DSC |
| 厂商： | KEMET Corporation |
| 英文描述： | TANTALUM HERMETICALLY SEALED / AXIAL |
| 中文描述： | 钽密封/轴流 |
| 文件页数： | 74/84页 |
| 文件大小： | 590K |
| 代理商： | T242B105J050DSC |
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Capacitance typically changes with temperature
according to the curve of Figure 2.
6. DISSIPATION FACTOR (DF)
DF is measured at 120 Hz and 25° C with up to 1 volt
rms applied. Note that, in either operation, peak AC plus
DC bias must not exceed either rated voltage (normally
polarized) or 15% of rated voltage in the reverse direction
at 25°C. Measurement circuits are of high impedance,
however, and under these conditions 1 volt rms may be
applied even to 6 volt capacitors (23% peak reversal) with-
out a DC bias. DC bias is thus normally not used, except
when rated voltage is below 6 volts and the AC signal level
exceeds 0.3 vrms. However, MIL-C-39003 provides for up
to 2.2 volts DC.
Dissipation Factor (DF) is a useful low-frequency
measure of the resistive component in capacitors. It is the
ratio of the unavoidable resistance to the capacitive reac-
tance, usually expressed in percent. DF increases with
temperature above +25° C and may also increase at lower
temperatures. Unfortunately, one general limit for DF can-
not be specified for all capacitance/voltage combinations,
nor can response to temperature be simply stated.
Catalogs for the respective series list DF limits under var-
ious conditions.
Dissipation factor increases with increasing frequen-
cy as would be expected from the decreasing capacitive
reactance. DF is not a very useful parameter above about
1 kHz. The DF of larger capacitance values increases
more rapidly than that of smaller ratings. Figure 3 shows
typical effect of frequency on DF.
DC bias causes a small reduction in capacitance, up
to about 2% when full rated voltage is applied, as bias. DF
is also reduced by the presence of DC bias. Rated voltage
may cause a decrease in DF of about 0.2% (e.g., a
decrease from 3.6 to 3.4% DF).
DF is defined as
and is also referred to occa-
sionally, as tan d or “loss tangent.” The “Quality
Factor,” Q, is the reciprocal of DF (DF is not expressed in
percent in this calculation). Another expression, rarely
used, is the “power factor,” or
.
Power factor is cos u,
while DF is ctn u.
7. DC LEAKAGE (DCL)
DC leakage is affected by voltage to a much larger
extent, and this effect can frequently be used to advantage
in circuits where only very low leakage currents can be tol-
erated. Typical response of DCL to applied voltage is illus-
trated in Figure 4.
DC leakage current (DCL) increases with increasing
temperature according to the typical curve of Figure 5.
Leakage current is measured at a rated voltage
through +85°C and may also be measured at +125°C with
2/3 of rated voltage applied.
8. RATED VOLTAGE
This term refers to the maximum continuous DC
working voltage permissible at temperatures of +85° C or
below. The lower operating temperature is specified as
-55° C. Operation above +85° C is permissible, with
reduced working voltage. Typical working voltage reduc-
tion is to 2/3 of rated voltage at +125° C.
ESR
c
KEMET
APPLICATION NOTES FOR TANTALUM CAPACITORS
76
KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606 (864) 963-6300
+20
+10
0
-10
-20
Capacitance
V
a
lue
-80
-60 -40 -20
0 +20 +40 +60 +80 +100 +120
Operating Temperature
°C
Figure 2.
Typical Effect of Temperature upon Capacitance
1.0
10.0
20.0
Multiplier
of
120
Hz
D.
F
.
100
1K
10K
Frequency - Hertz
Figure 3.
Normal Effect of Frequency upon
Dissipation Factor
Multiplier
of
DC
Leakage
Current
10.0
1.0
0.1
Operating Temperature –C
-60 -40 -20
0
+20 +40 +60 +80 +100 +125
Reference 1.0
at + 25
°C
Multiplier
of
DC
Leakage
Current
Temperature -
°C
Typical Range of DC Leakage as
a Function of Applied Voltage
100 110
90
80
70
60
50
40
30
20
10
0
0.0001
0.01
0.1
1.0
Figure 4.
Figure 5.
Typical Effect of Temperature
upon DC Leakage Current
Multiplier
of
DC
Leakage
Current
Percentage of Rated Voltage
0
102030405060708090
100
110
1.0
0.1
0.01
0.001
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相关代理商/技术参数 |
参数描述 |
|---|---|
| T242B105J050MSC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
| T242B105J050PSC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
| T242B105J050RSC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
| T242B105J050SSC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
| T242B105K050ASC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
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