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| 型号： | T242B105J050PSC |
| 厂商： | KEMET Corporation |
| 英文描述： | Machine Insertable DIP Switches |
| 中文描述： | 钽密封/轴流 |
| 文件页数： | 77/84页 |
| 文件大小： | 590K |
| 代理商： | T242B105J050PSC |
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1.
Dissipated power must not exceed the limits
specified for the Series.
2.
The positive peak AC voltage plus the DC voltage
must not exceed the maximum working voltage permitted
at the ambient temperature.
3.
The negative peak AC voltage, in combination
with the DC voltage, must not exceed the permissible
reverse voltage at the ambient temperature.
The rms ripple voltage limitation imposed by power
dissipation is given by:
P= I2R=
where: I = rms ripple current (amperes)
E = rms ripple voltage (volts)
P = power (watts)
Z = impedance at specified frequency
(ohms)
R = equivalent series resistance at
specified frequency (ohms)
Maximum allowable rms ripple voltage may be
determined as follows:
E(max) @
25°C=Z
E(max)
=
85°C=0.9 E(max) @ 25°C
E(max) @
125°C=0.4 E(max) @ 25°C
P(max)
=
maximum watts shown on
Performance Characteristic pages 5,
42, 49, 58 and 61.
Permissible AC ripple current can be determined by
the following:
I rms =
If two polar capacitors are connected back-to-back,
(1) the pair may be operated on AC without need for DC
bias. The first two criteria above must be observed. If DC
is applied, the sum of DC and peak AC must not exceed,
in either direction, the maximum working voltage specified
for the ambient temperature.
(1) Some KEMET Series provide convenient assemblies of
non-polar pairs. The two negative terminals are connected
internally. It is also permissible to connect the two positive
terminals to form a non-polar pair.
14. LONG-TERM STABILITY
Within the general class of electrolytic capacitors,
solid tantalum capacitors offer unusual stability of the three
important parameters: capacitance, dissipation factor, and
leakage current. These solid-state devices are not subject
to the effects of electrolysis, deforming or drying-out asso-
ciated with liquid-electrolyte capacitors.
When stabilized for measurement at standard condi-
tions, capacitance will typically change less than ±3% dur-
ing a 10,000 hour life test +85° C. The same comparative
change has been observed in shelf tests at +25° C extend-
ing for 50,000 hours. (Some of this change may stem from
instrument or fixture error.)
Dissipation factor exhibits no typical trend. Data from
10,000 hour life tests at +85° C show that initial limits (at
standard conditions) are not exceeded at the conclusion of
these tests.
Leakage current is more variable than capacitance or
DF; in fact, leakage current typically exhibits a logarithmic
dependence in several respects. MIL-C-39003/1 permits
leakage current (measured at standard conditions) to rise
by a factor of four over 10,000 hour life tests. Typical
behavior shows a lower rate of change, which may be
negative or positive. Initial leakage currents are frequently
so low (less than 0.1 nanoampere in the smallest CV
capacitors, to about 10 microampere in the largest CV
types) that changes of several orders of magnitude have
no discernable effect on the usual circuit designs.
15. FAILURE MODE
Capacitor failure may be induced by exceeding the
rated conditions of forward DC voltage, reverse DC volt-
age, surge voltage, surge current, power dissipation, or
temperature. As with any practical device, these capaci-
tors also possess an inherent, although low, failure rate
when operated within the rated condition.
The dominant failure mode is by short-circuit. Minor
parametric drifts (see Section 14 “Long-Term Stability”) are
of no consequence in circuits suitable for solid tantalum
capacitors. Catastrophic failure occurs as an avalanche in
DC leakage current over a short (millisecond) time span.
The failed capacitor, while called “short-circuited”, may
exhibit a DC resistance of 10 to 104 ohm.
If a failed capacitor is in an unprotected low-imped-
ance circuit, continued flow of current through the capaci-
tor may obviously produce severe overheating. This heat
may melt the internal solder (all Series) and the sealing
solder used in hermetic Series. The short-circuit failure
may thereby be converted to an open-circuit failure. If the
circuit does not open promptly, the over-heated capacitor
may damage the circuit board or nearby components.
Protection against such occurrence is obtained by current-
limiting devices or fuses provided by the circuit design.
Fortunately, the inherent failure rate of KEMET solid
tantalum capacitors is low, and this failure rate may be fur-
ther improved by circuit design. Statistical failure rates are
provided for those capacitors with characters other than
“A” in the next-to-last position of the part number. Relating
circuit conditions to failure rate is aided by the guides in
the section following.
16. RELIABILITY PREDICTION
Three important application conditions largely control
failure rate: DC voltage, temperature, and circuit imped-
ance. Estimates of the respective effects are provided by
the nomograph in Figure 12 and Table 3 following. The
nomograph related failure rate to voltage and temperature
while the table relates failure rate to impedance. These
estimates apply to steady-state DC conditions, and they
assume usage within all other rated conditions.
Standard conditions, which produce a unity failure
rate factor, are rated voltage, +85° C, and 0.1 ohm-per-volt
circuit impedance. While voltage and temperature are
straightforward there is sometimes difficulty in determining
impedance. What is required is the circuit impedance seen
by the capacitor. If several capacitors are connected in
parallel, the impedance seen by each is lowered by the
source of energy stored in the other capacitors. Energy is
similarly stored in series inductors.
Failure rate is conventionally expressed in units of
percent per thousand hours. As a sample calculation, sup-
pose a particular batch of capacitors has a failure rate of
0.5% Khr under standard conditions. What would be pre-
dicted failure rate at 0.7 times rated voltage, +60° C and
0.8
/V? The nomograph gives a factor of 7 x 10-4, and the
table gives a factor of 0.3. The failure rate estimate is then:
0.5 x 7 x10-4 x 0.3 = 1.05 x 10-4, or 0.0001% Khr
P(max)
R
E2R
Z2
KEMET
APPLICATION NOTES FOR TANTALUM CAPACITORS
T
a
ntalum
Application
Notes
KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606 (864) 963-6300
79
P(max)
R
√
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| T242B105K050BSC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
| T242B105K050CSC | 制造商:KEMET 制造商全称:Kemet Corporation 功能描述:TANTALUM HERMETICALLY SEALED / AXIAL |
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