參數資料
型號： T491C474M035AS
廠商： KEMET Corporation
英文描述： Surface Mount Capacitors
中文描述： 表面貼裝電容
文件頁數： 9/100頁
文件大?。?/td> 4351K
代理商： T491C474M035AS
SOLID TANTALUM CHIP CAPACITORS
TANTALUM MnO
2
COMPONENT PERFORMANCE CHARACTERISTICS
(con’t.)
KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300
7
S
FIGURE 4
Typical Effect of Temperature upon
DC Leakage Current
DC leakage current decreases with decreasing
applied voltage.
FIGURE 5
Typical Effect of Applied Voltage on DC
Leakage Current.
9. Dissipation Factor (DF)
Refer to part number tables for maximum DF
limits.
Dissipation factor is measured at 120 Hz, up to
1.0 volt rms maximum, and up to 2.0 volts DC
maximum at +25°C. The application of DC bias
causes a small reduction in DF, about 0.2% when
full rated voltage is applied. DF increases with
increasing frequency.
Frequency — Hertz
FIGURE 6 Typical Effect of Frequency upon Dissipation
Factor
Dissipation factor is a very useful low frequency
(120 Hz) measurement of the resistive component
of a capacitor. It is the ratio of the equivalent series
resistance (ESR) to the capacitive reactance, (X
C
)
and is usually expressed as a percentage. It is
directly proportional to both capacitance and fre-
quency. Dissipation factor loses its importance at
higher frequencies, (above about 1 kHz), where
impedance (Z) and equivalent series resistance
(ESR) are the normal parameters of concern.
DF = R = 2 fCR
DF = Dissipation Factor
X
C
R = Equivalent Series
Resistance (Ohms)
X
C
= Capacitive Reactance
(Ohms)
f = Frequency (Hertz)
C = Series Capacitance
(Farads)
DF is also referred to as tan
The “Quality Factor,” “Q,” is the reciprocal of DF.
DF decreases with temperature above +25°C and
may also increase at lower temperatures.
Unfortunately, one general limit for DF cannot be
specified for all capacitance/voltage combinations,
nor can response to temperature be simply stated.
DC bias is not commonly used at room tempera-
ture, but is more commonly used at elevated tem-
peratures.
or “l(fā)oss tangent.”
10. Equivalent Series Resistance (ESR) and
Impedance (Z)
Equivalent Series Resistance (ESR) is the pre-
ferred high-frequency statement of the resistance
unavoidably appearing in these capacitors. ESR
is not a pure resistance, and it decreases with
increasing frequency.
Total impedance of the capacitor is the vector
sum of capacitive reactance (X
) and ESR, below
resonance; above resonance total impedance is
the vector sum of inductive reactance (X
L
) and
ESR.
M
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
M
Percentage of Rated Voltage
0
10
20
30
40
50
60
70
80
90
100
110
1.0
0.1
0.01
0.001
M
100
1k
10k
20.0
10.0
5.0
1.0
Reference
1.0 at 120 Hz
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相關代理商/技術參數
參數描述
T491C474M035AT 制造商:KEMET 制造商全稱:Kemet Corporation 功能描述:Surface Mount Capacitors
T491C474M050AT 功能描述:鉭質電容器-固體SMD 50volts 0.47uF 20% RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫存號:E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk
T491C474M050AT4394 制造商:KEMET Corporation 功能描述:.470UF 50.0V - Boxed Product (Development Kits)
T491C474M050ZT 功能描述:鉭質電容器-固體SMD .470UF 50.0V RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫存號:E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk
T491C474M050ZT7280 制造商:KEMET Corporation 功能描述:Cap Tant Solid 0.47uF 50V C CASE 20% (6 X 3.2 X 2.5mm) SMD 6032-28 125
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