T491B155K025AS Kemet, T491B155K025AS Datasheet - Page 9

• Manufacturer Part Number: T491B155K025AS
• Description: CAPACITOR TANT 1.5UF 25V 10% SMD
• Manufacturer: Kemet
• Series: T491r
• Type: Moldedr

Specifications of T491B155K025AS

• Capacitance: 1.5µF
• Voltage - Rated: 25V
• Tolerance: ±10%
• Esr (equivalent Series Resistance): 5.000 Ohm
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 1210 (3528 Metric)
• Size / Dimension: 0.138" L x 0.110" W (3.50mm x 2.80mm)
• Height: 0.075" (1.90mm)
• Manufacturer Size Code: B
• Features: General Purpose
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Spacing: -
• Other names: 399-1625-2

0.001
0.01
1.0
DC leakage current decreases with decreasing
applied voltage.
0.1
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.
0
©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, [phone]
10
10.0
1.0
0.1
20
-60 -40 -20
30
Reference 1.0
at + 25 C
Percentage of Rated Voltage
SOLID TANTALUM CHIP CAPACITORS
40
Operating Temperature— C
50
0
+20 +40 +60 +80 +100 +125
60
70
80
90
100
110
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
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 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.
20.0
10.0
DF = R = 2 fCR
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
resonance; above resonance total impedance is
the vector sum of inductive reactance (X
ESR.
5.0
1.0
100
Reference
1.0 at 120 Hz
X
C
DF = Dissipation Factor
X
C = Series Capacitance
R = Equivalent Series
C
f = Frequency (Hertz)
= Capacitive Reactance
1k
Resistance (Ohms)
(Ohms)
(Farads)
C
or “loss tangent.”
) and ESR, below
10k
L
) and
C
7
)