T491B155K025AS Kemet, T491B155K025AS Datasheet - Page 47

• 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

A capacitor is a complex impedance consisting
of many series and parallel elements, each
adding to the complexity of the measurement
system.
ESL — Represents lead wire and construction
inductance. In most instances (especially in
solid tantalum and monolithic ceramic capaci-
tors) it is insignificant at the basic measurement
frequencies of 120 and 1000 Hz.
ESR— Represents the actual ohmic series resis-
tance in series with the capacitance. Lead wires
and capacitor electrodes are contributing
sources.
R
can reach 50,000 megohms in a tantalum
capacitor. It can exceed 10
ceramics and in film capacitors.
R
absorption and molecular polarization. It
becomes very significant in high frequency mea-
surements and applications. Its value varies with
frequency.
C
solid tantalum capacitor which typically equates
to 1-2% of the applied voltage.
As frequency increases, X
decrease according to its equation above. There
is unavoidable inductance as well as resistance
in all capacitors, and at some point in frequency,
the reactance ceases to be capacitive and
becomes inductive. This frequency is called the
self-resonant point. In solid tantalum capacitors,
the resonance is damped by the ESR, and a
smooth, rather than abrupt, transition from
capacitive to inductive reactance follows.
Figure 4 compares the frequency response of a
KO-CAP to a standard Tantalum chip. Maximum
limits for 100 kHz ESR are listed in the part
number tables for each series.
The T530 Capacitance, Impedance and ESR vs.
Frequency Comparisions are located on page
57. Maximum limits for 100 kHz are listed in the
part number table on page 56.
L
d
d
— Capacitor Leakage Resistance. Typically it
— The dielectric loss contributed by dielectric
— The inherent dielectric absorption of the
ESL
©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, [phone]
CONDUCTIVE POLYMER CHIP CAPACITORS
ESR
C
12
d
ohms in monolithic
C
R
C
L
continues to
R
d
10. AC Power Dissipation
11. Ripple Current/ Ripple Voltage
Impedance & ESR (Ohms)
T520/W
KEMET
T520/U
T520/C
T530/D
T520/T
T520/A
T52x/B
T520/V
T52x/D
T520/Y
T520/X
T530/Y
T530/X
T530/E
0.01
100
Permissible AC ripple voltage and current are
related to equivalent series resistance (ESR) and
power dissipation capability.
Permissible AC ripple voltage which may be
applied is limited by three criteria:
a. The positive peak AC voltage plus the DC bias
b. The negative peak AC voltage, in combination
c. The power dissipated in the ESR of the capaci-
0.1
Power dissipation is a function of capacitor size
and materials. Maximum power ratings have been
established for all case sizes to prevent overheat-
ing. In actual use, the capacitor’s ability to dissi-
pate the heat generated at any given power level
may be affected by a variety of circuit factors.
These include board density, pad size, heat sinks
and air circulation.
10
Case Code
1
100
T495D 150 uF (MnO
voltage, if any, must not exceed the DC voltage
rating of the capacitor.
with bias voltage, if any, must not exceed the
permissible reverse voltage ratings presented
in Section 5.
tor must not exceed the appropriate value
specified in Section 10.
3528-12
3216-18
3528-21
6032-15
6032-28
7343-15
7343-31
7343-40
7343-31
7343-40
7343-20
7343-43
7343-43
7260-38
Power Dissipation Ratings
EIA
1,000
mWatts @ +25ºC w/+20ºC Rise
10,000
Table 3
Maximum Power Dissipation
2
Frequency (Hz)
) vs. T520D 150 uF (Polymer)
100,000
Polymer
MnO
110
120
125
150
161
165
255
263
270
285
70
75
85
90
2
1,000,000
10,000,000
45