T491B155K025AS Kemet, T491B155K025AS Datasheet - Page 45

• 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

Introduction
KEMET has developed a new type of tantalum capacitor that
replaces the solid manganese dioxide electrode with a solid
conductive polymer. This product is named the KO-CAP for
KEMET Organic Capacitor. The basic families are the T520,
T525 and T530 series. A separate detail of performance char-
acteristics is presented here as there are some differences
between the polymer tantalums and the standard MnO2
types. Like all KEMET tantalum chips, these series are 100%
screened for all electrical parameters: Capacitance @ 120 Hz,
Dissipation Factor (DF) @ 120 Hz, ESR @ 100 kHZ and DC
Leakage. It is also 100% surge current tested at full rated volt-
age through a low impedance circuit. The advantages of the
polymer include very low ESR and elimination of the potential-
ly catastrophic failure mode that may occur with standard tan-
talum capacitors in a high current application. Although the
natural KO-CAP series failure mechanism is a short circuit, it
does not exhibit an explosive failure mode.
1. Operating Temperature Range
2. Non-Operating Temperature Range
3. Capacitance and Tolerance
4. Voltage Ratings
• 2V-25V DC Rated Voltage
This is the maximum peak DC operating voltage from
-55ºC to +105ºC for continuous duty. Above 105ºC, this
voltage is derated linearly to 2/3 the rated voltage for
operation at 125ºC for T525 and T530 Series.
• -55ºC to +105ºC for T520; -55ºC to +125ºC for
For T525 and T530 Series above 105ºC, the
voltage rating is reduced linearly from 1.0 x rated volt-
age to 0.8 x rated voltage at 125ºC.
• -55ºC to +105ºC for T520
• -55ºC to +125ºC for T525 and T530
• 15μF to 1500μF
• ±20% Tolerance
Capacitance is measured at 120 Hz, up to 1.0 volt rms
maximum and up to 2.5V DC maximum. DC bias causes
only a small reduction in capacitance, up to about 2%
when full rated voltage is applied. DC bias is not common-
ly used for room temperature measurements but is more
commonly used when measuring at temperature extremes.
Capacitance does decrease with increasing frequency, but
not nearly as much or as quickly as standard tantalums.
Figure 1 compares the frequency induced cap roll-off
between the KO-CAP and traditional MnO2 types.
Capacitance also increases with increasing temperature.
See section 12 for temperature coefficients.
Capacitance (uF)
150
100
T525 and T530
50
0
10
©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, [phone]
100
ELECTRICAL
1,000
CONDUCTIVE POLYMER CHIP CAPACITORS
MnO
10,000
Frequency (Hz)
2
100,000
Polymer
1,000,000
10,000,000
100,000,000
• Voltage Ratings • Table 1
5. Reverse Voltage Rating & Polarity
6. DC Leakage Current
Voltage
• Surge Voltage Ratings
Surge voltage capability is demonstrated by applica-
tion of 1000 cycles of the relevant voltage, at 25ºC,
85ºC or 105ºC. The parts are charged through a 33
ohm resistor for 30 seconds and then discharged
through a 33 ohm resistor for 30 seconds for each
cycle.Surge voltage is the maximum voltage to which
the part can be subjected under transient cents.
Polymer capacitors are polar devices and may be per-
manently damaged or destroyed if connected in the
wrong polarity. The positive terminal is identified by a
laser-marked stripe and may also include a beveled
edge. These capacitors will withstand a small degree
of transient voltage reversal for short periods as
shown in the following table. Please note that these
parts may not be operated continuously in reverse,
even within these limits.
Temperature
Because of the high conductivity of the polymer, the
KO-CAP family has higher leakage currents than tradi-
tional MnO2 type Tantalum caps. The DC Leakage
limits at 25ºC are calculated as 0.1 x C x V, where C is
cap in μF and V is rated voltage in Volts. Limits for all
part numbers are listed in the ratings tables.
DC Leakage current is the current that flows through
the capacitor dielectric after a five minute charging
period at rated voltage. Leakage is measured at 25ºC
with full rated voltage applied to the capacitor through
a 1000 ohm resistor in series with the capacitor.
Rated
2.5V
6.3V
10V
16V
25V
2V
3V
4V
8V
105ºC
125ºC
-55ºC to +105ºC
25ºC
55ºC
85ºC
85ºC
100%
80%
60%
40%
20%
-60
-40
Voltage
Surge
10.4V
20.8V
32.5V
2.6V
3.3V
3.9V
5.2V
8.2V
13V
-20
Permissible Transient Reverse Voltage
0
Operating Temperature— C
Table 2
+20 +40 +60 +80 +100 +120 +140
15% of Rated Voltage
10% of Rated Voltage
5% of Rated Voltage
5% of Rated Voltage
3% of Rated Voltage
1% of Rated Voltage
Derated
Voltage
12.8V
1.6V
2.0V
2.4V
3.2V
6.4V
20V
5V
8V
+125ºC
Derated
Voltage
Surge
10.4V
16.6V
2.1V
2.6V
3.1V
4.2V
6.5V
8.3V
26V
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