Datasheet

7© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard T2004_T490 • 8/20/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
7
Tantalum Surface Mount Capacitors – Standard Tantalum
T490 Commercial Grade MnO
2
Recommended Voltage Derating Guidelines
−55°Cto40°C 40°C to 85°C 85°C to 125°C
% Change in
Working DC
Voltage with
Temperature
100% of V
r
50% of V
r
20% of V
r
Recommended
Maximum
Application
Voltage
50% of V
r
25% of V
r
10% of V
r
Ripple Current/Ripple Voltage
Permissible AC ripple voltage and current are related to
equivalent series resistance (ESR) and the power dissipation
capabilities of the device. Permissible AC ripple voltage
which may be applied is limited by two criteria:
1. The positive peak AC voltage plus the DC bias voltage,
if any, must not exceed the DC voltage rating of the
capacitor.
2. The negative peak AC voltage in combination with
bias voltage, if any, must not exceed the allowable limits
speciedforthereversevoltage.SeetheReverseVoltage
section for allowable limits.
Themaximumpowerdissipationbycasesizecanbe
determined using the table at right. The maximum power
dissipation rating stated in the table must be reduced with
increasing environmental operating temperatures. Refer to
the table below for temperature compensation requirements.
Temperature Compensation Multipliers
for Maximum Ripple Current
T≤25°C
T≤40°C
T≤125°C
1.00
0.90
0.40
T = Environmental Temperature
The maximum power dissipation rating must be reduced with increasing
environmental operating temperatures. Refer to the Temperature
Compensation Multiplier table for details.
KEMET
Case Code
EIA
Case Code
Maximum Power
Dissipation (P max)
mWatts at 25°C
w/+20°C Rise
A
3216–18
75
B
3528–21
85
T
3528–12
70
Using the P max of the device, the maximum allowable rms
ripple current or voltage may be determined.
I(max) = √P max/R
E(max) = Z √P max/R
I = rms ripple current (amperes)
E = rms ripple voltage (volts)
P max = maximum power dissipation (watts)
R = ESR at specied frequency (ohms)
Z = Impedance at specied frequency (ohms)
0%
20%
40%
60%
80%
100%
120%
−55 25 40 85 105 125
% Working Voltage
Temperature (°C)
50%
20%
% Change in Working DC
Voltage with Temperature
Recommended Maximum
Application Voltage