Tantalum Through-Hole Capacitors – Hermetically Sealed
T550 Axial Polymer Hermetic Seal (PHS) 105ºC and DLA Series
Recommended Voltage Derating Guidelines
120%
100%
80%
60%
40%
20%
0%
−55°Cꢀtoꢀ85°C
85°C to 105°C
78% of VR
% Change in Working DC
Voltage with Temperature
% Change in Working DC Voltage
with Temperature
VR
80%
78%
63%
Recommended Maximum
Application Voltage
(As % of Rated Voltage)
Recommended Maximum Application
Voltage (As % of Rated Voltage)
80% of VR
63% of VR
−55
25
45
85
105
Temperature (°C)
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 that 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.ꢀTheꢀnegativeꢀpeakꢀACꢀvoltageꢀinꢀcombinationꢀwithꢀbiasꢀvoltage,ꢀifꢀany,ꢀmustꢀnotꢀexceedꢀtheꢀallowableꢀlimitsꢀspecifiedꢀ
for reverse voltage.
The maximum power dissipation by case size can be determined using the below left table. The maximum power dissipation
rating stated in the table must be reduced with increasing environmental operating temperatures. Refer to the below right
table for temperature compensation requirements.
Using the Pmax of the device, the maximum allowable rms
ripple current or voltage may be determined.
Maximum Power
Dissipation (Pmax
mWatts at 25°C
with +60°C Rise
)
Case Code
I(max) = √Pmax/R
E(max) = Z √Pmax/R
MIL–PRF–39006/22/
KEMET
B
25/30/31 Case Size
I = rms ripple current (amperes)
E = rms ripple voltage (volts)
T2
715
P
max = maximum power dissipation (watts)
R = ESR at specified frequency (ohms)
Z = Impedance at specified frequency (ohms)
Temperature Compensation Multipliers for
Maximum Power Dissipation (Pmax
)
Tꢀ≤ꢀ45°C
45°Cꢀ<ꢀTꢀ≤ꢀ85°C
85°Cꢀ<ꢀTꢀ≤ꢀ105°C
The maximum power dissipation rating must be reduced with increasing
environmental operating temperatures. Refer to the Temperature
Compensation Multiplier table for details.
1.00
0.70
0.10
T= Environmental Temperature
7
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com
T2059_T550 • 1/12/2018
KEMET [ KEMET CORPORATION ]
