© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com

T2075_T502 • 6/24/2016

66

Tantalum Surface Mount Capacitors – High Temperature

Recommended Voltage Derating Guidelines

0%

10%

20%

30%

40%

50%

60%

-55

25

85

125

175

200

215

230

Temperature (°C)

33%

Rated

Voltage

Working Voltage

25°C

85°C

125°C

200°C

215°C

230°C

16

16

16

13.1

7.5

6.4

5.3

25

25

25

20.5

11.8

10

8.3

35

35

35

28.7

16.5

14

11.6

Note: Additional reliability can be obtained through the derating of voltage

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,

ifany,mustnotexceedtheallowablelimitsspecifiedforreverse

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≤200°C

200≥220°C

220≥230°C

1.00

0.70

0.30

T = Environmental Temperature

KEMET

Case Code

EIA

Case Code

Maximum Power

Dissipation (P max)

mWatts at 25°C

w/+20°C Rise

B

3528–21

85

D

7343–31

150

The maximum power dissipation rating must be reduced with increasing

environmental operating temperatures. Refer to the Temperature

Compensation Multiplier table for details.

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 specified frequency (ohms)

Z = Impedance at specified frequency (ohms)