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111

489D, 499D

Vishay Sprague

Document Number 42070

Revision 02-Aug-02

For technical questions, contact eurotant@vishay.com

GUIDE TO APPLICATION

1. AC ripple current: The maximum allowable ripple

current shall be determined from the formula:

where

2. AC ripple current: The maximum allowable ripple

voltage shall be determined from the formula :

x Z , where

3. AC ripple current or voltage derating factor: If these

capacitors are to be operated at temperatures above

+25°C, the permissible rms ripple current or voltage shall

be calculated using the derating factors in the table

below:

4. Power dissipation: Power dissipation will be affected

by the heat sinking capability of the mounting surface.

Non-sinusoidal ripple current may produce heating effects

which differ from those shown in the following table. It is

important that the equivalent I

when calculating permissible operating levels.

TEMPERATURE

DERATING FACTOR

+ 25°C

1.0

+ 55°C

0.9

+ 85°C

0.8

+ 125°C.

0.4

CASE

POWER DISSIPATION

CODE

@ + 25

A

0.080

B

0.090

C

0.100

D

0.110

E

0.120

F

0.130

H

0.140

M

0.150

N

0.160

R

0.180

5. Cleaning: These capacitors are compatible with all

commonly used solvents, such as TES, TMS, Prelete and

Chloretane. Solvents containing methylene chloride or other

epoxy solvents should be avoided since these will attack the

epoxy encapsulation material.

P = Power Dissipation in Watts at + 25°C as

given below

R

the specified frequency.

Z = The capacitor Impedance at the specified frequency.

P

R

ESR

P

R

ESR

Resin-Coated, Radial-Leaded

Solid Tantalum Capacitors