TAJB335016 datasheet(34/51 Pages) AVX

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1.4.4 Temperature dependence of the Impedance

and ESR.

At 100kHz, impedance and ESR behave identically and

decrease with increasing temperature as the typical curves

show.

1.5 D.C. LEAKAGE CURRENT

1.5.1 Leakage current.

The leakage current is dependent on the voltage applied,

the elapsed time since the voltage was applied and the

component temperature. It is measured at +20°C with the

rated voltage applied. A protective resistance of 1000

Ω

is connected in series with the capacitor in the measuring

circuit. Three to five minutes after application of the rated

voltage the leakage current must not exceed the maximum

values indicated in the ratings table. These are based on the

formulae 0.01CV or 0.5µA (whichever is the greater).

Reforming of tantalum capacitors is unnecessary even after

prolonged storage periods without the application of voltage.

1.5.2 Temperature dependence of the leakage

current.

The leakage current increases with higher temperatures,

typical values are shown in the graph. For operation between

85°C and 125°C, the maximum working voltage must be

derated and can be found from the following formula.

Vmax =

1- (T - 85)

x V

Rvolts, where T is the required

125

operating temperature.

1.5.3 Voltage dependence of the leakage current.

The leakage current drops rapidly below the value corre-

sponding to the rated voltage V

R when reduced voltages are

applied. The effect of voltage derating on the leakage current

is shown in the graph. This will also give a significant increase

in the reliability for any application. See Section 3.1 for

details.

For additional information on Leakage Current, please

consult the AVX technical publication "Analysis of Solid

Tantalum Capacitor Leakage Current" by R. W. Franklin.

1.5.4 Ripple current.

The maximum ripple current allowed can be calculated from

the power dissipation limits for a given temperature rise

above ambient temperature (please refer to Section 2).

ESR vs. TEMPERATURE

0.1

0.01

-55 -40 -20

Temperature (

°C)

125

0.1

0.01

100

Rated Voltage (VR) %

Leakage Current

ratio I/IVR

LEAKAGE CURRENT vs. RATED VOLTAGE

Typical

Range

TAJD336M006

TAJD476M010

TAJD336M016

TAJC685M020

-2

-4

-6

-8

-10

-20

100

Applied Voltage (Volts)

LEAKAGE CURRENT vs. BIAS VOLTAGE

-55 -40 -20

20 40

80 100 +125

0.1

Temperature (

°C)

Leakage current

ratio I/IR20

LEAKAGE CURRENT vs. TEMPERATURE

Technical Summary and

Application Guidelines

TAJB335016 Datasheet(PDF) 34 Page - AVX Corporation

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