A700D127M006ATE018 データシートの表示（PDF） - KEMET

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A700D127M006ATE018

ALUMINUM ORGANIC CAPACITORS

KEMET 

ALUMINUM ORGANIC CAPACITORS

Performance Characteristics

RL - Capacitor Leakage Resistance. Typically it can

be 35 K to 2.5 MOhms depending on voltage -

capacitance. It can exceed 1012 ohms in monolithic

ceramics and in film capacitors.

Rd - The dielectric loss contributed by dielectric

absorption and molecular polarization. It becomes

very significant in high frequency measurements and

applications. Its value varies with frequency.

Cd - The inherent dielectric absorption of the solid

aluminum capacitor.

As frequency increases, Xc continues to decrease

according to its equation. There is unavoidable

inductance as well as resistance in all capacitors,

and at some point in frequency, the reactance ceas-

es to be capacitive and becomes inductive. This fre-

quency is call the self-resonant point.

Figure 4 compares the frequency response of an

AO-CAP to a Tantalum chip. Maximum limits for 100

kHz ESR are listed in the part number tables for

each series.

10. Ripple Current/Voltage

Permissible AC ripple voltage and current are related

to equivalent series resistance (ESR) and power dis-

sipation capability.

Permissible ripple current which may be applied

is limited by two criteria:

a. The resulting voltage across the capacitor with the

summation of DC bias and peak voltage of the

AC portion must not exceed the rated voltage of

the capacitor.

b. The negative peak AC voltage, in combination

with bias voltage, if any, must not exceed the per-

missible reverse voltage ratings presented in

Section 5.

Actual power dissipated may be calculated from the

following:

P = I2R

Substituting I = E ; P = E2R

Z

Z2

Where:

I = rms ripple current (Amperes)

E = rms ripple voltage (Volts)

P = power (Watts)

Z = impedance at specified frequency (ohms)

R = ESR(Ohms)

Using P max from Table 3, maximum allowable rms

ripple current or voltage may be determined as fol-

lows:

Figure 4.

9. AC Power Dissipation

Power dissipation is a function of capacitor size and

materials. Maximum power ratings have been estab-

lished for all case sizes to prevent overheating. In

actual use, the capacitor's ability to dissipate the

heat generated at any given power level may be

affected by a variety of circuit factors. These include

board density, pad size, heat sinks and air circulation.

Power capability is determined based on a 20°C tem-

perature rise. A higher temperature rise and therefore

higher power capability is allowable as long as the

ambient temperature plus temperature rise due to rip-

ple current does not exceed the rated temperature of

the part.

Case Code Maximum Power Dissipation mWatts

KEMET EIA @ +25°C with 20° Temperature Rise

V 7343-20

270

D 7343-31

250

X 7343-43

225

Imax =

Pmax

ESR

Emax = Z

Pmax

R

Where:

Imax = Maximum rupple current (ARMS)

Pmax = Maximum Power @ allowable ∆T normally

+20°C

Emax = Maximum ripple voltage (VRMS)

Refer to part number listings for permittable Arms

limits.

Table 3 - AO Capacitor Power Dissipation Ratings

60

©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300

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