A700D127M004ATE018 查看數據表（PDF） - KEMET

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A700D127M004ATE018

ALUMINUM ORGANIC CAPACITORS

KEMET 

ALUMINUM ORGANIC CAPACITORS

Performance Characteristics

DC Leakage Current is the current that flows

through the capacitor dielectric after a five minute

charging period at rated voltage. Leakage is meas-

ured at 25°C with full rated voltage applied to the

capacitor through a 1000 ohm resistor in series with

the capacitor.

DC Leakage Current does increase with tempera-

ture. The limits for 85°C @ Rated Voltage and

125°C are both 2 times the 25°C limit.

1

Xc = 2πfC (Ohms)

Where:

f = frequency (Hertz)

C = capacitance (Farad)

ESR

θ

δ

Xc

7. Dissipation Factor (DF)

Refer to part number tables for maximum DF limits.

Dissipation factor is measured at 120 Hz, up to 1.0

volt rms maximum. Dissipation factor is the ratio of

the equivalent series resistance (ESR) to the capaci-

tive reactance, (Xc) and is usually expressed as a

percentage. It is directly proportional to both capaci-

tance and frequency. Dissipation factor loses its

importance at higher frequencies, (above about 1

kHz), where impedance (Z) and equivalent series

resistance (ESR) are the normal parameters of con-

cern.

Figure 2a Total Impedance of the Capacitor

Below Resonance

XL = 2πfL (Ohms)

Z

Where:

f = frequency (Hertz)

L = inductance (Henries)

R

DF = Xc = 2πfCR

Where:

DF = Dissipation Factor

R = Equivalent Series Resistance (Ohms)

Xc = Capacitive Reactance(Ohms)

f = Frequency (Hertz)

C = Capacitance (Farads)

DF is also referred to as tan δ or "loss tangent."

The "Quality Factor," "Q", is the reciprocal of DF.

XL δ

θ

ESR

Figure 2b Total Impedance of the Capacitor

Above Resonance

To understand the many elements of a capacitor,

see Figure 3.

8. Equivalent Series Resistance (ESR) and

Impedance (Z)

The Equivalent Series Resistance (ESR) of the AO-

CAP is much lower than standard Tantalum caps

because the polymer cathode has much higher con-

ductivity. ESR is not a pure resistance, and it

decreases with increasing frequency.

C

ESL ESR RL

Cd Rd

Total impedance of the capacitor is the vector sum of

capacitive reactance (Xc) and ESR below reso

nance; above resonance total impedance is the vec-

tor sum of inductive reactance (XL) and ESR.

Figure 3 The Real Capacitor

A capacitor has a complex impedance consisting of

many series and parallel elements, each adding to

the complexity of the measurement system.

ESL - Represents inductance. In most instances it is

significant at the basic measurement frequencies of

120 and 1000 Hz.

ESR - Represents the ohmic resistance in series

with the capacitance. Lead attachment and capacitor

electrodes are contributing sources.

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

59

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