C668 datasheet(38/66 Pages) KEMET

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Film Capacitors

With over 50 years of experience manufacturing plastic film capacitors, KEMET also designs and builds

custom equipment for film capacitor production, continuously innovating and improving the production

capability, quality, and efficiency. Because films are exceptionally thin – less than 1µm in some cases

– extreme precision and process control is required to manufacture quality capacitors for demanding

applications.

In the most common type of film capacitor, the electrodes are vacuum deposited, or metallized onto a

roll of precision plastic film. The metallization is not deposited near one edge. Two films, one with the

unmetallized edge on the left and one on the right, are laid on top of each other and wound into a roll.

In many cases, the roll is flattened. Next, several metal layers are sprayed on the ends. These become

the electrodes onto which wires are welded before encapsulation.

Another variation has the two films in a stack of layers much like a multilayer ceramic capacitor. These

can either have leads attached and be encapsulated for through-hole capacitors, or left unencapsulated

for surface mount capacitors. KEMET offers several variations on this basic construction using all the

commonly available plastic films to meet a broad range of application requirements. KEMET commonly

customizes film capacitors for specific applications when a standard part is not available.

Dielectric

absorption

Insulation time

constant(s) at

+23°C

Dissipation

factor at

1 kHz, +23°C

Temperature coefficient

(ppm/°C)

Operating

Temperature (°C)

Nomal/(Extended)

Dielectric

constant at

1 kHz, +23°C

Min. film

thickness

(µm)

Abbreviation

Dielectric

Material

Polyester

Polyethylene

Naphthalate

Polyphenylene

Sulfide

Polypropylene

Paper

Impregnated

PET

PEN

PPS

0.9

1.4

1.2

2.4

8.0

3.3

3.0

2.2

5.5

0.5%

0.4%

0.06%

0.03%

0.8%

25,000

50,000

100,000

15,000

0.5

1.2

0.05

0.01

N/A

-55 to +100

( +125)

-55 to +125

( +150)

-55 to +125

( +175)

-55 to +105

( +125)

-40 to +115

+400 (±200)

+200 (±150)

0 (-50) -55 to +100

550 (±50) +100 to +150

0 (+50) +150 to +200

-200

(-100, +50) almost liner

+1200 (±200)

Properties of common dielectrics used in film capacitors

electrode

free margin

dielectric

C668 数据表(PDF) 38 Page - Kemet Corporation

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