Capacitors,Polyester Film Capacitors,Metallized Polyester Film Capacitos,Interference Suppressors Capacitors,MMT Capacitors, MEF Capacitors

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Dielectric materials use information :

Polyester film (PE) Capacitors : with higher dissipation factors (tan δ) are generally suitable for low frequency operation, at a comparatively wide range of temperature. The relatively high dielectric constant (ε ) makes it is possible to produce large C-Values in small dimensions.
Polypropylene film (PP) Capacitors : with very low dissipation factors (tan δ) and high dielectric strength and high insulation resistance. They are suitable for high voltage, high frequncies and large current circuits, have are larger dimensions and negative temperature coefficient.
Polycarbonate film (PC) Capacitors : the dielectric constant (ε )are just between polyester and polypropylene materials, additional advantages are excellent temperature stability and good long term stability.
polystyrene film (PS) Capacitors : with excellent high frequencies and high insulation resistance, very low dissipation factors (tan δ) and low capacitance tolerances, the heat resistances and solvent resistance factors are lower.

Plastic Film Dielectrics Characteristics

Characteristics		Polyester (PE)	Polypropylene (PP)	Polycarbonate (PC)	Polystyrene (PS)
Dielectric constant (ε)1KHz 25°C		2.9	2.2	3.0	2.6
Temperature range (°C)※ possible		-55～+125	-55～+105	-55～+125	-40～+85
Volume resistivity (Ω.ｃｍ)		1.E+17	1.E+18	1.E+17	1.E+18
Temperature coefficient (ppm/°C)		500±200	-300±150	0±100	-150±50
Minimum thickness (μｍ)		4.0 ~	1.5 ~	6.0 ~	6.0 ~
Water absorption (%) in weight		0.2	0.05	0.12	0.05
Can be metallized		YES	YES	YES	NO
Dissipation factors (tan δ) at 25° C	1KHz	0.45%	0.02%	0.15%	0.02%
	10KHz	1.1%	0.3%	0.5%	0.02%
	100KHz	1.8%	0.03%	1.0%	0.02%

(Typical values)

Rated Voltage

a) The DC voltage plus peak AC voltage (Vp) shall not be greater than the DC rated voltage. The peak voltage against a zero potential reference shall always be less then nominal DC voltage rating of the capacitor.
b) The peak to peak voltage (Vp-p) shall not be greater than 2.√2 times the AC rated voltage to avoid the ionization inception level.

	Certain application you have to check voltage conditions
	1. Vp ≦ VDC rated
	2. Vrms ≦ VAC rated (for sinusoidal wave)
	3. Vp-p ≦ VAC rated × 2‧√2 (for sinusoidal wave)

c)When DC rated capacitor is operated in AC circuit (except for across-the-line and AC power capacitor) , AC rating shall be determined to be within a value specified below, because of inherent temperature rise,discharge,etc. (See the Table 1)

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