Eia Class 2 Dielectric - Digital Photo Frame 2.4-3.5 Inch - China Small Digital Photo Frame

The EIA Class 2 dielectric materials are ceramic dielectric materials used in ceramic capacitors

. In comparison with the EIA Class 1 dielectrics they tend to have severe temperature drift, high dependence of capacitance on applied voltage, high voltage coefficient of dissipation factor, high frequency coefficient of dissipation, and problems with aging due to gradual change of crystal structure. Aging causes gradual exponential loss of capacitance and decrease of dissipation factor.

The EIA Class 2 dielectrics in general are usually based on formulas with high content of barium titanate (BT), possibly mixed with other dielectric electroceramics. Due to its piezoelectric properties, they are subject to microphonics. Other oxides added can be the same as used for Class 1 ceramics.

The EIA three-character code is derived from the minimum and maximum temperature limit, and the amount of capacitance change permitted within that range.

Minimum

temperature

X

-55 C

Y

-30 C

Z

-10 C

Maximum

temperature

4

+65 C

5

+85 C

6

+105 C

7

+125 C

8

+150 C

9

+200 C

Capacitance

change permitted

A

1.0%

B

1.5%

C

2.2%

D

3.3%

E

4.7%

F

7.5%

P

10%

R

15%

S

22%

T

+22% / -33%

U

+22% / -56%

V

+22% / -82%

Although this code can describe a huge number of possible dielectrics, only a few are commonly manufactured.

X7R is designed for capacitors with capacity ranging typically between 3300 pF to 0.33 F (SMT: 100 pF to 10 F), 10% tolerance. Good for non-critical coupling, filtering, transient voltage suppression, and timing applications. Has high dielectric constant. It is an EIA Class 2 dielectric. Its tolerance over a temperature range of 55 to +125 C is 15%.

Y5P and Y5V are other such class 2 ceramics, with temperature range of 30 to +85 C and wide capacitance change with temperature of 10% or +22/82%. Usually used for capacitances between 150 pF and 2 nF (SMT: 10 nF to 10 F). Y5P is equivalent to the IEC code 2B4.

Z5U is commonly found from 2.2 nF to 2.2 F, 20%. Good for bypass, coupling applications. Low price and small size, poor temperature stability. This is equivalent to the IEC code 2E6.

See also

EIA Class 1 dielectric

EIA Standards

Ceramic Capacitors

Various oxides for the use of electronic parts

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Categories: Ceramic materials | Capacitors | Electronics stubs

by: gaga

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