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SR215C104CAA Datasheet(PDF) 6 Page - AVX Corporation |
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SR215C104CAA Datasheet(HTML) 6 Page - AVX Corporation |
6 / 72 page 4 The Capacitor CERAMIC LAYER ELECTRODE TERMINATE EDGE TERMINATE EDGE END TERMINATIONS ELECTRODES MARGIN basic characteristics into more easily specified classes. The basic industry specification for ceramic capacitors is EIA specification RS-198 and as noted in the general section it specifies temperature compensating capacitors as Class 1 capacitors. These are specified by the military under specification MIL-C-20. General purpose capacitors with non-linear temperature coefficients are called Class 2 capacitors by EIA and are specified by the military under MIL-C-11015 and MIL-C-39014. The new high reliability military specification, MIL-C-123 covers both Class 1 and Class 2 dielectrics. Class 1 – Class 1 capacitors or temperature compensating capacitors are usually made from mixtures of titanates where barium titanate is normally not a major part of the mix. They have predictable temperature coefficients and in general, do not have an aging characteristic. Thus they are the most stable capacitor available. Normally the T.C.s of Class 1 temperature compensating capacitors are C0G (NP0) (negative-positive 0 ppm/°C). Class 1 extended temperature compensating capacitors are also manufac- tured in T.C.s from P100 through N2200. Class 2 – General purpose ceramic capacitors are called Class 2 capacitors and have become extremely popular because of the high capacitance values available in very small size. Class 2 capacitors are “ferro electric” and vary in capacitance value under the influence of the environmental and electrical operating conditions. Class 2 capacitors are affected by temperature, voltage (both AC and DC), frequency and time. Temperature effects for Class 2 ceramic capacitors are exhibited as non-linear capacitance changes with temperature. TC TOLERANCES (1) Capacitance in pF NP0 N030 N080 N150 N220 N330 N470 N750 N1500 N2200 -55°C to +25°C in PPM/°C 10 and Over +30 +30 +30 +30 +30 +60 +60 +120 +250 +500 -75 -80 -90 -105 -120 -180 -210 -340 -670 -1100 +25°C to +85°C in PPM/°C 10 and Over ±30 ±30 ±30 ±30 ±30 ±60 ±60 ±120 ±250 ±500 Closest MIL-C-20D CG HG LG PG RG SH TH UJ NONE NONE Equivalent EIA Desig. C0G S1G U1G P2G R2G S2H T2H U2J P3K R3L (1) Table 1 indicates the tolerance available on specific temperature characteristics. It may be noted that limits are established on the basis of measurements at +25°C and +85°C and that T.C. becomes more negative at low temperature. Wider tolerances are required on low capacitance values because of the effects of stray capacitance. Table 1: EIA Temperature Compensating Ceramic Capacitor Codes Figure 1 |
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