There are half-a-dozen ceramic dielectrics in regular use today: the ultra stable Class 1 types P90 (porcelain), NPO (COG) and U2J (N2200), and the stable Class II types X7R, X5R and Y5V.
With increasing use of electronic modules in under-the-hood applications in the automotive industry, X8* type ceramic dielectrics are also becoming increasingly popular.
X8G, X8L and X8R are all high temperature ceramic dielectrics for use in demanding applications up to +150°C, and all have a lower operating temperature limit of -55°C. This is what the “X” and the “8” signify. The third character represents the capacitance change over this temperature range. The table below shows the codes for Class II ceramic capacitors.
1st Letter Code Low Temp. Limit Number Code High Temp. Limit 2nd Letter Code Change Over Range X -55°C 4 +65°C A ±1.0% Y -30°C 5 +85°C B ±1.5% Z +10°C 6 +105°C C ±2.2% 7 +125°C D ±3.3% 8 +150°C E ±4.7% 9 +200°C F ±7.5% P ±10% R ±15% S ±22% T +22%-33% U +22%-56% V +22%-82%
This means that X8L and X8R types are stable Class II dielectrics, while the rarer X8G type is an ultra stable Class I dielectric.
The table below lists data sheets for all XRG, X8L and X8R capacitors in production today from major brands such as AVX, KEMET, Knowles, Murata, TDK and Vishay.
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