CL21A225KAFNNNG is a 2.2 µF ±10% X5R ceramic in 0805, rated 25 V^p.1 — the middle of the family's capacitance ladder, sized for local bulk decoupling on 5 V and 12 V rails. The X5R dielectric holds capacitance within ±15% from −55 to +85 °C.^p.2

Its insulation-resistance spec is the strong one in this group: 10,000 MΩ or 500 MΩ·µF whichever is smaller, where most of the higher-value siblings are held to 100 MΩ·µF. Dissipation factor is 0.1 max at 1 kHz / 1.0 Vrms, the dielectric is proofed at 250% of rated voltage, and the life test runs 1,000 h at 150% of rated at maximum operating temperature.^p.2

The limits to respect: the X5R window closes at +85 °C, not 125,^p.2 and as a Class II ceramic its capacitance drops under DC bias — the product manual explicitly requires checking the bias characteristic at your working voltage.^p.14 Reflow is rated 260±5 °C peak for 30 s, and it ships on embossed tape on a 7-inch reel.^{p.2, p.1}