Ceramic Capacitors v's Tantalem Capacitors

[Kalee20]

I learned my lesson years ago (1986) using a 2.2μF ceramic surface-mount capacitor in a timing circuit (millisecond not microsecond). Worked fine at room temperature, but get up to 50 deg C and timing drifted massively. It was a Z5U, high-K dielectric.

I changed to 2.2μF Tantalum (which fitted the board layout) and the problem went away.