Resonators function like crystals but stick closer to their specified frequency over a full temperature range. These resonators are +/-0.5% or better from -20C-+80C. These resonators have built-in load capacitors so no external caps are needed.
**Datasheets: **[ 20MHz](http://www.sparkfun.com/datasheets/Components/Resonator-20MHz.pdf), [ 10/8/4MHz](http://www.sparkfun.com/datasheets/Components/Resonator-10MHz.pdf)