RoHS Compliance This component is compliant with RoHS directive. This component was always RoHS compliant from the first date of manufacture. Designed for European 433.92 MHz Remote Control and Security Transmitters Very Low Series Resistance Quartz Stability The RO3101E is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case. It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters op.