RF Monolithics (RFM) Type RO2021
(also printed on device is a 5 digit code eg. 24232- 24258)
418.05 MHz Resonator – Single Port• Designed for 418.05 MHz Transmitter Applications
• Low Series Resistance
• Quartz Stability
• Rugged, Hermetic, Low-Profile TO39 Case
• Complies with Directive 2002/95/EC (RoHS)
Please note:- these devices need to be treated correctly to avoid ESD damage, we transfer them from the original manufacturers packaging directly into anti static bags for shipment “untouched by human hand” as it were, for further information please see a useful customer feedback below.
For full data sheet copy and paste- http://www.qic.com.cn/qicfileserver/readFile.action?filePath=/pdf/RFM/RO2021.pdf
The RO2021 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It provides reliable, fundamental-mode quartz frequency stabilization, of fixed frequency transmitters operating at 418.050 MHz.
The RO2021 is designed specifically for remote control and wireless security AM transmitters operating in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15.
These products are designed to be the frequency control element in transmitters and receiver local oscillators.
Their use allows reduced receiver bandwidths, which results in improved sensitivity and immunity to interference.
Tighter center frequency tolerances are becoming popular primarily in Europe.
RFM can provide as tight as +/-50 kHz currently.
These devices are quartz stabilized to ensure maximum temperature performance in a variety of applications.
The SAW Resonator product family includes one and two-port types.
The RO series is a line of true one-port devices with a lumped element model that is similar to that of a bulk crystal device.
One-port resonators are typically used in modified Colpitts oscillator configurations where the resonator is connected between the base of a transistor and ground.
These systems are typically required in applications such as automotive keyless entry, tire pressure monitoring, door and gate openers, personal and home security, automated meter readers, wireless point of sale terminals, bar code readers, identification tags, and computer peripherals.
Some much valued information from a satisfied customer:-
“ESD damage may not be immediately apparent, but results in much shortened device lifetime.
Failure can then occur prematurely within days, weeks, months or early years.
The effect is similar to a partially burnt through wire still conducting but “hanging on by a thread”.
Practical precautions:- Always wear an earthed wrist strap when handling devices (This is a MUST).
Avoid touching the connecting leads whenever possible.
Get yourself some plastic tweezers and use these instead of your fingers!
Once the devices are soldered into a PCB they are much less vulnerable.
In my professional past I have looked at photo micrographs (from research work carried out in Company) of opened damaged devices that were still working.
The evidence was crystal clear!”