一、Characteristics
The parameters of the 315MHz surface acoustic wave resonator are: the center frequency is 315MHz; The frequency tolerance is ±75KHz; Package form is 3225, small insertion loss (≤2.0dB), high precision, temperature operation (temperature: -25℃--+60℃; Storage temperature: -45℃--+85℃) Good characteristics, high integration, easy welding, good weldability, light weight, good performance, high stability, cheap, easier to install than the traditional ceramic resonator, smaller volume and other advantages.
R315 surface acoustic wave resonator plays a good role in suppressing high order harmonics, image information, transmission leakage signal and various parasitic clutter interference of electronic information equipment. R315 surface acoustic wave resonator can filter amplitude-frequency and phase-frequency characteristics with any desired accuracy, which is difficult to complete with other filters. The biggest drawback of the R315 sound meter resonator is that the bandwidth is too narrow (tens of KHZ), resulting in extremely slow download speeds.
315MHz surface acoustic wave resonator
| Item | Minimum | Typical | Maximum | Unit |
| Center Frequency | 314.925 | 315.000 | 315.075 | MHz |
| Insertion Loss(min) | - | 1.0 | 2.0 | dB |
| Quality Factor | Unloaded Q | - | 12588 | - | - |
| 50Ω Loaded Q | - | 1369 | - | - |
| Absolute Value during the First Year | - | ≤10 | - | ppm/y |
| DC Insulation Resistance between Any Two Pins | 1.0 | - | - | MΩ |
RF Equivalent RLC Model | Motional Resistance | - | 12.2 | - | Ω |
| Motional Inductance | - | 77.6 | - | µH |
| Motional Capacitance | - | 3.29 | - | fF |
| Pin 1 to Pin 2 Static Capacitance | 2.3 | 2.5 | 2.8 | pF |
Operation Temperature
| -40 | - | +85 | ℃ |
| Package style | SMD 3225 |
二、Package Dimension
| Pin | Configuration |
| 1 | Input / Output |
| 3 | Output / Input |
| 2、4 | Case Ground |
三、Typical Frequency Response
四、Application & attention
◆ The center frequency (315MHz) of the R315 surface acoustic wave resonator was measured at a temperature of + 25±2 ° C in a 50Ω test system with an insertion loss of 1.4dB.
◆ Frequency aging refers to the change in the center frequency (315MHz) over time and is measured at +65 ° C (or above) for a long time. Typically, the degree of aging is highest in the first year after production and gradually decreases in subsequent years.
◆ Target temperature refers to the temperature measured from the lowest frequency of 314.925MHz to 315MHz and then to the highest frequency of 315.075MHz.
◆ The nominal frequency at any temperature can be calculated by :f = f0 [1-FTC (T0-TC)*2].
R315 resonator is widely used in test remote control, wireless transmitter module, wireless smart socket, smart door lock, wireless doorbell, wireless alarm, wireless communication system and remote transmitter. When used, the welding temperature should not be too high, and the time should not be too long. If reflow welding is used, reference temperature is recommended, and wave crest welding is not recommended. Products should be stored in the ambient temperature of -10℃~40℃, relative humidity is not more than 80%, the surrounding environment is not acidic, alkaline and other harmful gases in the warehouse. Do not soak when cleaning, it is recommended to wipe with alcohol.
The company produces and customizes SMD SAW resonators, R433 surface acoustic wave resonators, R315 surface acoustic wave resonators, R320 surface acoustic wave resonators, SMD surface acoustic wave resonators for wireless emission modules, and various frequencies, various package sizes of surface acoustic wave resonators.
