The **FTS-2F-R/Q** refers to a specific series of high-frequency, surface-mount (SMD) **Tuning Fork Crystal Resonators**, typically manufactured by companies like Seiko Epson or specialized quartz timing component providers. These parts are fundamental in electronic circuits for timekeeping and frequency control. ### 1. Key Technical Specifications Below are the typical parameters for the FTS-2F series (specifically the R/Q variants): | Parameter | Specification (Typical) | | :--- | :--- | | **Nominal Frequency** | 32.768 kHz (Standard for RTC) | | **Package Type** | Metal Can / Plastic Molded SMD | | **Load Capacitance ($C_L$)** | 7.0 pF to 12.5 pF | | **Frequency Tolerance** | ±20 ppm (Standard) | | **Operating Temperature** | -40°C to +85°C | | **Drive Level** | 1.0 µW Max | --- ### 2. Composition and Design The "FTS-2F" designation implies a specific form factor and internal structure: * **Tuning Fork Design:** The internal quartz crystal is etched into a "U" shape (tuning fork). This shape allows the crystal to vibrate at a very low and stable frequency (32.768 kHz) relative to its small size. * **Piezoelectric Effect:** It operates on the principle where mechanical stress generates an electric charge, and conversely, an applied voltage causes mechanical deformation. * **The R/Q Suffix:** These often denote specific packaging orientations or internal sorting codes: * **R:** Often indicates Tape & Reel packaging for automated pick-and-place machines. * **Q:** Can indicate a specific quality grade or a variation in the load capacitance ($C_L$) tuning. --- ### 3. Circuit Application These parts are almost exclusively used as the heartbeat for **Real-Time Clocks (RTC)** and Microcontrollers (MCU) in "Sleep" or "Power-down" modes. #### Example Oscillation Circuit To use this part, it is typically paired with two load capacitors ($C_1, C_2$) and an inverter (internal to the IC): ```c +-------[ IC (Inverter) ]-------+ | | [Pin 1/XTAL_IN] [Pin 2/XTAL_OUT] | | | +-------[ FTS-2F-R/Q ]----------+ | | | [ C1 ] [ C2 ] [ R1 ] (Optional feedback resistor) | | | (GND) (GND) (GND) ``` --- ### 4. Common Use Cases 1. **Consumer Electronics:** Smartwatches, digital cameras, and mobile phones to keep time even when the main processor is off. 2. **Industrial Meters:** Smart utility meters (electric/water) that require low power consumption over long periods. 3. **Automotive:** Dashboard clocks and entry systems. ---