The **RTS-32A-R** is a high-performance, ultra-miniature Surface Mount Device (SMD) Tuning Fork Crystal. These components are primarily used to provide a stable frequency reference for timing circuits. --- ## 1. Key Specifications The following table outlines the technical parameters typically associated with the RTS-32A-R series: | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 32.768 kHz | | **Package Size** | 3.2 x 1.5 x 0.9 mm | | **Frequency Tolerance** | ±20ppm (Standard) | | **Load Capacitance (CL)** | 6.0pF, 7.0pF, 9.0pF, or 12.5pF | | **Operating Temp Range** | -40°C to +85°C | | **Equivalent Series Resistance (ESR)** | 70 kΩ Max | | **Drive Level** | 0.1 µW (Typical), 1.0 µW Max | --- ## 2. Electronic Characteristics ### Frequency Stability The "32.768 kHz" frequency is standard for "Real Time Clock" (RTC) applications. This specific value is $2^{15}$ Hz, which allows digital circuits to reach exactly 1 second by using a simple 15-stage binary counter. ### Tuning Fork Design The internal element is a chemically etched quartz crystal shaped like a tuning fork. When an oscillating voltage is applied, the "tines" of the fork vibrate at a precise resonance. The **-R** suffix often denotes compliance with **RoHS** (Restriction of Hazardous Substances) standards. ### Capacitance Matching To ensure the frequency remains within the specified ±20ppm tolerance, the external capacitors on the PCB must match the rated **Load Capacitance (CL)** of the crystal. Incorrect matching leads to frequency "pulling" (drifting). --- ## 3. Applications The RTS-32A-R is commonly integrated into the following devices: * **IoT Devices:** Low power consumption is critical for battery-operated sensors. * **Wearables:** Its ultra-small footprint (3.2mm) is ideal for smartwatches and fitness trackers. * **Microcontrollers (MCUs):** Acts as the external clock source for the internal RTC module of chips like STM32 or ESP32. * **Industrial Meters:** Used in smart meters for accurate time-stamping of data. --- ## 4. Soldering & Handling * **Reflow Profile:** Designed for high-temperature lead-free soldering processes. * **Hermetic Sealing:** The part is vacuum-sealed in a ceramic package with a metal lid to ensure long-term aging stability.