The **ATS-49-R** is a specific type of passive electronic component, specifically a **Quartz Crystal Resonator**. It is widely used in electronic circuits to provide a stable clock frequency for microprocessors, microcontrollers, and other timing-sensitive applications. --- ### 1. Technical Specifications The ATS-49-R belongs to the standard "HC-49/US" family (profiled as a low-profile through-hole component). Below are its primary technical characteristics: | Parameter | Typical Value / Description | | :--- | :--- | | **Component Type** | Quartz Crystal Resonator | | **Package Type** | HC-49/US (Low Profile) | | **Mounting Type** | Through-Hole (THT) | | **Frequency Range** | Typically 3.2 MHz to 70 MHz | | **Frequency Tolerance** | ±30ppm (Standard) | | **Load Capacitance** | Usually 18pF, 20pF, or Series | | **Operating Temp** | -20°C to +70°C (Standard) | | **RoHS Status** | Compliant (Indicated by the **-R** suffix) | --- ### 2. Breakdown of the Part Number The nomenclature usually follows this logic: * **ATS**: Refers to the manufacturer's series (often associated with *CTS Electronic Components*). * **49**: Refers to the industry-standard package size (HC-49). * **-R**: Explicitly signifies **RoHS Compliance** (Lead-free). --- ### 3. Internal Construction and Working Principle The ATS-49-R operates based on the **Piezoelectric Effect**. 1. **The Quartz Slice**: Inside the metal "can" is a precisely cut sliver of synthetic quartz. 2. **Electrodes**: Metal electrodes are deposited on both sides of the quartz slice. 3. **Vibration**: When an oscillating voltage is applied to the leads, the quartz physical vibrates at a very specific resonant frequency. 4. **Stability**: Because quartz is physically rigid and chemically stable, it maintains this frequency much more accurately than simple RC (Resistor-Capacitor) oscillators. --- ### 4. Common Applications The ATS-49-R is a "workhorse" component found in: * **Consumer Electronics**: TV remotes, toys, and kitchen appliances. * **Computing**: Motherboards and peripheral devices (mice/keyboards). * **Industrial**: PLCs and sensor nodes. * **Communication**: Modems and routers. --- ### 5. Implementation Circuit To use an ATS-49-R, it is typically paired with two small ceramic capacitors (often 18pF to 22pF) connected to ground. This creates a **Pierce Oscillator** circuit. ```c [Microcontroller] / \ XTAL1 XTAL2 | | +----[Crystal]----+ | | [Cap] [Cap] | | GND GND ```