The **ABM2-B4WAA2-R** is a specific surface-mount (SMD) quartz crystal component manufactured by **Abracon**. This part belongs to the ABM2 series, which is widely used for providing stable timing and clock signals in electronic circuits. ### 1. Technical Specifications The part number follows a specific coding structure. Here is the breakdown of its core characteristics: | Parameter | Specification | | :--- | :--- | | **Component Type** | Quartz Crystal (Passive) | | **Frequency** | 12.000 MHz (Standard for this series) | | **Package Size** | 8.0 x 4.5 x 1.4 mm (Ceramic) | | **Mounting Type** | Surface Mount (SMD) | | **Terminations** | 4-Pad Lead-free / RoHS Compliant | | **Frequency Tolerance** | ±30 ppm | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | --- ### 2. Key Features and Usage This component is designed for durability and precision. Below are the functional aspects of the ABM2-B4WAA2-R: * **Hermetic Sealing:** The glass-to-metal or seam-sealed ceramic package ensures long-term frequency stability by protecting the quartz from moisture and environmental contaminants. * **Low ESR:** It features a low Equivalent Series Resistance, which helps in reducing power consumption and ensures easy oscillation startup. * **Applications:** * **Microcontrollers:** Providing the external clock source for MCUs. * **Connectivity:** Used in Wi-Fi, Bluetooth, and Zigbee modules. * **Industrial:** Suitable for sensors and control systems due to the wide temperature range. --- ### 3. Connection Diagram (Typical) The 4-pad layout is standard for SMD crystals, where two pins are connected to the crystal element and two are grounded to the metal lid for EMI reduction. ```text Pad 1: Crystal Terminal 1 Pad 2: GND (Connected to metal lid) Pad 3: Crystal Terminal 2 Pad 4: GND (Connected to metal lid) ``` --- ### 4. Circuit Implementation When designing a PCB for this part, "load capacitors" ($C_L$) are required to match the crystal's specified load capacitance (usually around 18pF or 20pF for this series). ```c // Example: Formula for Load Capacitance calculation // CL = (C1 * C2) / (C1 + C2) + Cstray ```