The **MP098B** is a specific surface-mount crystal oscillator part number, typically associated with frequency control components manufactured by companies like **CTS Electronic Components**. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Overview The MP098B belongs to a series of HC-49/U type surface-mount (SMD) microprocessor crystals. These components are used to provide a precise clock signal for microcontrollers, digital signal processors (DSPs), and other logic circuits. ### 2. Technical Specifications The "098" in the part number usually refers to the nominal frequency. In this series, the MP098B typically operates at **9.8304 MHz**. | Parameter | Typical Value | | :--- | :--- | | **Frequency** | 9.8304 MHz | | **Package Type** | HC-49/U (SMD Version) | | **Frequency Tolerance** | ±30 ppm (Standard) | | **Frequency Stability** | ±50 ppm | | **Operating Temperature** | -20°C to +70°C (Standard) | | **Load Capacitance** | 18pF to 32pF (Varies by specific suffix) | | **Shunt Capacitance** | 7.0 pF Maximum | | **Drive Level** | 100 µW to 1000 µW | | **Aging** | ±3 ppm per year | --- ### 3. Key Electronic Components & Features * **AT-Cut Quartz Crystal:** The core of the device is a precision-cut quartz plate. The "AT-cut" provides excellent temperature stability compared to other cuts. * **Metal Can Packaging:** The internal crystal is housed in a resistance-welded metal package. This provides **Electro-Magnetic Interference (EMI)** shielding and protects the crystal from environmental moisture. * **SMD Form Factor:** Unlike through-hole crystals, the "MP" series features metal "wings" or pads that allow it to be soldered directly onto the surface of a PCB, making it compatible with high-speed automated assembly. ### 4. Circuit Implementation To use the MP098B, it is typically connected to the `XTAL1` and `XTAL2` pins of a microcontroller in a **Pierce Oscillator** configuration. ```c // Typical connection logic [MCU] |-- XTAL1 ----[ C1 ]---- GND |-- XTAL2 ----[ C2 ]---- GND | | |--[ MP098B Crystal ]--| ``` * **Load Capacitors (C1, C2):** These are essential for the crystal to oscillate at the correct frequency. For a 9.8304 MHz crystal, these are usually between 18pF and 22pF. --- ### 5. Common Applications * **Baud Rate Generation:** 9.8304 MHz is a "magic frequency" that can be divided down perfectly to create standard RS-232 baud rates (like 9600, 19200, and 115200) with 0% error. * **Microcontrollers:** Serving as the primary system clock for 8-bit and 16-bit MCUs. * **Communication Equipment:** Modems and serial interfaces.