The part number **MHO+27FAG-R** typically refers to a high-precision **SMD (Surface Mount Device) Quartz Crystal Oscillator**. These components are essential in electronics for generating a stable clock frequency used to synchronize data and operations within a circuit. Below is a detailed breakdown of the electronic specifications and characteristics of this component. --- ### 1. General Specifications Based on standard naming conventions for the MHO series (often manufactured by companies like Mercury Electronic), here are the typical technical parameters: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Component Type** | XO (Crystal Oscillator) | Active oscillator with internal circuitry. | | **Frequency** | 27.000 MHz | The base operating frequency. | | **Output Type** | HCMOS / TTL | Compatible with most digital logic circuits. | | **Package Size** | 5.0 x 7.0 mm | Standard 4-pad ceramic SMD package. | | **Supply Voltage** | 3.3V or 5.0V | Dependent on specific sub-series (usually 3.3V). | | **Stability** | ±25ppm to ±100ppm | Frequency variance over temperature range. | --- ### 2. Breakdown of the Part Number While naming conventions can vary slightly by manufacturer, the suffix **"R"** usually denotes the packaging format. * **MHO:** Series identifier (High-stability Metal/Ceramic Hybrid Oscillator). * **27:** Represents the nominal frequency (27 MHz). * **FAG:** Internal manufacturer code for frequency stability and operating temperature range (e.g., -40°C to +85°C). * **-R:** Indicates **Tape & Reel** packaging for automated pick-and-place assembly. --- ### 3. Pin Configuration These oscillators typically feature 4 pads on the bottom of the ceramic housing: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Enable/Disable (E/D) | Tri-state function (High = Output, Low = High Impedance). | | **2** | GND | Ground connection. | | **3** | Output | The 27MHz clock signal output. | | **4** | Vdd | Positive power supply input. | --- ### 4. Key Applications Because 27 MHz is a standard fundamental frequency, this part is commonly found in: * **Video Equipment:** Used in HDMI controllers and digital video processing. * **Networking:** Ethernet controllers and wireless communication modules. * **Microcontrollers:** Providing the external "heartbeat" for high-speed MCUs. * **USB Controllers:** Often used as a reference clock for USB 2.0/3.0 interfaces. --- ### 5. Circuit Design Tip When integrating the MHO+27FAG-R into a PCB layout, it is critical to place a **0.01µF to 0.1µF bypass capacitor** as close as possible to the Vdd (Pin 4) and GND (Pin 2) to minimize electrical noise and ensure frequency stability.