Based on the part number **MHO+27TBD-R**, this component belongs to the **MHO Series** of high-frequency crystal oscillators, typically manufactured by companies like **MtronPTI**. These parts are designed for precision timing in telecommunications and data processing equipment. Below is a breakdown of the technical specifications and electronic characteristics associated with this part number. --- ## 1. Technical Specifications | Parameter | Specification | Description | | :--- | :--- | :--- | | **Frequency** | 27.000 MHz | The fundamental operating frequency of the crystal. | | **Output Type** | HCMOS / TTL | Compatible with high-speed CMOS and Transistor-Logic circuits. | | **Supply Voltage (Vcc)** | 5.0V (Standard) | Standard operating voltage for the MHO series. | | **Package Style** | 14-pin DIP (Full size) | Metal "Through-Hole" package providing excellent EMI shielding. | | **Operating Temp** | 0°C to +70°C | Commercial grade temperature range. | | **Stability** | ±100 ppm | Standard frequency stability over temperature. | --- ## 2. Key Electronic Features ### A. Frequency Control The "27" in the part number indicates a **27.000 MHz** frequency. This is a common frequency used for video processing, Ethernet controllers, and clock generation in embedded systems. ### B. Package and Construction The **MHO** designation refers to a full-size DIL (Dual-In-Line) 14-pin package (though often only 4 pins are physically present: Vcc, Ground, Output, and an NC or Tri-state pin). The metal casing is hermetically sealed to protect the quartz crystal from environmental moisture and to reduce Electromagnetic Interference (EMI). ### C. Output Waveform The device provides a square wave output. It is capable of driving loads up to 15pF or 50pF depending on the specific sub-revision, making it versatile for driving multiple IC clock inputs. --- ## 3. Pin Configuration (Typical) | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | N/C or Tri-State | No connection or Output Enable/Disable. | | **7** | GND | Case and circuit ground. | | **8** | Output | The 27MHz clock signal output. | | **14** | Vcc | +5.0V Power Supply. | --- ## 4. Part Number Breakdown (Estimated) * **MHO:** Series Prefix (Metal Hermetic Oscillator). * **+:** Usually indicates Lead-Free/RoHS Compliance. * **27:** Frequency (27 MHz). * **TBD:** Internal manufacturer codes for stability, duty cycle, and temperature range (T: 0/70°C; B: 5.0V; D: 100ppm). * **R:** Packaging code (often "RoHS" or "Tape & Reel" for smaller variants).