The **MHO+24TBD-R** is a specific type of **Crystal Oscillator** (specifically an HC-49/U or similar thru-hole package style) commonly used in timing circuits. It is designed to provide a stable clock signal for microprocessors and digital systems. Below is a detailed breakdown of its electronic specifications and characteristics. ### 1. Key Technical Specifications | Parameter | Specification (Typical) | | :--- | :--- | | **Frequency** | 24.000 MHz | | **Type** | Quartz Crystal Oscillator (Active) | | **Package Style** | 14-pin DIP (Full Size) or 8-pin DIP (Half Size) | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage (Vcc)** | +5.0V DC (Standard) | | **Frequency Stability** | ±25ppm to ±100ppm (depending on grade) | | **Operating Temperature** | -10°C to +70°C (Standard Industrial) | --- ### 2. Part Number Breakdown (Nomenclature) The prefix and suffix codes usually denote specific manufacturing standards: * **MHO:** Often refers to the series (Metal Hybrid Oscillator), indicating a hermetically sealed metal package. * **24:** Represents the fundamental frequency of **24.000 MHz**. * **TBD:** This often relates to the "Tightness" of stability and the "Duty Cycle" (usually 40/60%). * **R:** Generally indicates **RoHS Compliance** (Lead-free). --- ### 3. Pinout Configuration Since this is an active oscillator (it requires power to run), it follows a standard 14-pin DIP footprint (though only 4 pins are physically present): | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC / ED | No Connect or Output Enable/Disable | | **7** | GND | Circuit Ground | | **8** | Output | The 24MHz Square Wave Signal | | **14** | Vcc | +5V Power Supply | --- ### 4. Implementation Details Because the MHO+24TBD-R is an **active oscillator**, it differs from a passive crystal (XTAL) in the following ways: * **No Load Capacitors Needed:** Unlike passive crystals, you do not need external capacitors (C1, C2). * **Built-in Circuitry:** It contains the quartz crystal and the oscillation circuit (inverters/transistors) inside the metal can. * **Signal Output:** It generates a clean square wave rather than a sine wave, making it directly compatible with the clock input pins of MCUs and FPGAs. --- ### 5. Common Applications * **Microcontrollers:** Providing the primary clock for 8051, PIC, or AVR systems. * **Ethernet Controllers:** 24MHz is a common frequency for network interface cards. * **USB Controllers:** Often used in legacy USB hub designs. * **Legacy Computing:** Common in older PC motherboards and industrial automation boards.