The **MHO+21FAAD-R** is a high-performance **Crystal Oscillator (XO)** manufactured by MtronPTI. It is a surface-mount component designed to provide a precise and stable clock signal for electronic circuits. --- ## 1. Component Overview The MHO series is known for its high-reliability "H" style package, which is frequently used in telecommunications, data processing, and industrial applications where timing precision is critical. ### Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Package Type** | 5.0 x 7.0 mm (6-Pad) SMD | | **Output Type** | HCMOS / TTL | | **Supply Voltage (Vcc)** | 3.3V (Standard for +21 code) | | **Frequency Stability** | ±100 ppm (Typical for FA code) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **RoHS Status** | Compliant (R suffix) | --- ## 2. Part Number Breakdown To understand the specific capabilities of this part, we can decode the nomenclature: * **MHO**: Series designation (MtronPTI High-Reliability Oscillator). * **+**: Lead-free/RoHS compliant indicator. * **21**: Voltage code (typically indicates **3.3V** operation). * **F**: Frequency Stability code (commonly **±100ppm** over temperature). * **AA**: Temperature Range code (standard industrial **-40°C to +85°C**). * **D**: Output Duty Cycle (typically **40/60%** or **45/55%** symmetry). * **-R**: Tape and Reel packaging. --- ## 3. Pin Configuration The physical layout of the 5x7mm package usually follows the industry standard for 6-pad oscillators: 1. **Pad 1: Tri-state (Enable/Disable)** - Allows the output to be turned off to save power. 2. **Pad 2: No Connect (NC)**. 3. **Pad 3: Case Ground**. 4. **Pad 4: Output** - The clock signal (HCMOS). 5. **Pad 5: No Connect (NC)**. 6. **Pad 6: Supply Voltage (Vcc)**. --- ## 4. Typical Applications Because of its stability and industrial temperature rating, this part is found in: * **Networking Gear:** Switches, routers, and gateways. * **Embedded Systems:** Microcontrollers requiring external clock sources. * **Storage:** Fiber channel and SATA controllers. * **Industrial Automation:** PLCs and sensor hubs.