Based on the part number **I630-63BC9O2-155.520**, this component is a high-precision **Voltage Controlled Crystal Oscillator (VCXO)** or a standard **Crystal Oscillator**, likely manufactured by a company like ILSI (an MMD Monitor/Quartztek brand) or a similar frequency control specialist. The alphanumeric string defines the physical characteristics, electrical performance, and output frequency. --- ### Part Number Breakdown | Segment | Meaning | Specification Details | | :--- | :--- | :--- | | **I630** | **Series/Package** | 5.0 x 3.2 mm Surface Mount Device (SMD) with 6 pads. | | **63** | **Operating Voltage** | Typically represents **3.3V** DC power supply. | | **B** | **Frequency Stability** | Usually denotes **±50 ppm** (parts per million). | | **C** | **Temp Range** | Commercial temperature range: **0°C to +70°C**. | | **9** | **Duty Cycle** | Standard **45/55%** symmetry. | | **O2** | **Output Type** | **LVPECL** (Low-Voltage Positive Emitter-Coupled Logic). | | **155.520** | **Frequency** | **155.520 MHz** (standard telecommunications frequency). | --- ### Technical Specifications #### 1. Signal Output: LVPECL The "O2" code signifies **LVPECL**. This is a differential signaling standard used for high-speed data transmission because it offers: * Low jitter (cleaner signal). * Fast transition times. * Good noise immunity. #### 2. Target Frequency: 155.520 MHz This is a specific "Golden Frequency" used extensively in networking infrastructure. It is the base clock frequency for: * **SONET/SDH:** Specifically OC-3/STM-1 transmission rates. * **ATM:** Asynchronous Transfer Mode. * **Fiber Channel:** High-speed storage networking. #### 3. Physical Form Factor The **5032 (5.0mm x 3.2mm)** package is an industry-standard size. It features a seam-welded metal lid on a ceramic substrate, which provides high reliability and protects the quartz crystal inside from environmental interference. --- ### Key Applications * **Optical Networking:** SFP/SFP+ transceiver modules. * **Telecommunications:** Base stations and backhaul equipment. * **Data Centers:** High-speed Ethernet switches and routers. * **Test & Measurement:** High-frequency signal generators. ---