The part number **CDR31BX102BFURAJ** refers to a high-reliability, military-grade surface mount multilayer ceramic capacitor (MLCC). This specific component is manufactured under the **MIL-PRF-55681** standard, which governs capacitors used in critical defense and aerospace applications. --- ### ## Technical Specifications Breakdown The part number is a coded string where each character defines a specific physical or electrical characteristic: | Code Segment | Parameter | Value / Description | | :--- | :--- | :--- | | **CDR31** | Style/Size | EIA 0805 Case Size (2.0mm x 1.25mm) | | **BX** | Dielectric | BX (Similar to X7R; ±15% Stability) | | **102** | Capacitance | 1,000 pF (1.0 nF) | | **B** | Voltage | 100 Volts | | **F** | Tolerance | ±1% (Precision tolerance) | | **U** | Termination | Tin/Lead (SnPb) finish (Solderable) | | **R** | Failure Rate | 0.01% per 1,000 hours (Level R) | | **AJ** | Packaging | 7" Reel / Special Marking | --- ### ## Key Features 1. **Military Grade Reliability:** Unlike commercial capacitors, this part is qualified for "Established Reliability" (ER). The "R" failure rate indicates it has undergone rigorous life testing. 2. **BX Dielectric:** This is a stable dielectric material. While it behaves similarly to X7R (temperature stable), it has stricter requirements for voltage-temperature limits mandated by military specs. 3. **High Precision:** A **±1% (F)** tolerance is very tight for a ceramic capacitor, making it suitable for tuning, timing, or high-precision filtering circuits. 4. **Termination (Tin/Lead):** The "U" termination contains lead, which is often preferred in aerospace and military sectors to prevent "tin whiskering," a phenomenon that can cause short circuits in pure tin components. --- ### ## Common Applications * **Aerospace Electronics:** Navigation systems and flight controls where failure is not an option. * **Defense Systems:** Radar, communication arrays, and electronic warfare modules. * **Decoupling/Filtering:** Used in high-reliability power supplies to filter high-frequency noise. * **RF Circuits:** Due to the tight 1% tolerance, it can be used in sensitive RF paths. --- ### ## Example Circuit Integration If you were to represent this in a netlist or CAD tool, it would look like this: ```spice * Component: CDR31BX102BFURAJ * 1nF 100V 1% Tol 0805 Case C1 Node1 Node2 1.0nF ```