The part number **CDR32BP621BFURAJ** refers to a high-reliability, military-grade surface mount multilayer ceramic capacitor (MLCC). This specific component is manufactured following the **MIL-PRF-55681** standard, which is required for defense, aerospace, and high-reliability industrial applications. --- ### Part Number Breakdown To understand the electronic characteristics, we can decode the part number according to military specifications: | Segment | Code | Meaning | | :--- | :--- | :--- | | **Series** | CDR32 | MIL-PRF-55681, Style 0805 Size | | **Dielectric** | BP | COG/NPO (Ultra-stable, low loss) | | **Capacitance** | 621 | 620 pF (62 followed by 1 zero) | | **Tolerance** | B | ±0.10 pF (Tight precision) | | **Voltage** | F | 50 Volts | | **Termination** | U | Termination: Copper barrier, Tin/Lead (Sn/Pb) plated | | **Reliability** | R | Established Reliability (Level R: 0.01% per 1,000 hrs) | | **Packaging** | AJ | 7" Reel / Standard commercial/military finish | --- ### Key Technical Specifications These are the physical and electrical parameters that define how the part functions in a circuit: #### 1. Capacitance & Precision * **Value:** 620 pF. * **Tolerance:** ±0.10 pF. This is an extremely tight tolerance, making it ideal for precision timing, filtering, and frequency-matching circuits. #### 2. Temperature Coefficient (BP / NPO) * The "BP" designation indicates a **Class I dielectric**. * **Stability:** It is ultra-stable, meaning its capacitance does not change significantly with changes in temperature, voltage, or time. * **Operating Range:** Typically -55°C to +125°C. #### 3. Reliability and Testing * **Established Reliability (ER):** The "R" failure rate level means the part has undergone rigorous life testing to ensure high MTBF (Mean Time Between Failures). * **Termination:** The "U" termination contains **lead (Pb)**. This is often preferred in military/aerospace sectors to prevent "tin whiskers," which can cause short circuits in pure-tin (RoHS compliant) components. #### 4. Physical Dimensions (0805 Metric 2012) * **Length:** 2.00 mm (± 0.30) * **Width:** 1.25 mm (± 0.30) --- ### Common Applications Due to its military qualification and high stability, this part is typically found in: * **RF Oscillators:** Maintaining stable frequencies. * **Filter Networks:** High-Q circuits where low loss is critical. * **Avionics:** Systems requiring high resistance to environmental stress. * **Medical Imaging:** Where precision and longevity are required.