The term **CDR10** typically refers to high-reliability **Ceramic Dielectric Fixed Capacitors**, specifically those manufactured under military specifications (such as MIL-PRF-55681). These are Surface Mount Technology (SMT) components used in aerospace, defense, and high-performance industrial electronics. --- ### 1. Technical Specifications The CDR10 designation defines the physical size, dielectric material, and performance characteristics of the capacitor. | Feature | Specification Details | | :--- | :--- | | **Case Size** | 1210 (Metric: 3225) | | **Dimensions** | Approx. 3.2mm x 2.5mm | | **Dielectric Type** | Usually BP (NPO/COG) or BX (X7R equivalent) | | **Voltage Range** | Typically 50V to 100V | | **Capacitance Range** | 1.0 pF to 1.0 µF (depending on dielectric) | | **Termination** | Usually Solderable (Silver/Nickel/Tin or Lead-containing) | --- ### 2. Key Internal Parts and Construction A CDR10 capacitor is a **Multilayer Ceramic Capacitor (MLCC)**. Its internal architecture consists of several critical layers: 1. **Ceramic Dielectric:** High-purity ceramic material that determines the thermal stability and capacitance value. 2. **Internal Electrodes:** Thin layers of metal (often Palladium-Silver or Nickel) interleaved to create the capacitive effect. 3. **Termination Barriers:** * **Inner Layer:** Silver-Glass frit for adhesion. * **Barrier Layer:** Nickel plating to prevent "leaching" during soldering. * **Outer Layer:** Tin/Lead (Sn/Pb) or pure Tin finish for electrical connection. --- ### 3. Part Number Decoding (Standard Military Format) When looking at a CDR10 part number (e.g., `CDR10BP101BJSM`), the code breaks down as follows: * **CDR10:** Style (Size 1210). * **BP:** Dielectric characteristic (Temperature Coefficient). * **101:** Capacitance code (10 + one zero = 100pF). * **B:** Capacitance Tolerance (e.g., ±5%). * **J:** Voltage rating. * **S:** Termination finish. * **M:** Failure rate level (indicates reliability testing intensity). --- ### 4. Applications Due to their "CDR" (Established Reliability) rating, these parts are used where failure is not an option: * **Avionics:** Flight control systems. * **Military Communications:** Radio and satellite hardware. * **Space:** Satellite power supplies. * **Medical:** Life-support diagnostic equipment.