The part number **DM05CE102JO3-SA-R02** refers to a high-precision **Mica Capacitor**, typically manufactured by companies like Cornell Dubilier (CDE). These components are known for their extreme stability, low loss, and reliability in RF (Radio Frequency) applications. --- ### 1. Technical Specification Breakdown The alphanumeric code provides specific details regarding the capacitor's construction and performance: | Component Attribute | Specification | Description | |:---|:---|:---| | **Series** | DM05 | Miniature dipped silver mica capacitor. | | **Temperature Coeff.** | CE | Characteristic E (Temp. Range: -55°C to +125°C). | | **Capacitance Code** | 102 | 1000 pF (1.0 nF). The '2' indicates two zeros after 10. | | **Tolerance** | J | ±5% Tolerance. | | **Voltage Rating** | O3 | Typically represents 300V or 500V DC (varies by manufacturer series). | | **Finish/Packaging** | SA-R02 | Specific lead spacing and RoHS compliance coding. | --- ### 2. Key Features Mica capacitors like the DM05 series offer unique electronic characteristics that differentiate them from ceramic or electrolytic types: * **High Stability:** They exhibit very little change in capacitance over time or varying temperatures. * **Low Dissipation Factor:** High "Q" factor, making them ideal for high-frequency filters. * **Precision:** Tight tolerances (down to ±1% or ±0.5% in some versions) allow for exact circuit tuning. * **Voltage Withstand:** Excellent dielectric strength prevents arcing or breakdown under high-stress conditions. --- ### 3. Common Applications Due to their stability and high-frequency performance, these parts are found in: 1. **RF Oscillators:** Maintaining a steady frequency despite heat. 2. **Transmitters:** Used in coupling and decoupling circuits in radio equipment. 3. **Filter Networks:** Critical for sharp cutoff frequencies in audio and radio processing. 4. **Calibration Equipment:** Used as secondary standards for laboratory measurements. --- ### 4. Comparison with Ceramic Capacitors | Feature | Silver Mica (DM05) | Multilayer Ceramic (MLCC) | |:---|:---|:---| | **Aging** | Negligible | Can lose capacity over years | | **Voltage Coefficient** | Zero (Stable) | Capacity drops as voltage increases | | **Price** | Expensive | Very Cheap | | **Size** | Larger / Bulky | Microscopic / SMD |