The part number **DM05FE102DO3-SA-R02** refers to a high-precision **Mica Capacitor** manufactured by **Cornell Dubilier Electronics (CDE)**. These capacitors are known for their extreme stability and reliability in RF (Radio Frequency) and high-frequency applications. --- ### 1. Technical Specifications Breakdown | Feature | Specification | Description | | :--- | :--- | :--- | | **Capacitance** | 1000 pF (1 nF) | The electrical storage capacity. | | **Tolerance** | ±0.5% (D) | Extremely tight precision for timing circuits. | | **Voltage Rating** | 500 VDC | Maximum DC voltage it can withstand. | | **Dielectric Type** | Silver Mica | Provides low loss and high stability. | | **Operating Temp** | -55°C to +125°C | Standard industrial/military temperature range. | | **Case Type** | Dipped Mica | Protective epoxy coating for environmental resistance. | --- ### 2. Part Number Decoder Based on CDE’s standard nomenclature, the code can be broken down as follows: * **DM**: Standard Dipped Mica Capacitor series. * **05**: Case size (Physical dimensions, typically small "miniature" size). * **F**: Voltage characteristic (500V). * **E**: Temperature coefficient/characteristic (Standard mica performance). * **102**: Capacitance code (10 + 2 zeros = 1000 pF). * **D**: Tolerance code (±0.5%). * **O3**: Packaging/Lead spacing code. * **SA-R02**: Internal manufacturer suffix (usually denotes RoHS compliance and specific reel/packaging instructions). --- ### 3. Key Characteristics * **High Stability:** Silver mica capacitors exhibit very little change in capacitance over time or varying temperatures. * **Low Dissipation Factor:** They have very low "loss," making them ideal for high-Q (Quality factor) resonant circuits. * **Tight Tolerance:** The **0.5% tolerance** is much higher precision than standard ceramic (10-20%) or film capacitors. * **Reliability:** Mica is a natural mineral that does not degrade as quickly as synthetic dielectric materials. --- ### 4. Common Applications Because of their precision and stability, these parts are used in: 1. **RF Oscillators:** Maintaining a steady frequency in transmitters. 2. **Filter Networks:** High-precision tuning in telecommunications. 3. **Pulse Circuits:** Handling high-voltage surges in timing applications. 4. **Audio Equipment:** High-end audio crossovers where phase shift must be minimized. ---