The part number **DM05CA102DO3-ST-R02** typically refers to a high-precision, high-reliability **Silver Mica Capacitor** manufactured by Cornell Dubilier (CDE) or a similar specialized manufacturer. These components are renowned for their stability and low loss in RF (Radio Frequency) applications. --- ### 1. Technical Specifications Breakdown | Parameter | Specification | Description | |:---|:---|:---| | **Capacitance** | 1000 pF (1nF) | Indicated by "102" (10 followed by 2 zeros) | | **Tolerance** | ±0.5 pF or ±0.5% | High precision for stable timing/tuning | | **Voltage Rating** | 500V DC (Typical for DM05) | High dielectric strength | | **Dielectric Material** | Silver Mica | Mineral-based, highly stable | | **Case Style** | DM05 (Dipped) | Compact radial leaded package | | **Operating Temp** | -55°C to +125°C | Industrial/Military grade range | --- ### 2. Key Features * **Temperature Stability:** Mica capacitors have an extremely low temperature coefficient, meaning their capacitance value stays constant even as heat fluctuates. * **Low Loss (High Q):** They exhibit very low dissipation factors, making them ideal for high-frequency oscillators and filters. * **Tight Tolerance:** Unlike ceramic capacitors which can vary wildly, these are often produced with 1% or 0.5% precision. * **Non-Aging:** Silver Mica does not degrade significantly over time compared to electrolytic or some ceramic dielectrics. --- ### 3. Application Use Cases 1. **RF Oscillators:** Used to set the frequency in radio transmitters and receivers. 2. **Filter Networks:** Excellent for band-pass and low-pass filters where sharp cutoff frequencies are required. 3. **Snubber Circuits:** Used in high-voltage pulse applications due to their ability to handle dV/dt (voltage spikes). 4. **Audio Equipment:** Sometimes used in high-end tube amplifiers for signal coupling where "transparency" is desired. --- ### 4. Comparison with Other Capacitors | Feature | Silver Mica (DM05) | Ceramic (MLCC) | Film Capacitor | |:---|:---|:---|:---| | **Stability** | Excellent | Poor to Good | Good | | **Size** | Large/Bulky | Very Small | Medium | | **Cost** | Expensive | Very Cheap | Moderate | | **Voltage** | High | Low to High | Moderate |