The part number **DM05EY102JO3-ST-R02** refers to a high-precision **Mica Capacitor** manufactured by CDE (Cornell Dubilier Electronics). These capacitors are renowned for their stability, high reliability, and low loss at high frequencies. --- ## 1. Technical Specification Breakdown The alphanumeric code provides specific details about the capacitor's electrical characteristics: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Series** | DM05 | Miniature dipped mica capacitor series. | | **Temperature Coeff.** | EY | Characteristic E (-20 to +100 ppm/°C). | | **Capacitance** | 102 | 1,000 pF (10 followed by 2 zeros). | | **Tolerance** | J | ±5% (Standard precision for mica). | | **Voltage Rating** | O3 | 300 VDC (Working voltage). | | **Operating Temp.** | -55°C to +125°C | Military/Industrial grade range. | --- ## 2. Key Physical Properties ### Material: Silver Mica Mica is a natural mineral that is chemically inert, non-oxidizing, and physically stable. The "Silver Mica" design involves printing silver electrodes directly onto mica sheets, which are then stacked and encapsulated in an epoxy resin. ### Features * **High Q Factor:** Extremely low dissipation factor, making it ideal for RF (Radio Frequency) applications. * **Precision:** Very tight capacitance stability over time and temperature. * **Non-Inductive:** The construction minimizes internal inductance. --- ## 3. Common Applications Due to its high stability and voltage rating, this part is typically used in: 1. **RF Circuits:** Tuning circuits, oscillators, and filters where frequency stability is critical. 2. **Transmission:** Used in ham radio gear and commercial broadcasting equipment. 3. **Pulse Circuits:** High-speed snubber or timing circuits. 4. **Audio Equipment:** High-end vacuum tube amplifiers where low noise and high voltage handling are required. --- ## 4. Comparison with Other Dielectrics | Feature | Silver Mica (DM05) | Ceramic (MLCC) | Film Capacitor | | :--- | :--- | :--- | :--- | | **Stability** | Excellent | Poor (X7R) to Good (C0G) | Moderate | | **High Frequency** | Superior | Good | Moderate | | **Size** | Larger | Very Small | Large | | **Cost** | High | Low | Moderate |