Based on the part number **DM19FA102DO3-ST-R02**, this component is a high-precision **Mica Capacitor** typically manufactured by companies like Cornell Dubilier (CDE). These capacitors are known for their extreme stability, high reliability, and low loss at high frequencies. --- ### 1. Component Specifications The part number can be broken down into specific technical parameters: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Series** | DM19 | Standard dipped silver mica capacitor size. | | **Capacitance** | 1000 pF (102) | 10 followed by 2 zeros in picofarads. | | **Tolerance** | ±0.5% (D) | Extremely tight precision tolerance. | | **Voltage** | 100V (F) | Rated DC working voltage (FA code variation). | | **Temperature Range** | -55°C to +125°C | Characteristic O (Stability range). | | **Termination** | ST | Straight leads (Standard). | | **Packaging** | R02 | RoHS compliant / Tape & Reel or specific batch code. | --- ### 2. Key Features * **High Stability:** Silver mica is one of the most stable dielectric materials available. The capacitance value changes very little over time or with temperature fluctuations. * **Low Dissipation Factor:** Excellent for high-frequency applications where energy loss must be minimized. * **Voltage Withstand:** High dielectric strength relative to its physical size. * **Tight Tolerance:** The "D" rating (±0.5%) makes it suitable for tuning and timing circuits where precision is critical. --- ### 3. Common Applications Due to its precision and stability, this part is commonly used in: * **RF Oscillators:** Maintaining frequency stability in radio transmitters. * **Filter Circuits:** High-Q filters for telecommunications. * **Pulse Circuits:** Handling high-speed transitions without degradation. * **Aerospace & Defense:** Where long-term reliability in harsh environments is required. --- ### 4. Comparison with Other Dielectrics | Feature | Silver Mica (DM19) | Ceramic (MLCC) | Film Capacitor | | :--- | :--- | :--- | :--- | | **Stability** | Excellent | Moderate to Poor | Good | | **Precision** | Very High (up to 0.5%) | Low to Moderate | Moderate | | **Frequency Response** | High Frequency | Variable | Low to Mid Frequency | | **Cost** | High | Low | Moderate |