The part number **DM19CC102DO3-SA-R02** refers to a high-precision, high-voltage Silver Mica Capacitor, typically manufactured by companies like **Cornell Dubilier (CDE)**. These components are renowned for their stability and low loss in RF (Radio Frequency) applications. --- ### 1. Technical Specification Table | Parameter | Specification | Description | | :--- | :--- | :--- | | **Capacitance** | 1000 pF (1.0 nF) | The storage capacity of the device. | | **Tolerance** | ±0.5% | Extremely high precision for tuning circuits. | | **Voltage Rating** | 300V - 500V DC | High voltage threshold (standard for DM19 series). | | **Dielectric Material** | Silver Mica | Provides excellent temperature stability. | | **Case Style** | DM19 | Large dipped package for higher power/voltage. | | **Operating Temp** | -55°C to +125°C | Military-grade temperature range. | | **Termination** | Radial Leads | Standard through-hole mounting. | --- ### 2. Breakdown of Part Number Nomenclature While exact coding can vary slightly by manufacturer series, the standard breakdown for this part type is as follows: * **DM19:** Represents the physical size and case style (standard "dipped" mica). * **CC:** Temperature coefficient and characteristic code. * **102:** Capacitance code (10 followed by 2 zeros = 1000 pF). * **D:** Tolerance code (D usually signifies ±0.5 pF or a percentage depending on base value). * **O3:** Voltage or internal designator. * **SA-R02:** Specific lead finish (likely RoHS compliant) and packaging/revision markers. --- ### 3. Key Electronic Characteristics #### A. High Stability and Q-Factor Silver mica capacitors are used when "Q" (Quality Factor) is critical. They exhibit very low inductive and resistive losses, making them ideal for high-frequency filters. #### B. Capacitance Drift Unlike ceramic capacitors (like Y5V or X7R), mica capacitors do not significantly change their capacitance over time or with changes in applied voltage. #### C. Typical Applications * **RF Oscillators:** Maintaining a steady frequency. * **Transmitters:** Handling high power in radio equipment. * **Precision Filters:** Where sharp cut-off frequencies are required. * **Pulse Circuits:** Due to their ability to handle high dV/dt (voltage spikes). ---