The part number **DM19CE102JO3-ST-R02** refers to a high-precision **Mica Capacitor** manufactured by Cornell Dubilier (CDE). These components are known for their exceptional stability and high frequency performance. --- ## 1. Technical Specifications Below is a breakdown of the electronic parameters for this specific component: | Parameter | Value / Specification | | :--- | :--- | | **Capacitance** | 1,000 pF (1 nF) | | **Tolerance** | ±5% (indicated by 'J') | | **Voltage Rating** | 100V DC | | **Dielectric Material** | Silver Mica | | **Operating Temperature** | -55°C to +125°C | | **Package Type** | Radial Leaded (Dipped) | | **Case Size** | DM19 (Standard large case) | --- ## 2. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: * **DM19**: Denotes the physical case size and style (Standard Dipped Mica). * **CE**: Temperature coefficient/characteristic (typically low drift). * **102**: The capacitance code. `10` followed by `2` zeros = 1000 pF. * **J**: Tolerance code (J = ±5%). * **O3**: Voltage rating code (100V). * **ST**: Lead style/spacing (Straight leads). * **R02**: Internal manufacturing/packaging suffix (often refers to RoHS compliance or specific taping). --- ## 3. Key Electronic Properties ### A. Stability and Precision Silver mica capacitors are famous for their **very low temperature coefficient**. Unlike ceramic capacitors (like Y5V or X7R), the capacitance of a mica capacitor remains extremely stable regardless of temperature fluctuations or applied voltage. ### B. High Q Factor These parts have a very high "Quality Factor" (Q). This means they have minimal internal resistance (ESR) and energy loss, making them ideal for high-frequency RF (Radio Frequency) circuits. ### C. Voltage Endurance Mica is a robust natural mineral. It does not suffer from "piezoelectric noise" (ringing) and can handle significant voltage spikes compared to multi-layer ceramic capacitors of the same size. --- ## 4. Typical Applications Due to their cost and stability, they are used where precision is non-negotiable: 1. **RF Oscillators:** Maintaining a stable frequency in radio transmitters. 2. **Filter Networks:** Precision tuning in high-fidelity audio or signal processing. 3. **Pulse Circuits:** Handling high-speed transitions without degrading. 4. **Calibration Equipment:** Used as reference standards in measurement tools.