The part number **DM19EE100DO3-ST-R02** typically refers to a high-precision **Mica Capacitor** manufactured by companies like Cornell Dubilier (CDE). These components are known for their extreme stability, high Q factor, and reliability in RF applications. --- ### 1. Part Number Breakdown Based on standard industry nomenclature for silver mica capacitors, here is the functional breakdown: | Segment | Meaning | Description | | :--- | :--- | :--- | | **DM19** | Case Size/Style | Standard dipped mica package size (approx. 18.0 x 13.0 mm). | | **EE** | Voltage Rating | Typically indicates 2500V DC operating voltage. | | **100** | Capacitance Code | The value in picofarads (pF). 100 = **10 pF**. | | **D** | Tolerance | Indicates **±0.5 pF** (Precision tolerance). | | **O3** | Temp. Range | Standard operating temperature range (usually -55°C to +125°C). | | **ST** | Lead Type | Straight leads (radial configuration). | | **R02** | Packaging/Rev | Internal manufacturer revision or specific tape/reel packaging code. | --- ### 2. Key Technical Specifications These parts are engineered for performance in demanding circuits where drift must be minimized. * **Dielectric:** Silver Mica (Natural mineral). * **Capacitance:** 10 pF. * **Tolerance:** ±0.5 pF (extremely tight). * **Voltage:** 2500 VDC (High voltage capability). * **Temperature Coefficient:** Very low (typically 0 to +70 ppm/°C), ensuring values stay constant despite heat. * **Quality Factor (Q):** Very high, leading to low losses at high frequencies. --- ### 3. Common Applications Due to its high voltage rating and precision, this specific part is usually found in: 1. **RF Transmitters:** Used in tank circuits and tuning stages where high power and frequency stability are required. 2. **Impedance Matching:** Used in high-power antenna tuners. 3. **Pulse Circuits:** Capable of handling rapid dV/dt (voltage changes) without degrading. 4. **Laboratory Instrumentation:** Used in calibration equipment where capacitance must remain fixed over years of use. --- ### 4. Comparison with Other Dielectrics | Feature | Silver Mica (DM19) | Ceramic (MLCC) | Film Capacitor | | :--- | :--- | :--- | :--- | | **Stability** | Excellent | Variable (Class 2) | Good | | **High Voltage** | Very High | Limited in small sizes | High | | **Loss (ESR)** | Extremely Low | Low | Moderate | | **Cost** | High | Low | Moderate |