The part number **DM19EE151DO3-SA-R02** refers to a high-precision, high-reliability silver mica capacitor, typically manufactured by companies like **Cornell Dubilier (CDE)** or under specific military/industrial standards. These capacitors are renowned for their stability, low loss, and high resistance to environmental stress. --- ### Technical Specifications | Parameter | Specification | Description | | :--- | :--- | :--- | | **Capacitance** | 150 pF | The "151" in the code represents 150 (15 followed by 1 zero). | | **Tolerance** | ±0.5% or ±1% | The "D" or "F" codes usually indicate tight precision. | | **Voltage Rating** | 500V DC | Standard operating voltage for the DM19 frame size. | | **Dielectric** | Silver Mica | Provides excellent temperature stability. | | **Case Style** | DM19 (CM06) | A standard physical size for dipped mica capacitors. | | **Operating Temp** | -55°C to +125°C | Designed for extreme industrial and military environments. | --- ### Breakdown of Part Number Nomenclature While specific vendor prefixes may vary slightly, the structure generally follows this logic: 1. **DM19**: Refers to the physical case size and style (Dipped Mica, size 19). 2. **EE**: Indicates the characteristic/temperature coefficient (typically 0 to +70 ppm/°C). 3. **151**: The capacitance value (150 picofarads). 4. **D / J**: The tolerance code (D is typically ±0.5pF or tight percentage). 5. **O3**: Voltage rating code (often 500V). 6. **SA-R02**: Specific suffix for packaging (e.g., Ammo pack or Reel) and lead formation (Straight or Crimped). --- ### Key Features & Applications #### Features * **Low Dissipation Factor:** Extremely low energy loss during operation. * **High dV/dt:** Can handle rapid changes in voltage without degradation. * **Stability:** Capacitance remains nearly constant regardless of time, voltage, or frequency. * **Non-Inductive:** Ideal for high-frequency RF applications. #### Common Applications * **RF Oscillators:** Used to set precise frequencies. * **Tuning Circuits:** Found in radio transmitters and receivers. * **Pulse Circuits:** High voltage handling makes them suitable for snubbers. * **Laboratory Equipment:** Used where measurement precision is critical. --- ### Comparison: Mica vs. Ceramic Capacitors | Feature | Silver Mica (DM19) | Ceramic (MLCC) | | :--- | :--- | :--- | | **Stability** | Very High | Moderate to Low | | **Precision** | Excellent (0.5% - 1%) | Standard (5% - 20%) | | **Aging** | Negligible | Can drift over years | | **Cost** | High | Low |