The part number **DM05FA151DO3-ST-R02** refers to a high-precision **Mica Capacitor** typically manufactured by Cornell Dubilier (CDE) or similar specialized manufacturers. These components are known for their extreme stability and reliability in RF (Radio Frequency) applications. --- ### 1. Technical Specification Breakdown The alphanumeric code provides specific details about the component's construction and performance: | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | DM05 (or Mini-Mica) | Small case size, high-frequency design. | | **Capacitance** | 151 | **150 pF** (15 followed by one zero). | | **Tolerance** | D | **±0.5 pF** (Precision tolerance). | | **Voltage** | O3 | Typically rated for **100V - 500V** DC. | | **Operating Temp** | -55°C to +125°C | Standard industrial/military range. | --- ### 2. Key Characteristics Mica capacitors are chosen over ceramic or electrolytic types for specific performance reasons: * **High Stability:** They exhibit very little change in capacitance over time or varying temperatures. * **Low Loss (High Q):** They have a very high "Quality Factor," meaning they lose very little energy as heat, making them ideal for high-frequency filters. * **Precision:** The "D" tolerance (±0.5 pF) indicates this is a high-precision part used where exact timing or frequency tuning is required. * **Durability:** Mica is a natural mineral that does not degrade like the dielectric materials in some other capacitor types. --- ### 3. Common Applications Because of its 150 pF value and high stability, this part is generally found in: 1. **RF Oscillators:** Used to set the frequency in radio transmitters and receivers. 2. **Tuned Circuits:** Essential for LC (Inductor-Capacitor) resonance circuits. 3. **Pulse Handling:** Used in circuits with fast rise times where stability under stress is needed. 4. **Audio Equipment:** Sometimes used in high-end audio crossovers or filters for clean signal paths. --- ### 4. Physical Dimensions (Typical DM05 Style) ```text Approximate Size: Length: ~11.4 mm Width: ~4.3 mm Height: ~9.1 mm Lead Spacing: 3.0 mm to 5.0 mm (Radial Leads) ```