The part number **DM05DA102JO3-SA-R02** refers to a high-precision, high-reliability **Mica Capacitor**. These components are frequently used in RF (Radio Frequency) circuits, telecommunications, and high-stability timing applications. --- ### 1. Technical Specifications Below are the typical specifications derived from the part number nomenclature (likely a **CDE - Cornell Dubilier** or similar manufacturer series): | Parameter | Specification | | :--- | :--- | | **Capacitance** | 1,000 pF (1nF) | | **Tolerance** | ±5% (indicated by 'J') | | **Voltage Rating** | 500V DC (Standard for DM05 series) | | **Dielectric Material** | Silver Mica | | **Case Type** | Dipped Mica (Radial Leads) | | **Operating Temp** | -55°C to +125°C | --- ### 2. Breakdown of the Part Number While nomenclature varies slightly by brand, the following is the standard structural breakdown for this series: * **DM05**: Refers to the physical case size and style (Miniature Dipped Mica). * **DA**: Represents the characteristic (temperature coefficient and drift). * **102**: The capacitance code. `10` followed by `2` zeros = 1,000pF. * **J**: Tolerance code. `J` stands for ±5%. * **O3**: Voltage rating indicator (commonly 500V or 300V depending on the manufacturer's specific catalog). * **SA**: Specific lead spacing or finish (Solderable Alloy). * **R02**: Revision or packaging code (often implies RoHS compliance or Tape & Reel/Bulk specifics). --- ### 3. Key Features & Applications #### Features * **High Stability:** Mica capacitors are known for extremely low capacitance drift over time. * **Low Loss:** Very high "Q" factor, making them ideal for high-frequency filters. * **Temperature Coefficient:** Extremely stable performance across a wide range of temperatures. * **Precision:** Unlike ceramic capacitors (which can vary with voltage), Mica maintains its value consistently. #### Common Applications 1. **RF Oscillators:** Used to set precise frequencies in radio transmitters. 2. **Filter Networks:** Critical in tuned circuits where a specific bandwidth must be maintained. 3. **Snubber Circuits:** Used in high-voltage environments to suppress voltage spikes. 4. **Audio Equipment:** High-end audio enthusiasts use them for their linear response and low distortion. --- ### 4. Comparisons | Feature | Mica (DM05) | Ceramic (MLCC) | Electrolytic | | :--- | :--- | :--- | :--- | | **Stability** | Excellent | Poor (Type II) / Good (C0G) | Poor | | **Voltage Range** | High | Low to Medium | Low to Medium | | **Size** | Bulky | Very Small | Medium | | **Cost** | High | Low | Low |