The **DM05EC100JO3-SA-R02** is a high-precision, high-reliability **Mica Capacitor** manufactured by Cornell Dubilier (CDE). These capacitors are specifically known for their stability and low loss in high-frequency applications. --- ## 1. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Capacitance** | 10 pF (Picofarads) | | **Tolerance** | ±5% (indicated by 'J') | | **Voltage Rating** | 300 VDC | | **Dielectric Material** | Silver Mica | | **Case Style** | Dipped Mica (Radial Leads) | | **Temperature Range** | -55°C to +125°C | | **Case Size Code** | DM05 (Standard miniature size) | --- ## 2. Component Breakdown ### A. Material: Silver Mica Mica is a naturally occurring mineral that is chemically inert and physically stable. In this capacitor, silver electrodes are screened onto mica sheets. This construction offers several benefits: * **Low Drift:** The capacitance value remains very stable over time and temperature. * **High Q Factor:** Extremely low losses, making it ideal for RF (Radio Frequency) circuits. * **High Voltage Handling:** Mica has excellent dielectric strength. ### B. Part Number Decoder While specific manufacturer prefixes vary, the code typically breaks down as follows: * **DM05:** Refers to the physical dimensions and housing style (Dipped Mica, Size 05). * **EC:** Represents the characteristic (temperature coefficient and drift requirements). * **100:** The capacitance value in pF. The first two digits are significant; the third is the multiplier (10 x 10^0 = 10pF). * **J:** Tolerance code (J = ±5%). * **O3:** Voltage rating code (O3 usually denotes 300V for this series). --- ## 3. Key Applications Because of its precision and stability, this part is commonly used in: 1. **RF Oscillation Circuits:** Used where frequency stability is critical. 2. **Tuning Circuits:** Found in radio transmitters and receivers. 3. **Pulse Handling:** Suitable for high dV/dt applications due to its rugged construction. 4. **Filters:** High-order filters requiring tight tolerances and low temperature coefficients. --- ## 4. Advantages vs. Disadvantages ### Advantages * **Temperature Stability:** Minimal change in capacitance across its operating range. * **Precision:** Available in very tight tolerances compared to ceramic disc capacitors. * **Reliability:** Long life span with very low failure rates. ### Disadvantages * **Size:** Larger than modern ceramic SMD (Surface Mount) capacitors of the same value. * **Cost:** Significantly more expensive than standard ceramic capacitors due to the raw material (Mica) and manufacturing process. ---