The part number **DM05FE102JO3-SA-R02** refers to a high-precision **Mica Capacitor** manufactured by Cornell Dubilier (CDE). These capacitors are renowned for their stability, high reliability, and low loss at high frequencies. --- ### 1. Technical Specifications Below is a breakdown of the electrical characteristics of this specific component: | Parameter | Value / Specification | | :--- | :--- | | **Capacitance** | 1,000 pF (1.0 nF) | | **Tolerance** | ±5% (indicated by 'J') | | **Voltage Rating** | 500 VDC | | **Dielectric Material** | Silver Mica | | **Operating Temperature** | -55°C to +125°C | | **Case Style** | Dipped (Radial Leads) | | **Temperature Coefficient** | 0 to +70 ppm/°C | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying the physical and electrical constraints: * **DM05**: Refers to the physical case size and lead spacing (Standard dipped mica series). * **FE**: Indicates the characteristic/temperature coefficient (Standard stability). * **102**: The capacitance value. The first two digits are significant (10), and the third digit is the multiplier ($10^2$). $10 \times 100 = 1,000$ pF. * **J**: Tolerance code for ±5%. * **O3**: Internal manufacturer variation or specific lead style code. * **SA-R02**: Packaging and compliance markers (often indicating RoHS compliance and tape/reel or bulk specifications). --- ### 3. Key Features & Applications #### Features: * **Low Dissipation Factor:** Mica capacitors have extremely low losses, making them efficient in RF circuits. * **High Stability:** Unlike ceramic capacitors (like Y5V or Z5U), silver mica maintains its capacitance value despite changes in temperature or voltage. * **Voltage Handling:** A 500V rating allows it to be used in tube amplifiers and high-power transmitters. #### Common Applications: 1. **RF Oscillators:** Used in tuning circuits where frequency drift must be minimized. 2. **Filter Networks:** Ideal for high-Q filters due to low ESR (Equivalent Series Resistance). 3. **Audio Equipment:** Frequently used in high-end audio gear and guitar amplifiers for their "transparent" sound profile. 4. **Snubber Circuits:** Used in pulse-handling applications where reliability is critical. --- ### 4. Comparison with Other Dielectrics | Feature | Silver Mica (DM05) | Ceramic (MLCC) | Film (Polyester) | | :--- | :--- | :--- | :--- | | **Precision** | Very High | Moderate | High | | **Temp. Stability** | Excellent | Poor (X7R) / Good (C0G) | Moderate | | **Frequency Range** | Very High | High | Low to Moderate | | **Cost** | Expensive | Cheap | Moderate |