The part number **DM05FE151JO3-SA-R02** refers to a high-precision **Mica Capacitor** typically manufactured by CDE (Cornell Dubilier). These capacitors are renowned for their stability, high reliability, and low loss at high frequencies. ### 1. Part Number Breakdown | Component Segment | Meaning | Detail | | :--- | :--- | :--- | | **DM05** | Case Size / Series | Standard miniature dipped mica case style. | | **FE** | Voltage Rating | Indicates 500V DC. | | **151** | Capacitance Code | 150 pF (15 + one zero). | | **J** | Tolerance | ±5% (Standard tolerance). | | **O3** | Operating Temp | -55°C to +125°C. | | **SA** | Mounting / Lead | Straight leads / Specific lead spacing. | | **R02** | Packaging/Custom | Indicates RoHS compliance and specific reel/bulk packaging. | --- ### 2. Key Technical Specifications Mica capacitors use silver electrodes screened onto mica sheets as the dielectric. This construction provides specific electronic advantages: * **Capacitance:** 150 pF (Picofarads). * **Voltage Rating:** 500 VDC. * **Tolerance:** ±5%. * **Temperature Coefficient:** Extremely low and predictable, making them ideal for timing circuits. * **Dielectric Absorption:** Very low, allowing for rapid charging/discharging with minimal energy retention. --- ### 3. Electronic Applications Because of their precision and stability, the **DM05FE151JO3-SA-R02** is commonly used in the following areas: 1. **RF Circuits:** Used in oscillators and filters due to the low dissipation factor and high Q (quality) factor at radio frequencies. 2. **High-Voltage Couplings:** With a 500V rating, it can handle significant voltage spikes in power supplies or signal lines. 3. **Timing & Tuning:** Preferred for resonant circuits where the capacitance must remain constant despite temperature fluctuations. 4. **Military & Aerospace:** Mica is chemically stable and resistant to radiation and mechanical shock. --- ### 4. Comparison with Other Dielectrics | Feature | Mica (DM05) | Ceramic (MLCC) | Film Capacitor | | :--- | :--- | :--- | :--- | | **Stability** | Excellent | Varies (X7R shifts) | Good | | **High Frequency** | Outstanding | Good | Moderate | | **Size** | Larger | Very Small | Moderate | | **Cost** | Higher | Very Low | Moderate | ---