The part number **DM19EC151JO3-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 losses at high frequencies. Below is a detailed breakdown of the electronic specifications and features. --- ## 1. Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Capacitance** | 150 pF | Standard unit of measurement (151 code) | | **Tolerance** | ±5% (J) | The variance from the nominal capacitance | | **Voltage Rating** | 300 VDC | Maximum continuous DC voltage | | **Dielectric Material** | Silver Mica | Provides excellent temperature stability | | **Operating Temp.** | -55°C to +125°C | Suitable for extreme environments | | **Termination** | Radial Leads | Through-hole mounting style | | **Case Type** | DM19 | Standardized mica capacitor case size | --- ## 2. Part Number Breakdown Understanding the alphanumeric code helps in identifying the exact variant: * **DM19**: Represents the physical size and case style (Standard Dipped Mica). * **EC**: Indicates the temperature coefficient and characteristic (Range: -20 to +100 ppm/°C). * **151**: The capacitance code ($15 \times 10^1 = 150$ picofarads). * **J**: The tolerance code ($\pm 5\%$). * **O3**: Indicates the voltage rating (300V). * **SA**: Special variation/internal manufacturing code. * **R02**: RoHS compliance or packaging variant code. --- ## 3. Key Electronic Characteristics ### High Stability Silver Mica capacitors are known for their "zero-drift" characteristics. The capacitance remains remarkably stable even when subjected to temperature fluctuations, making them ideal for precision timing circuits. ### Low Loss (High Q Factor) These parts exhibit extremely low Inductance and Resistance (ESR). Because of this, they are frequently used in RF (Radio Frequency) applications where signal integrity is critical. ### Voltage Endurance Unlike ceramic capacitors, mica capacitors do not suffer from "voltage coefficient of capacitance" (where capacitance drops as DC voltage increases). The 150pF remains 150pF regardless of the applied voltage (within the 300V limit). --- ## 4. Typical Applications * **RF Oscillators:** Used in tuning circuits to maintain frequency stability. * **Filters:** High-Q filters for telecommunications. * **Snubber Circuits:** In high-voltage power supplies to suppress voltage spikes. * **Medical Equipment:** Where long-term reliability and precise values are required.