The part number **DM19EE102JO3-ST-R02** refers to a high-precision **Silver Mica Capacitor** typically manufactured by companies like Cornell Dubilier (CDE). These capacitors are renowned for their high stability, low loss, and reliability in RF (Radio Frequency) applications. --- ### 1. Technical Specifications Breakdown The alphanumeric string defines the specific characteristics of the component: | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | DM19 | Standard dipped mica case size (approx. 11.4 x 11.4 mm). | | **Characteristic** | E | Temperature coefficient and drift range (Standard). | | **Capacitance** | 102 | 10 followed by 2 zeros = **1000 pF (1nF)**. | | **Tolerance** | J | **±5%** (Standard precision for mica). | | **Voltage** | O3 | Rated for **500 VDC**. | | **Termination** | ST | Straight leads (Standard). | | **RoHS** | R02 | Compliance with environmental regulations (Lead-free). | --- ### 2. Key Material Properties Silver Mica capacitors are constructed by sandwiching mica (a natural mineral) with silver electrodes. This construction provides unique electronic benefits: * **Low Dissipation Factor:** They exhibit extremely low losses, making them ideal for high-frequency circuits. * **Temperature Stability:** The capacitance changes very little across a wide temperature range (typically -55°C to +125°C). * **High Voltage Handling:** The dielectric strength of mica allows for high voltage ratings in a relatively small physical package. * **Tight Tolerance:** Unlike ceramic disc capacitors, mica capacitors maintain their rated value very accurately over time. --- ### 3. Common Applications Due to their stability and high-Q factor, these parts are found in: 1. **RF Oscillators:** Maintaining frequency stability in radio transmitters. 2. **Filter Networks:** Used in low-pass, high-pass, and band-pass filters where precise cutoff frequencies are required. 3. **Snubber Circuits:** Handling high-speed voltage spikes in power electronics. 4. **Audio Equipment:** Sometimes used in high-end audio for their linear signal reproduction. --- ### 4. Physical Dimensions (Approximate) | Dimension | Value (mm) | Value (inches) | | :--- | :--- | :--- | | **Length (Max)** | 11.4 mm | 0.450" | | **Height (Max)** | 11.4 mm | 0.450" | | **Thickness (Max)** | 4.8 mm | 0.190" | | **Lead Spacing** | 8.7 mm | 0.344" |