The part number **DM19DC151JO3-SA-R02** refers to a high-precision **Mica Capacitor**, typically manufactured by companies like Cornell Dubilier (CDE). These components are renowned for their stability, low loss, and reliability in RF (Radio Frequency) applications. --- ## 1. Technical Specification Breakdown Based on standard nomenclature for the DM series (specifically DM19 size), here is the technical breakdown: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Series** | DM19 | Standard dipped silver mica case size (approx. 11.4 x 11.4 mm). | | **Capacitance** | 150 pF (151) | "151" = 15 followed by 1 zero. | | **Tolerance** | ±5% (J) | "J" denotes a 5% capacitance tolerance. | | **Voltage Rating** | 300V - 500V DC | Usually "D" or "3" codes indicate voltage (standard is 500VDC). | | **Temperature Range** | -55°C to +125°C | Standard operating range for silver mica. | | **Dielectric** | Silver Mica | Provides excellent stability over time and temperature. | --- ## 2. Key Characteristics Silver mica capacitors like the DM19DC151JO3 offer unique electronic properties that distinguish them from ceramic or electrolytic capacitors: * **High Q Factor:** They exhibit very low loss at high frequencies, making them ideal for tuned circuits. * **Temperature Stability:** The capacitance change relative to temperature is very small and predictable. * **Tight Tolerance:** Available in precise values which do not "drift" significantly as the component ages. * **Voltage Withstand:** Excellent dielectric strength allows for high voltage ratings in a relatively small package. --- ## 3. Common Applications Due to their precision and stability, this specific part is commonly used in: 1. **RF Oscillators:** Maintaining a stable frequency in radio transmitters and receivers. 2. **Filter Networks:** Used in high-quality low-pass, high-pass, and band-pass filters. 3. **Snubber Circuits:** Used in low-power pulse applications where high dV/dt (voltage spikes) occur. 4. **Audio Equipment:** Sometimes found in high-end tube amplifiers for signal coupling or tone shaping. --- ## 4. Physical Dimensions (Approximate) The **DM19** case style is a "dipped" radial leaded package: * **Length/Width:** ~11.4 mm x 11.4 mm * **Thickness:** ~4.3 mm to 5.0 mm * **Lead Spacing:** ~8.7 mm (0.344 inches)