The part number **DM05EY151JO3-SA-R02** refers to a high-precision **Mica Capacitor**. These components are known for their extreme stability, high reliability, and low loss, making them ideal for RF (Radio Frequency) and high-frequency circuit applications. Below is a detailed breakdown of the electronic specifications and characteristics based on the standard coding for DM series Mica capacitors. ### 1. Technical Specifications | Parameter | Specification | Description | | :--- | :--- | :--- | | **Component Type** | Mica Capacitor | Uses natural mica as the dielectric material. | | **Capacitance Value** | 150 pF (151) | The code "151" translates to 15 x 10^1. | | **Tolerance** | ±5% (J) | "J" denotes a 5% deviation from the nominal value. | | **Voltage Rating** | 500V DC (Standard) | High dielectric strength for voltage spikes. | | **Temperature Range** | -55°C to +125°C | Rated for military and industrial environments. | | **Package/Case** | Radial Lead (DM05) | Small dipped package for through-hole mounting. | --- ### 2. Part Number Deciphering Breaking down the alphanumeric code: * **DM05**: The physical case size and style (Dipped Mica, Size 05). * **EY**: Temperature characteristic/dielectric type (high stability). * **151**: Capacitance value. The first two digits (15) are significant figures; the third (1) is the multiplier (150pF). * **J**: Tolerance code (±5%). * **O3**: Voltage/Internal manufacturer code (often indicates 500V or 300V depending on manufacturer series). * **SA-R02**: Packaging and lead configuration (likely Tape & Reel or specific lead forming). --- ### 3. Key Electronic Characteristics Mica capacitors like this one possess unique electrical properties: * **High Q Factor:** They have extremely low ESR (Equivalent Series Resistance) and low dissipation factors, meaning very little energy is lost as heat. * **Capacitance Stability:** The capacitance value remains remarkably steady across varying temperatures and voltages. It does not suffer from the "Voltage Coefficient" issues found in Class 2 Ceramic capacitors. * **Precision:** Used in circuits where timing, frequency tuning, and filtering must remain exact. * **Longevity:** Mica is chemically inert and does not age significantly, providing a very long operational life. --- ### 4. Common Applications Due to its 150pF value and high stability, this part is typically used in: 1. **RF Oscillators:** To maintain frequency stability. 2. **Tuned Circuits:** In radio transmitters and receivers. 3. **Pulse Power Circuits:** Handling rapid charge/discharge cycles. 4. **Audio Equipment:** High-end audio filtering where signal integrity is paramount. ---