The **MMA02040D3JB2** is a high-performance MELF (Metal Electrode Leadless Face) resistor manufactured by **Vishay Beyschlag**. It is part of the MMA 0204 series, known for its professional-grade reliability and stability. --- ### 1. Technical Specifications The part number can be broken down to understand its core electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Series** | MMA 0204 (Professional MELF) | | **Resistance Value** | 3.3 MΩ (Megaohms) | | **Tolerance** | ± 5% (indicated by 'J') | | **Temperature Coefficient** | ± 25 ppm/K (indicated by 'B') | | **Power Rating** | 0.4 W (at 70 °C) | | **Operating Voltage** | 200 V (Maximum) | | **Operating Temp Range** | -55 °C to +155 °C | --- ### 2. Key Features The MELF construction provides several advantages over standard thick-film chip resistors: * **Pulse Stability:** The cylindrical design allows for better heat distribution and superior pulse load capability. * **Precision:** Features a low temperature coefficient, ensuring the resistance remains stable even as the device heats up. * **Reliability:** AEC-Q200 qualified, making it suitable for automotive and industrial environments where vibration and thermal cycling are common. * **Environmental Resistance:** High level of moisture resistance and sulfur resistance (tested according to ASTM B809). --- ### 3. Application Use Cases Due to its high resistance value (3.3 MΩ) and high stability, this component is typically used in: 1. **High Voltage Sensing:** Used in voltage dividers for power supplies. 2. **Automotive Electronics:** Control units for engines, braking systems, and lighting. 3. **Industrial Equipment:** Measurement and calibration tools requiring long-term stability. 4. **Lighting:** Electronic ballasts and LED drivers. --- ### 4. Footprint and Mounting The MMA 0204 follows the standard **DIN 0204** size. * **Form Factor:** Cylindrical (MELF). * **Dimensions:** Approximately 3.6 mm (Length) x 1.4 mm (Diameter). * **Soldering:** Compatible with wave and reflow soldering processes.