The **MMA02040C3JB7** is a high-performance **MELF (Metal Electrode Leadless Face)** resistor manufactured by Vishay Beyschlag. It is widely recognized for its reliability, stability, and precision in demanding electronic environments. --- ### 1. Technical Specifications The following table summarizes the core electrical and physical parameters of the device: | Feature | Specification | | :--- | :--- | | **Series** | MMA 0204 - Professional | | **Resistance Value** | Dependent on specific digits (usually part of a range) | | **Resistance Tolerance** | ± 5% (indicated by 'J') | | **Temperature Coefficient** | ± 50 ppm/K (indicated by 'B') | | **Power Rating ($P_{70}$)** | 0.4 W (400 mW) | | **Operating Voltage** | 200 V | | **Operating Temperature** | -55 °C to +155 °C | | **Case Size** | 0204 (Mini-MELF) | --- ### 2. Key Features and Benefits Compared to standard thick-film SMD resistors, the MMA02040C3JB7 offers several distinct advantages: * **Advanced Metal Film Technology:** Provides superior pulse load capability and long-term stability. * **MELF Construction:** The cylindrical shape allows for better heat dissipation and mechanical robustness against board bending or thermal cycling. * **Sulfur Resistance:** Excellent resistance to harsh environments where sulfur contamination might cause failure in standard components. * **Low Noise:** High-quality thin-film materials ensure low current noise and high linearity. --- ### 3. Part Number Breakdown The nomenclature follows the standard Vishay coding system: 1. **MMA 0204**: Defines the series and the physical size (3.6 mm length, 1.4 mm diameter). 2. **0C**: Refers to the TCR (Temperature Coefficient) and standard characteristics. 3. **3**: A placeholder or multiplier digit for the resistance value. 4. **J**: Tolerance code (± 5%). 5. **B7**: Packaging code (typically 7-inch reel or specific bulk quantity). --- ### 4. Typical Applications Due to its reliability, this component is commonly found in: * **Automotive Electronics:** Engine control units (ECUs), lighting systems, and safety sensors. * **Industrial Power:** Power supplies, frequency converters, and measuring equipment. * **Telecommunications:** Base stations and infrastructure hardware. * **Medical Equipment:** Monitoring devices requiring high stability over time.