## Overview: MMA02040D3JB0 The **MMA02040D3JB0** is a specific part number for a **Professional MELF (Metal Electrode Leadless Face) Resistor** manufactured by Vishay Beyschlag. MELF resistors are known for their superior reliability, stability, and thermal performance compared to standard thick-film chip resistors. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Series** | MMA 0204 Professional | | **Resistance Value** | 3.3 MΩ (Megaohms) | | **Tolerance** | ± 0.5% | | **Temperature Coefficient (TCR)** | ± 25 ppm/K | | **Power Rating ($P_{70}$)** | 0.4 W | | **Operating Voltage ($U_{max}$)** | 200 V | | **Case Size** | 0204 (DIN size) / 3.6mm length | | **Technology** | Metal Film | --- ### 2. Part Number Breakdown The nomenclature follows the Vishay Beyschlag coding system: 1. **MMA 0204**: The series and physical size (3.6 mm length, 1.4 mm diameter). 2. **0D**: Indicates the Temperature Coefficient (± 25 ppm/K). 3. **3**: The multiplier for the resistance value. 4. **J**: The tolerance code (± 0.5%). 5. **B0**: Packaging code (typically indicates bulk or specific reel type). --- ### 3. Features and Advantages * **MELF Design:** The cylindrical shape provides a larger surface area for heat dissipation compared to flat chip resistors. * **High Reliability:** Excellent stability under different environmental conditions, making them ideal for automotive and industrial sectors. * **Pulse Load Capability:** MELF resistors handle surges and pulses significantly better than standard SMD resistors due to their robust metal film layer. * **Low Noise:** The thin film technology ensures low current noise and low nonlinearity. --- ### 4. Common Applications * **Automotive:** Engine control units (ECU), lighting systems, and safety electronics. * **Industrial:** Power supplies, frequency converters, and measuring equipment. * **Telecommunications:** Base stations and infrastructure hardware. * **Medical:** Diagnostic equipment where high precision and stability are required. --- ### 5. Footprint Information The 0204 MELF size is roughly equivalent to a **1206** SMD footprint in terms of length, but because it is cylindrical, the soldering pads are shaped differently to cradle the component. ```text Physical Dimensions: L (Length): 3.6 mm (+0 / -0.2) D (Diameter): 1.4 mm (+0 / -0.1) ```