The **LCRS50-R47JB** is a specific part number typically associated with a **surface-mount (SMD) power resistor**. Based on standard component nomenclature (often used by manufacturers like Walsin or similar electronic component giants), here is the detailed breakdown of its electronic specifications. ### 1. Part Number Deciphering To understand the part, we can break down the alphanumeric code: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **LCRS** | Series Code | Low Ohmic Chip Resistor (Current Sensing) | | **50** | Case Size | 2010 Imperial (approx. 5.0mm x 2.5mm) | | **-** | Separator | Standard Divider | | **R47** | Resistance Value | 0.47 Ohms ($\Omega$) | | **J** | Tolerance | $\pm 5\%$ | | **B** | Packaging | Bulk or Specific Carrier Taping (usually Plastic/Embossed) | --- ### 2. Technical Specifications This component is designed primarily for **current sensing** applications where low resistance and high power handling are required. | Parameter | Value / Description | | :--- | :--- | | **Resistance** | 470 m$\Omega$ (0.47 $\Omega$) | | **Tolerance** | $\pm 5\%$ | | **Power Rating** | Typically 0.75W to 1W (subject to 2010 package limits) | | **Temperature Coefficient (TCR)** | Usually $\pm 100$ to $\pm 200$ ppm/°C | | **Operating Temperature** | -55°C to +155°C | | **Technology** | Thick Film on Ceramic Substrate | --- ### 3. Key Applications Because of its low resistance value ($< 1 \Omega$), the LCRS50-R47JB is not used for standard voltage dropping, but rather for: * **Current Sensing:** Measuring the voltage drop across the resistor to determine the current flowing through a circuit ($I = V/R$). * **Power Management:** Used in DC-DC converters and battery management systems (BMS). * **Motor Control:** Monitoring motor phase currents. * **Over-current Protection:** Sensing when current exceeds a safe threshold to trigger a shutdown. --- ### 4. Physical Dimensions (2010 Package) The "50" in the part number refers to the metric length (5.0mm). * **Length (L):** 5.00 mm $\pm$ 0.20 mm * **Width (W):** 2.50 mm $\pm$ 0.20 mm * **Thickness (T):** 0.60 mm $\pm$ 0.10 mm --- ### 5. Selection Considerations When using the LCRS50-R47JB in a design, ensure: 1. **Power Dissipation:** Calculate $P = I^2 \times R$. Ensure the actual wattage is well below the rated wattage (0.75W - 1W) to prevent overheating. 2. **Solder Pad Layout:** Ensure the PCB footprint matches the 2010 (5025 Metric) specifications. 3. **Inductance:** Being a thick-film resistor, it has low parasitic inductance, making it suitable for high-frequency switching power supplies.