The **4A113N-R** is a specific part number typically associated with **current-sense resistors** or high-precision power resistors, often manufactured by companies like *Cyntec* or *Susumu*. These components are essential for monitoring electrical current in high-efficiency power management systems. --- ### Technical Specifications Below is a breakdown of the typical characteristics for a component in this series: | Property | Specification (Typical) | | :--- | :--- | | **Component Type** | Metal Foil Current Sense Resistor | | **Package Code** | 1206 (3216 Metric) | | **Resistance Value** | 1 mΩ to 500 mΩ (Depending on exact sub-code) | | **Tolerance** | ±1% (F) or ±0.5% (D) | | **Power Rating** | 1W to 2W | | **Temperature Coefficient (TCR)** | ±50 ppm/°C to ±100 ppm/°C | | **Operating Temp Range** | -55°C to +155°C | --- ### Key Features * **Low Inductance:** Designed with a flat metal strip construction to minimize parasitic inductance, which is critical for high-frequency switching. * **High Power Density:** Despite the small SMD (Surface Mount Device) footprint, the "N-R" series often utilizes advanced heat dissipation materials to handle high currents. * **Excellent Stability:** The metal foil technology ensures that the resistance remains stable even under thermal stress or long-term load. --- ### Common Applications 1. **DC-DC Converters:** Used in the feedback loop to monitor output current and provide over-current protection. 2. **Battery Management Systems (BMS):** Measuring charge and discharge cycles in smartphones, laptops, and power tools. 3. **Motor Control:** Detecting phase current for precise torque and speed adjustments. 4. **CPU/GPU Power Supplies:** Monitoring high-current rails in computing hardware. --- ### Internal Structure The part usually consists of a **Manganese-Copper** or **Nickel-Chrome** alloy plate welded to copper terminals. This construction ensures a very low resistance path and high mechanical strength compared to standard thick-film resistors.