The part number **CSS075D271** typically refers to a **Current Sensing Resistor** (Shunt Resistor) often produced by manufacturers like SUSUMU or similar precision component brands. These components are designed to measure current by creating a small voltage drop that can be measured by a control circuit. --- ### 1. Technical Specifications Below is a breakdown of the standard specifications for this series of components: | Parameter | Specification | | :--- | :--- | | **Component Type** | Metal Foil Low Resistance Chip Resistor | | **Resistance Value** | 270 mΩ (0.27Ω) | | **Tolerance** | ±0.5% or ±1% (typically) | | **Power Rating** | 0.75 Watts | | **Package Size** | 0805 or similar metric equivalent | | **Temperature Coefficient** | Low TCR (e.g., ±50ppm/°C or ±100ppm/°C) | --- ### 2. Part Number Breakdown The nomenclature is generally structured as follows: * **CSS**: Series identifier (Current Sensing Surface-mount). * **075**: Power rating designation (0.75W). * **D**: Tolerance code (D usually signifies ±0.5%). * **271**: Resistance value code. * *Calculation*: 27 x 10^1 = 270 (mΩ). --- ### 3. Key Features * **Low Inductance:** Designed with a metal foil structure to minimize parasitic inductance, which is critical for high-frequency switching power supplies. * **Thermal Management:** The construction is optimized for heat dissipation to prevent resistance shifts due to self-heating. * **Precision:** High accuracy allows for precise current monitoring in feedback loops. --- ### 4. Common Applications These resistors are commonly found in the following electronic circuits: 1. **Battery Management Systems (BMS):** To monitor charge and discharge currents. 2. **DC-DC Converters:** Used in the feedback path to regulate output current. 3. **Motor Controllers:** To detect over-current conditions and protect the motor. 4. **Power Inverters:** Providing real-time current data to the microprocessor. ---