The **CSS0628F** refers to a specific series of high-power, low-resistance current sense shunt resistors, typically manufactured by companies like **Bourns** or **Susumu**. These components are critical in power management and battery monitoring circuits. --- ### 1. Key Technical Specifications The part number usually encodes specific physical and electrical attributes. Below are the general specifications for the CSS0628 series: | Parameter | Specification | | :--- | :--- | | **Case Size** | 0628 (Metric) / ~2512 (Imperial equivalent) | | **Power Rating** | 4W to 6W (depending on mounting) | | **Resistance Range** | 0.5 mΩ to 5 mΩ (Common range) | | **Tolerance** | ±1% or ±5% | | **TCR** | ±50 PPM/°C to ±150 PPM/°C | | **Operating Temp** | -55°C to +170°C | --- ### 2. Physical Construction The "F" in the suffix usually denotes the tolerance (±1%) or a specific lead-free/RoHS compliant finish. * **Material:** Often constructed from a metal alloy (Manganin or Ni-Cr) to ensure a low Temperature Coefficient of Resistance (TCR). * **Design:** These are "Surface Mount Devices" (SMD) with large copper terminations to handle high current and dissipate heat effectively. * **Physical Dimensions:** Approximately 6.3 mm x 7.0 mm (standard for the 0628 series). --- ### 3. Functional Applications These parts are designed for **Current Sensing**. Because the resistance is extremely low, they can be placed in series with a load without causing a significant voltage drop, while allowing a controller to measure the voltage across the resistor to determine current ($I = V/R$). * **BMS (Battery Management Systems):** Monitoring charge and discharge cycles in EV batteries or power tools. * **Motor Control:** Detecting overcurrent conditions in industrial motors. * **DC-DC Converters:** Providing feedback for power regulation. * **Smart Chargers:** Managing high-speed charging currents. --- ### 4. Implementation Example In a typical circuit, the CSS0628F is placed on the "Low Side" (between the load and ground). ```python # Calculating Voltage Drop across a 1mΩ CSS0628F at 50 Amps resistance = 0.001 # 1 milli-ohm current = 50.0 # 50 Amps voltage_drop = current * resistance power_dissipated = (current**2) * resistance print(f"Voltage Drop: {voltage_drop}V") # 0.05V print(f"Power Waste: {power_dissipated}W") # 2.5W (Within 4W rating) ``` ---