The **RLW2012-4-R150F** is a high-precision, low-resistance current sensing chip resistor manufactured by **Susumu**. It belongs to the **RLW series**, which is known for its wide terminal design (long-side electrodes) to enhance power dissipation and reliability. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Manufacturer** | Susumu | | **Series** | RLW (Wide terminal type) | | **Resistance Value** | 0.150 $\Omega$ (150 m$\Omega$) | | **Tolerance** | ±1% (F) | | **Power Rating** | 0.5W (1/2 Watt) | | **Case Size (Metric)** | 2012 (2.0mm x 1.25mm) | | **Case Size (Imperial)** | 0805 (Equivalent dimensions, but wide terminal) | | **Temperature Coefficient** | ±100 ppm/°C | --- ### 2. Detailed Part Number Breakdown To understand exactly what each character represents, here is the decoding of the part number: * **RLW**: Series name (Current sensing chip resistors, wide terminal). * **2012**: Physical size (2.0mm length × 1.25mm width). * **4**: Indicates the power rating (0.5W in this specific series configuration). * **R150**: The resistance value. "R" acts as the decimal point (0.150 Ohms). * **F**: The resistance tolerance (±1%). --- ### 3. Features and Advantages * **Wide Terminal Construction:** Unlike standard resistors where the electrodes are on the short sides, the RLW series has electrodes on the **long sides**. This provides a shorter path for heat to travel to the PCB, allowing for higher power ratings in a smaller footprint. * **Low Inductance:** The wide terminal design significantly reduces parasitic inductance, making it ideal for high-frequency switching applications. * **Precision Sensing:** With a low TCR (Temperature Coefficient of Resistance), the resistance remains stable even as the component heats up. * **AEC-Q200 Compliant:** These parts are often used in automotive environments due to their robust thermal cycling performance. --- ### 4. Common Applications These resistors are primarily used for **Current Sensing** (Shunt resistors) in the following circuits: 1. **DC-DC Converters:** Monitoring output current for feedback loops. 2. **Battery Management Systems (BMS):** Measuring charge/discharge cycles. 3. **Motor Control:** Detecting over-current conditions. 4. **Power Inverters:** Used in automotive and industrial power modules. ---