The **RL1005-2-R075J** is a surface-mount (SMD) low-resistance thick film chip resistor, specifically designed for current sensing applications. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the technical specifications: | Component Segment | Description | Value/Meaning | | :--- | :--- | :--- | | **RL** | Series Name | Low resistance chip resistor (current sense) | | **1005** | Case Size (Metric) | 1.0mm x 0.5mm (0402 in Imperial units) | | **2** | Power Rating | Code for 1/16 Watt (0.063W) | | **R075** | Resistance Value | 0.075 Ohms (75 mΩ) | | **J** | Tolerance | ±5% | --- ### 2. Technical Specifications This component is typically used to monitor current flow by measuring the voltage drop across it. * **Resistance:** 75 mΩ (Milliohms). * **Power Rating:** 0.0625W (1/16W). * **Tolerance:** ±5% (standard J-class tolerance). * **Temperature Coefficient (TCR):** Usually ranges between ±200 to ±600 ppm/°C depending on the specific manufacturer (commonly Cyntec or Susumu). * **Operating Temperature:** Typically -55°C to +125°C or +155°C. --- ### 3. Key Applications Because of its very low resistance, this part is not used for standard signal limiting, but rather for: 1. **Current Sensing:** Placed in series with a load to convert current into a small measurable voltage for ICs. 2. **Battery Management:** Used in mobile devices (due to the small 0402 size) to monitor charge/discharge cycles. 3. **DC-DC Converters:** Providing feedback loops for power supply regulation. 4. **Overcurrent Protection:** Detecting spikes in current to trigger safety shutdowns. --- ### 4. Physical Dimensions (0402 / 1005) | Dimension | Millimeters (mm) | | :--- | :--- | | Length (L) | 1.00 ± 0.05 | | Width (W) | 0.50 ± 0.05 | | Thickness (T) | 0.35 ± 0.05 |