The **CMK-R015** is a high-precision, low-resistance **Current Sensing Resistor** (often called a Shunt Resistor). It is primarily used in power management circuits to measure current flow by monitoring the voltage drop across it. --- ### 1. Technical Specifications The part number "R015" typically indicates a resistance value of **15 mΩ (0.015 Ohms)**. Below are the standard technical characteristics for this component: | Parameter | Typical Value | | :--- | :--- | | **Resistance** | 15 mΩ (0.015 Ω) | | **Tolerance** | ±1% (F) or ±5% (J) | | **Power Rating** | 1W to 2W (depending on package size) | | **Temperature Coefficient (TCR)** | ±50ppm/°C to ±100ppm/°C | | **Material** | Metal Alloy / Thick Film | | **Operating Temperature** | -55°C to +155°C | --- ### 2. Physical Construction These resistors are designed to handle high current without significant self-heating or resistance drift. * **Package Type:** Usually a Surface Mount Device (SMD) in sizes like 1206, 2010, or 2512. * **Element:** Uses a robust metal alloy element to ensure stability under thermal stress. * **Terminations:** Large contact areas to minimize "parasitic" resistance at the solder joints. --- ### 3. Functional Application The CMK-R015 operates based on **Ohm’s Law ($V = I \times R$)**. In a circuit, it is placed in series with the load. #### Common Use Cases: 1. **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in Li-ion batteries. 2. **DC-DC Converters:** Providing feedback for over-current protection. 3. **Motor Control:** Detecting the torque and load of a motor by measuring current consumption. 4. **Power Supplies:** Regulating the output current for stable power delivery. --- ### 4. Key Advantages * **Low Inductance:** Ideal for high-frequency switching power supplies. * **High Precision:** The low TCR (Temperature Coefficient) ensures that the resistance doesn't change significantly as the part gets hot. * **Durability:** Metal alloy construction is resistant to mechanical and thermal shock. ---