The **LOR3E-R150-K** belongs to a specific category of surface-mount electronic components, typically identifying as a **Current Sense Resistor**. These components are critical for power management, battery monitoring, and feedback loops in electronic circuits. --- ### 1. Technical Specifications Below is a breakdown of the key parameters associated with this part number: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Component Type** | Current Sense Resistor | Used to measure current flow by monitoring voltage drop. | | **Resistance Value** | 150 mΩ (0.150 Ω) | The "R150" in the part number denotes 150 milliohms. | | **Tolerance** | ±10% (K) | The "K" suffix indicates a resistance tolerance of 10%. | | **Technology** | Metal Plate / Thick Film | Designed for high reliability and low thermal EMF. | | **Package / Case** | SMD (Surface Mount) | Typical for modern PCB assembly. | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying equivalent parts: * **LOR3E**: Usually refers to the series and physical size (e.g., a specific wide-terminal or high-power 2512-type footprint). * **R150**: Represents the ohmic value. The "R" acts as the decimal point (0.150 Ohms). * **K**: Represents the tolerance code (K = 10%, J = 5%, F = 1%). --- ### 3. Functional Applications Current sense resistors like the LOR3E-R150-K are used in the following scenarios: 1. **Overcurrent Protection:** Detecting if a motor or power supply is drawing too much current to trigger a shutdown. 2. **Battery Management Systems (BMS):** Monitoring the charge and discharge rates of Lithium-ion cells. 3. **DC-DC Converters:** Providing feedback to the controller to regulate output voltage and current. 4. **LED Drivers:** Ensuring a constant current is supplied to high-power LEDs. --- ### 4. Typical Measurement Circuit To use this part, it is placed in series with the load. The voltage ($V$) measured across it allows the calculation of current ($I$) using Ohm's Law: ```text Formula: I = V / R Where: R = 0.150 Ohms V = Voltage measured across the resistor ``` ---