## NCSS25-R004TRF: Technical Overview The **NCSS25-R004TRF** is a high-precision, surface-mount **Current Sense Resistor**. It is specifically designed for applications requiring accurate current measurement and power management. --- ### 1. Component Specifications Below are the primary technical parameters for this specific part number: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | NIC Components | | **Resistance Value** | 0.004 $\Omega$ (4 m$\Omega$) | | **Tolerance** | $\pm 1\%$ | | **Power Rating** | 2 Watts | | **Package Size** | 2512 (6432 Metric) | | **Temperature Coefficient (TCR)** | $\pm 100$ ppm/°C | | **Operating Temperature** | -55°C to +155°C | | **Technology** | Metal Foil / Metal Plate | --- ### 2. Key Electronic Features * **Low Resistance Value:** At 4 m$\Omega$, it minimizes power dissipation ($P = I^2R$) while providing a measurable voltage drop for sensing circuits. * **High Power Handling:** The 2W rating in a 2512 package allows it to handle significant current flows without thermal failure. * **Metal Plate Construction:** Unlike standard thick-film resistors, this part uses a solid metal alloy element. This provides superior stability and lower noise. * **Kelvin Connection Capability:** While a 2-terminal device, its large 2512 pads allow for optimized PCB layouts to reduce lead resistance interference. --- ### 3. Functional Application In an electronic circuit, the NCSS25-R004TRF acts as a **shunt**. The typical workflow is as follows: 1. **Current Flow:** The load current passes through the resistor. 2. **Voltage Drop:** A small voltage is generated ($V = I \times 0.004$). 3. **Sensing:** An Operational Amplifier or Current Sense IC monitors this voltage. 4. **Feedback:** The system uses this data for battery management, overcurrent protection, or motor control. --- ### 4. Part Number Breakdown The nomenclature follows NIC Components' standard coding: | Segment | Meaning | | :--- | :--- | | **NCSS** | Metal Foil Current Sensing Resistor Series | | **25** | 2512 Case Size | | **R004** | 0.004 Ohms (4 m$\Omega$) | | **F** | $\pm 1\%$ Tolerance | | **TR** | Tape & Reel Packaging | ---