The **CRA2010-FZ-R020ELF** is a high-power, low-resistance chip resistor manufactured by **Bourns**. It belongs to the CRA series, which is specifically designed for current sensing applications where precision and heat dissipation are critical. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Bourns | | **Resistance Value** | 20 mΩ (0.020 Ohms) | | **Tolerance** | ±1% (F) | | **Power Rating** | 1 Watt | | **Case Size (Imperial)** | 2010 | | **Temperature Coefficient** | ±100 ppm/°C | | **Technology** | Thick Film | | **Operating Temperature** | -55°C to +155°C | --- ### Key Characteristics #### 1. Current Sensing Capability Because the resistance is extremely low (20 mΩ), this component is used to measure current flow. By measuring the voltage drop across this resistor ($V = I \times R$), a microcontroller or sensing IC can calculate the current ($I$) without significantly affecting the circuit's performance. #### 2. 2010 Package Size The "2010" designation refers to the physical dimensions: * **Length:** 5.00 mm * **Width:** 2.50 mm This larger footprint compared to standard 0805 or 1206 resistors allows it to dissipate **1 Watt** of heat effectively. #### 3. Composition and Build * **Thick Film:** It uses a metal glaze layer on a ceramic substrate. * **RoHS Compliant:** The "LF" suffix indicates it is Lead-Free and environmentally compliant. * **Terminations:** Usually features a matte tin finish over a nickel barrier to prevent leaching during soldering. --- ### Common Applications * **Power Management:** DC-DC converters and battery management systems (BMS). * **Motor Control:** Detecting over-current conditions in small motors. * **Consumer Electronics:** Laptop power adapters and fast-charging circuits. * **Industrial:** Power supply monitoring and load detection. --- ### Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **CRA2010** | Series Name and Package Size (2010) | | **FZ** | Tolerance (F = ±1%) and TCR (Z = ±100 ppm/°C) | | **R020** | Resistance Value (R acts as decimal: 0.020Ω) | | **E** | Embossed Plastic Tape Packaging | | **LF** | Lead-Free (RoHS Compliant) |