The **CRA2010-FZ-R034ELF** is a high-precision, low-resistance chip resistor manufactured by **Bourns**. It is specifically designed as a "Current Sense Resistor" used to measure current flow in electronic circuits by monitoring voltage drops. --- ### 1. Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Resistance** | 0.034 Ohms ($34 \text{ m}\Omega$) | | **Power Rating** | 1.0 Watt | | **Tolerance** | ±1% (F-grade) | | **Package Size** | 2010 (Inches) / 5025 (Metric) | | **Temperature Coefficient** | ±100 ppm/°C | | **Technology** | Metal Strip / Thick Film | | **Terminal Material** | Lead-free (LF) / Tin-plated | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **CRA**: Series prefix for High Power Current Sense Resistors. * **2010**: The physical footprint (approx. 5.0mm x 2.5mm). * **F**: Resistance tolerance (±1%). * **Z**: Temperature Coefficient of Resistance (TCR) code. * **R034**: The resistance value ($0.034 \Omega$). * **E**: Packaging code (typically Embossed Tape). * **LF**: RoHS compliant (Lead-Free). --- ### 3. Key Features and Applications #### Features * **Low Resistance:** Essential for minimizing power loss ($P = I^2R$) while sensing current. * **High Power Dissipation:** The 2010 package allows for 1W of power, which is high for its size. * **Stability:** Designed to maintain accuracy even as temperatures rise during operation. #### Common Applications 1. **Power Management:** Used in DC-DC converters and voltage regulators. 2. **Battery Management Systems (BMS):** To monitor charge and discharge currents in Li-ion packs. 3. **Motor Control:** Sensing current to prevent over-torque or stall conditions. 4. **Overcurrent Protection:** Acting as a sensor for "fuse-like" safety circuits. --- ### 4. Typical Circuit Integration To measure current using this part, it is placed in series with the load. The voltage ($V_{out}$) measured across the resistor is proportional to the current ($I$) according to Ohm’s Law: ```text V = I × 0.034 Example: If 5 Amps flow through the resistor: V = 5A × 0.034Ω = 0.17V (170mV) ```