The **OA2AA-R010** is an automotive-grade, high-precision shunt resistor manufactured by **ISABELLENHÜTTE**. It is part of the **OAR series** (Open Air Resistors), specifically designed for current sensing applications where high stability and low resistance are required. --- ### 1. Key Technical Specifications The part number "R010" indicates a resistance value of **10 mΩ (0.010 Ohms)**. | Feature | Specification | | :--- | :--- | | **Resistance Value** | 10 mΩ (0.010 Ω) | | **Power Rating** | 2 Watts (at 70°C) | | **Tolerance** | ±1% (Standard for R010) | | **Temperature Coefficient (TCR)** | < 20 ppm/K | | **Operating Temperature** | -55°C to +175°C | | **Inductance** | < 10 nH (Low Inductance) | --- ### 2. Physical Construction The OA2AA-R010 is an **Open Air Resistor**. Unlike chip resistors, these utilize a formed metal element that stands off the PCB. * **Material:** Built using **MANGANIN®** or **ZERANIN®** (proprietary alloys from Isabellenhütte) which ensures extremely low resistance change over temperature fluctuations. * **Design:** The "U-shape" or bridge design allows for air cooling and prevents heat transfer to the PCB, which is critical in high-current environments. * **Terminals:** Copper leads for excellent weldability and low contact resistance. --- ### 3. Application Areas This component is primarily used for **Current Sensing** (Shunt) in power electronics. * **Automotive Systems:** Battery management systems (BMS), electric power steering (EPS), and engine control units. * **Industrial:** Frequency converters, motor control, and power supplies. * **Consumer:** High-power DC-DC converters and battery chargers. --- ### 4. Why use the OA2AA-R010? 1. **Thermal Stability:** The low TCR (Temperature Coefficient of Resistance) means the resistance value remains accurate even as the component heats up. 2. **Pulse Loading:** Because it is a metal element, it can handle significant current surges better than thin-film or thick-film resistors. 3. **Low Inductance:** The design minimizes parasitic inductance, making it suitable for high-frequency switching applications. ---