SMT-R039-1.0 – Isabellenhütte GMBH

The SMT-R039-1.0, manufactured by ISABELLENHÜTTE GMBH, is a four-terminal ISA-PLAN shunt resistor designed for surface mount applications. This component features a resistance value of 0.039 ohms, achieved through a precision electron beam welded construction using a proprietary alloy resistance material, likely Manganin or Zeranin, to ensure a low temperature coefficient of resistance (TCR) and high long-term stability. The four-terminal Kelvin connection allows for accurate current measurement by separating the current carrying and voltage sensing paths, minimizing the impact of lead resistance on the measurement accuracy. The shunt is designed to handle significant continuous current, the specific value of which is dependent on the PCB layout and thermal management. The SMT package facilitates automated assembly and reflow soldering processes, making it suitable for high-volume production environments.