TT Electronics adds SMT Kelvin shunt resistors to AEC-Q200-certified range
Surface mount technology (SMT) Kelvin shunt resistors extend the automotive product range available from TT Electronics. The LRMAP4026 metal alloy power resistors offer true four-terminal connection for sub-mOhm current sensing applications, said TT Electronics.
The low resistance metal alloy power resistors are designed for power supply, motor drive and battery monitoring applications. They provide four-terminal Kelvin precision and high current capacity for all industrial applications, including automotive. Four-terminal Kelvin connections improve precision, added TT Electronics, consuming only a small part of the design’s error budget, enabling greater design freedom elsewhere in the circuit. The gullwing design provides spacing from the PCB which minimises the board temperature rise and enhances reliability of the assembly.
“The electron-beam welded SMT shunt LRMAP4026 joins TT’s portfolio of SMT current sense resistors with AEC-Q200 qualification. According to Brian Stephenson, director of engineering at TT Electronics: “This new series helps our customers achieve accurate and stable current measurement, providing resiliency to surges whilst controlling the amount of heat entering the PCB tracks.”
LRMAP4026 offers up to 5W in a 4026 footprint. The resistors are available in seven values from 0.2 to 3.0 mOhm and feature a wide temperature range of -65 to +170 degrees C.
The four-terminal design allows complete separation of current path and voltage sense reducing the difference between unmounted and mounted resistance and TCR values; this is a common problem with two-terminal types, added TT Electronics
The resistors have one per cent tolerance and TCR of 50ppm per degree C, to combine precision with the high surge capacity of metal alloy technology, claimed the company. Its high surge tolerance makes it reliable under inrush and momentary short circuit conditions, TT added.
TT Electronics provides engineered technologies for performance critical applications. It solves electronics challenges for a sustainable world and invests in R&D to create designed-in products where reliability is mission-critical. Products designed and manufactured include sensors, power management and connectivity solutions. TT has design and manufacturing facilities in the UK, North America, Sweden and Asia.
