Power resistors provide resilience to surges

21st February 2022
Mick Elliott

Low resistance metal alloy power resistors designed for power supply, motor drive, and battery monitoring applications have been unveiled by TT Electronics.

The LRMAP4026 series provides four-terminal Kelvin precision and high current capacity to all industrial applications, including automotive.

Because four-terminal Kelvin connections improve precision, only a small portion of a design’s error budget is consumed, 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 is the latest addition to TT’s growing portfolio of SMT current sense resistors with AEC-Q200 qualification,” said Brian Stephenson, Director of Engineering, 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.

Available in seven values from 0.2 to 3mΩ, these resistors give designers a high degree of flexibility in a rugged component, featuring a wide temperature range of -65 to +170°C suitable for demanding applications.

The four-terminal design allows complete separation of current path and voltage sense – reducing the difference between unmounted and mounted resistance and TCR values, a common problem with two-terminal types.  

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