High power, low value SMT shunt resistor suitable for automotive, medical and industrial applications

The LRMAP3920 is a high power, low value SMT shunt resistor available now from TTI Europe. It has values down to 200µohm and a power rating on FR4 of 5W, the maximum measurable current is over 150A, and in most cases restricted only by the capacity of the PCB tracks. A 10W power rating may be achieved for assemblies on thermal substrates like DBC ceramic or IMS, making this part ideal for power hybrid modules. Low thermal impedance minimises the temperature rise and enhances the reliability of the assembly. High surge tolerance gives reliable product performance under inrush and momentary short circuit conditions. Good long term stability of value, low TCR and low thermal EMF all mean that a small part of the designer’s error budget is consumed, enabling more design freedom elsewhere in the circuit. For circuit designers who need to guarantee stable and accurate sensing of AC and DC currents up to 150A in SMD assemblies TTI Europe say the device matches or exceeds the power ratings of key competitors at most ohmic values.