A surface-mount Power Metal Strip current sense resistor that combines a high power rating up to 6W, TCR down to ± 70ppm/°C, and extremely low resistance values down to 0.0003Ω in the 2512 case size has been announced by Vishay Intertechnology.
Providing a power density of 192W/in^2, the Vishay Dale WSLF2512 allows designers to save board space in high-power circuits by utilising the smallest resistor possible. The device's low TCR provides stable and accurate current measurement across a wide temperature range, while its low resistance values minimise power losses and improve end product efficiency.
The WSLF2512's advanced construction incorporates a solid metal nickel-chrome, manganese-copper, or manganese-copper-tin alloy resistive element with low TCR (< 20ppm/°C). This results in a higher-power resistor in a smaller size that maintains the superior electrical characteristics of the Power Metal Strip construction. A proprietary processing technique produces resistance values ranging from 0.0003 to 0.003Ω, with tolerances of ±1.0% and ±5.0%. The device provides low thermal EMF (< 3μV/°C), very low inductance (< 2nH), and a temperature range from -65 to +170°C.
The resistor released today is suited for all types of current sensing, voltage division, and pulse applications in power management for automotive electronic controls such as engine, transmission, anti-lock brakes, audio, and climate controls; inverter controls for down-hole test and measurement equipment and HVAC systems; and VRMs for servers. The device is RoHS-compliant, halogen-free, and Vishay Green.
Samples and production quantities of the WSLF2512 are available now, with a lead time of six to eight weeks for larger orders.