Metal Strip Current-Sense Shunt Resistors – CSI Series

Bourns’ CSI series shunt resistors feature a low temperature coefficient of resistance (TCR) for operating accuracy over wide temperature ranges and excellent long-term stability. The resistors are manufactured using electron beam welded (EBW) resistive material and copper alloy and are available in both two and four-terminal options. The two-terminal models are offered in three footprint sizes: 5930, 3920, and 2512. The four-terminal devices allow precise four-wire Kelvin (K) resistance measurement.

The CSI series’ metal alloy current sensing element allows for low thermal electromotive force (EMF) and low TCRs of ±50 PPM/°C in the +20°C to +60°C temperature range. Both series options supply resistance values as low as 0.2 milliohms, and customers can select from a range of low resistance options and power ratings of up to 15 watts. Very low resistance levels, low thermal EMF, and high power handling capabilities make them ideal solutions for various industrial and consumer applications and power electronics including battery management systems (BMS), switched-mode power supplies (SMPS), and motor drives. While maintaining the same physical and electrical specifications as the CSS series (AEC-Q200-compliant), the CSI series is targeted towards industrial applications. The reduction in regulatory testing and notification processes allows Bourns to offer the CSI series at a more competitive price point.