Si850x/1x products are ideal upgrades for older current-sensing technologies offering size, performance and cost advantages over current transformers, Hall effect devices, DCR circuits and other approaches. With its 4x4 mm footprint and 1 mm height, the Si85xx is among the smallest current sensors available.

The Si850x/1x  products are extremely low loss, adding less than 1.3 mΩ of series resistance and less than 2 nH series inductance in the sensing path at 25 ºC. Current-sensing terminals are isolated from the other package pins to a maximum voltage of 1,000 VDC. The Si850x/1x AC current sensor family of products mimics the functionality of a traditional current transformer (CT) circuit with burden resistor, diode and output filter but offers enhanced performance and added capabilities. These devices use inductive current sensing and onboard signal conditioning electronics to generate a 2 V full-scale output signal proportional to the ac current flowing from the IIN to the IOUT terminals.

The Si85xx Evaluation Board demonstrates the Si8512 AC Current Sensor. The kit, available for $19.95, includes an assembled and tested evaluation board and documentation.