The RSA408X are high-side, current-sense amplifiers with an input voltage range that extends from 5V to 100V making them ideal for telecom, automotive, backplane, and other systems where high-voltage current monitoring is critical. The RSA4080 is designed for unidirectional current-sense applications and the RSA4081 allows bidirectional current sensing. The RSA4081 single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output. The RSA4081 requires an external reference to set the zero-current output level (VSENSE = 0V). The charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND.