ON Semiconductor – Precise current-sense amplifiers feature low gain error and offset voltage


The NCV21xR series from ON Semiconductor are automotive voltage-output current-sense amplifiers which can measure voltage across shunt resistors at common-mode voltages ranging from -0.3V to 26V, independent of the supply voltage. The NCV21xR amplifiers are AEC-Q100 qualified for use in automotive systems. ON Semiconductor also supplies the NCS21xR series for use in industrial applications.

Offering a choice of fixed gain values, the NCV21xR and NCS21xR series amplifiers are notable for their low offset voltage and zero-drift architecture. These enable the implementation of accurate and stable current-sensing circuits with maximum full-scale drops across the shunt resistor as low as 10mV.

The NCV21xR amplifiers can operate from a single 2.2V to 26V power supply, compatible with the safe 2.5V voltage reference typically used in a measurement circuit, and can handle an absolute maximum input of 30V. They draw a maximum supply current of 80μA.

ON Semiconductor also supplies the NCS199AxR industrial current-sense amplifiers, which offer the flexibility of operating from a wide supply-voltage range of 2.2V to 26V, and which are rated for an absolute maximum voltage of 30V.


  • 0.5V/°C offset drift
  • 10ppm/°C maximum gain error drift
  • Rail-to-rail output capability


  • Power-supply adaptors
  • Wireless chargers
  • Power supplies for telecoms equipment
  • Hybrid and electric vehicles
  • Automotive systems
Gain (V/V)20050050100
Gain error (%)1111
Offset voltage (μV)353510060


The PCB comes populated with the amplifier, six test points and one 0.1μF capacitor. The user can mount their own custom shunt resistor for quick prototyping.

Orderable Part Number: NCS210RMUTAGEVB