ON Semiconductor – NCS199Ax and NCS21x Current Sense Amplifiers

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The NCS199Ax and NCS21x devices are voltage output current shunt monitors that measure voltage across shunts at common mode voltages from -0.3V to +26V, independent of supply voltage.

Multiple fixed gains are available: 50V/V, 75V/V, 100V/V, 200V/V, 500V/V, or 1000V/V. The low offset of the zero-draft architecture enables current sensing with maximum drops across the shunt as low as 10mV full-scale. The devices can operate from a single +2.7V to +26V power supply, drawing a maximum of 100μA of supply current. All versions are specified over the extended operating temperature range (-40°C to +125°C).


  • Automotive
  • Computing
  • Networking and telecom
  • Consumer and portable


  • Power monitors
  • Power adapters
  • Feedback control loops
  • Current sensors
  • E-cigarettes
  • Mobile device fast chargers
  • Telecom DC/DC modules

Wide common mode input range -0.3V to 26VHigh side current sensing for high voltage systems
Supply voltage range from 2.7V to 26VFlexible system supply voltage
Low offset voltages of ±60μV, ±100μV, and ±150μV maxLow value current sense resistors for better power efficiency
Low offset driftTemperature sensitive applications
±1% accuracy for NCS21x
1.5% accuracy for NCS199Ax

Part NumberGain (V/V)Gain Error Max (%)VCM(V)IDTyp (mA)GBW Typ (MHz)VIOMax (mV)VIODrift Max (µV/°C)Package Type
NCS210SQT2G200±1-0.3 to 260.0650.04±0.0600.6SC-88-6 / SC-70-6 / SOT-363-6
NCS211SQT2G500±1-0.3 to 260.0650.025±0.0600.6SC-88-6 / SC-70-6 / SOT-363-6
NCS214SQT2G100±1-0.3 to 260.0650.06±0.0600.6SC-88-6 / SC-70-6 / SOT-363-6
NCS199A1SQT2G50±1.5-0.3 to 260.0650.1±0.1502SC-88-6 / SC-70-6 / SOT-363-6
NCS199A2SQT2G100±1.5-0.3 to 260.0650.06±0.1500.6SC-88-6 / SC-70-6 / SOT-363-6
NCS199A3SQT2G200±1.5-0.3 to 260.0650.04±0.1500.6SC-88-6 / SC-70-6 / SOT-363-6