Diodes Incorporated

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26V, Zero-Drift, Bidirectional, High-Precision Current Monitor

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The ZXCT199Q series are automotive AEC-Q qualified current shunt monitors which are designed to deal with very low sense voltages, enabling the use of very low value sense resistors to monitor large currents. The low offset voltage and zero drift architecture enables current sensing with maximum drops across the shunt to as low as 10mV full-scale.

The ZXCT199Q series have three fixed voltage gain options in 50V/V, 100V/V, and 200V/V. They can measure voltage across shunts at common-mode voltages from -0.1V to 26V, independent of supply voltage.

OUT pin is a voltage proportional to the load current. It can then be processed with an ADC. These devices are designed with zero-drift architecture and manufactured by post trim technology to achieve low offset voltage, low gain drift and low gain error over full temperature range for precise measurement.

These devices operate from a 2.7V to 26V power supply with a maximum supply current of 100μA. All versions have a temperature range of -40°C to +125°C, and are offered in the SOT363 package.

The ZXCT199Q has been qualified to AEC-Q100 Grade 1 and is automotive grade supporting PPAPs.


  • Supply Voltage Range: 2.7V to 26V
  • Wide Common-Mode Range: -0.1V to 26V
  • Gain Error: (Maximum over Temperature Range)
    • A and B Versions: ±1.0%
    • C Version: ±0.8%
  • Choices of Gains:
    • ZXCT 199QX1: 50V/V
    • ZXCT 199QX2: 100V/V
    • ZXCT 199QX3: 200V/V
  • Low Offset Voltage
    • A Version max ±150μV
    • B Version max ±100μV
    • C Version max ±80μV
  • Zero-Drift Performance: 0.5μV/°C (max)
  • Rail-to-Rail Output Capability
  • Low Quiescent Current: 100μA (max)
  • Package: 6-Pin SOT363
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The ZXCT199Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/


The ZXCT199Q is well suited for power supplies running at large current flow requiring the use of low-value sense resistors.

  • Vehicle valve controls
  • Vehicle body control systems
  • Vehicle motor controls, e-pumps
  • Vehicle e-compressors
  • Vehicle ADAS
  • EV OBC, BMS, ESP, high voltage DC/DC
  • Wireless charging
  • Current sensing (high-side/low-side)
  • Battery charging and discharging

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Automotive
AEC Qualified Yes
Type Voltage output
Minimum S+ Common-Mode Sense Voltage (V) -0.1
Maximum S+ Common-Mode Sense Voltage (V) 26
Minimum VCC/VB Supply Voltage (V) 2.7
Maximum VCC/VB Supply Voltage (V) 26
Maximum Output Voltage (V) (V+) + 0.3
Voltage output Gain VOUT/VSENSE (V/V) 50, 100, 200
% Accuracy @ VSENSE =100mV Ta (%) 0.8
Quiescent Current (µA) 65
Bandwidth typ (MHz) 0.014 to 0.07
Operating Ambient Temperature Range (°C) -40 to 125
Special Features Bi-directional current measurement, low input offset voltage

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Diodes Incorporated's current monitors are high-performance, high-side/power rail current measurement ICs. They greatly simplify the measurement of load currents without disturbing the ground plane/reference point.

The current monitor families contain variants with quiescent currents as low as 3µA, and others with operating voltages up to 60V, proving solutions for overcurrent detection in consumer, industrial, and automotive applications. The portfolio includes current output variants which via an external resistor to ground to provide adjustable gain, and voltage output variants with fixed gains.

Automotive-compliant variants are available which are qualified to AEC-Q100 Grade 1 in IATF 16949 facilities supporting PPAP documentation.