Diodes Incorporated

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

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The ZXCT21xQ series are automotive AEC-Q qualified high-precision current-shunt monitors with different choices of gain options to measure low-voltage drop (10mV) across a small shunt resistor with minimal error. This enables high accuracy of large current measurement and reduces a power loss caused by the measurement at common-mode voltages from -0.3V to 26V.

OUT pin is a voltage proportional to the load current. It can then be processed with an ADC. There are five fixed gains available: 50, 75, 100, 500, and 1000 V/V respectively. This device is designed with zero-drift architecture and is manufactured by post trim technology to achieve low offset voltage, low gain drift and low gain error among full temperature range for precise measurement.

The ZXCT21xQ operates from a single 2.7V to 26V power supply with a maximum of 100μA of supply current from -40°C to +125°C, and is offered in SOT363 package.


  • Automotive AEC-Q100 Grade 1
  • Supply Voltage Range: 2.7V to 26V
  • Temperature Range: -40°C to +125°C
  • Wide Common-Mode Range: -0.3V to 26V
  • Support Shunt Drops of 10mV Full-Scale
  • Gain Error (Maximum Overtemperature)
    • A and B Version: ±0.8%
    • C Version: ±0.5%
  • Low Offset Voltage: ±30μV (max)
  • Quiescent Current: 100μA (max)
  • Low Gain Error Drift: 10ppm/°C (max)
  • Rail-to-Rail Output Capacity
  • Choice of Gains:

– ZXCT211Q: 500V/V

– ZXCT212Q: 1000V/V

– ZXCT213Q: 50V/V

– ZXCT214Q: 100V/V

– ZXCT215Q: 75V/V

  • Package: 6-pin SOT363
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The ZXCT21xQ are suitable for automotive applications requiring specific change control; these parts are AECQ100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • 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) 100
% Accuracy @ VSENSE =100mV Ta (%) 0.5
Quiescent Current (µA) 65
Bandwidth typ (MHz) 0.03
Operating Ambient Temperature Range (°C) -40-125
Special Features Bi-directional current measurement, very 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.