Diodes Incorporated

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26V, Zero-Drift, High Precision Current Monitor

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The ZXCT199 series of current shunt monitors 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 ZXCT199 series has three fixed voltage gain options in 50V/V, 100V/V, and 200V/V. It can measure voltage across shunts at common-mode voltages from -0.1V to 26V, independent of supply voltage.

These parts 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.


  • Supply Voltage Range: 2.7V to 26V
  • Wide Common-Mode Range: -0.1V to 26V
  • Gain Error: (Maximum Overtemperature)
  • A and B version: ±1.0%
  • C version: ±0.8%
  • Choice of Gains:
  • ZXCT 199X1: 50V/V
  • ZXCT 199X2: 100V/V
  • ZXCT 199X3: 200V/V
  • Low Offset Voltage
  • A version max ±150μV
  • B version max ±100μV
  • C version max ±80μV
  • Zero-Drift Performance: 0.5uV/°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)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


The ZXCT199 is well suited for power supplies running at very large currents requiring the use of low-value sense resistors.

  • High-side/low-side current sensing
  • Large-scale computing
  • Computer racks
  • Server farms
  • High-performance video cards
  • Industrial devices
  • Power management devices
  • Instrumentation applications
  • Control systems
  • Metering devices

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
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

Related Content


Technical Documents

Application Notes

Spice Models

Recommended Soldering Techniques


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.