Diodes Incorporated ZXCT199A2DW-7

Overview

ZXCT199A2DW-7 from Diodes Incorporated is a zero-drift, bidirectional current shunt monitor IC designed for high-precision sensing across low-value shunt resistors in high-current systems. It delivers 100 V/V fixed gain, ±100 µV max input offset voltage (–40°C to +125°C), rail-to-rail output swing, and operates from 2.7 V to 26 V supply with 100 µA max quiescent current. Used in server power rails and industrial motor controllers where sub-10 mV sense voltage accuracy is required.

For engineers reviewing the ZXCT199A2DW-7 datasheet, ZXCT199A2DW-7 pinout, ZXCT199A2DW-7 application, or ZXCT199A2DW-7 equivalent, this page provides verified functional context, validated pin-level circuit roles, confirmed bidirectional sensing behavior, and real-world design implications of its –0.1 V to 26 V common-mode range and zero-drift architecture.

Technical Context

The ZXCT199A2DW-7 implements a precision difference amplifier topology with chopper-stabilized zero-drift core, enabling stable offset performance (≤0.5 µV/°C) over –40°C to +125°C. Its input stage accepts differential voltages up to ±26 V while operating from as low as 2.7 V supply - decoupling measurement capability from system rail constraints.

It supports both unidirectional (REF = GND) and bidirectional (REF = mid-supply) current sensing via externally set reference voltage. The 100 V/V gain version achieves 100 dB typical CMRR and 70 kHz bandwidth at 10 pF load, with rail-to-rail output capable of sourcing/sinking ≥10 mA into 10 kΩ loads.

Key Specifications

Pinout & Package

Package: SOT363 (6-pin, 2.1 mm × 2.0 mm × 1.0 mm, 0.95 mm pitch), lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current sensing applications.

Compared with INA240A1IDR and MAX4080TASA+, ZXCT199A2DW-7 uniquely balances 26 V common-mode tolerance, rail-to-rail output, and ±100 µV offset within a 2.7–26 V supply range - making it optimal for server, telecom, and industrial power systems requiring direct high-side sensing without auxiliary circuitry.

Availability

ZXCT199A2DW-7 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, and telecom rectifier modules requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for ZXCT199A2DW-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The ZXCT199 series belongs to Diodes' precision analog portfolio, engineered specifically for high-accuracy, low-loss current monitoring in high-current computing, industrial, and telecom infrastructure.

FAQ

What is the maximum common-mode voltage the ZXCT199A2DW-7 can handle?

The ZXCT199A2DW-7 supports a common-mode input range of –0.1 V to 26 V, independent of supply voltage. This means it can accurately measure shunt voltage even when the shunt's potential exceeds the device's V+ supply - for example, monitoring a 12 V bus while powered from 5 V. Absolute maximum rating is 26 V on IN+ and IN− pins.

How does the REF pin enable bidirectional current sensing?

When the REF pin is biased to a non-zero voltage (e.g., 2.5 V), the output centers at that voltage for zero differential input. Positive shunt voltage (IN+ > IN−) raises output above REF; negative shunt voltage lowers output below REF. This allows single-supply systems to detect both charging and discharging currents without polarity reversal.

Can ZXCT199A2DW-7 be used with a 3.3 V microcontroller ADC?

Yes - its rail-to-rail output (GND + 0.05 V to V+ – 0.2 V) and 100 V/V gain produce 0–3.3 V output with a 33 mV full-scale shunt drop. With V+ = 3.3 V and REF = 1.65 V, it delivers symmetric ±1.65 V output for bidirectional sensing compatible with differential ADC inputs.

Is external filtering required on the IN+ and IN− pins?

Not inherently, but recommended in high-dI/dt environments. If added, source resistors must be ≤10 Ω to avoid degrading CMRR and gain accuracy. A matched RC filter (e.g., 10 Ω + 100 pF) suppresses RF noise without introducing measurable gain error per datasheet Equation 1.