Diodes Incorporated ZXCT212ADSJ-7

Overview

ZXCT212ADSJ-7 from Diodes Incorporated is a high-precision, zero-drift current-shunt monitor IC with 1000V/V fixed gain, ±30μV max offset voltage, and rail-to-rail output. It measures load current via 10mV full-scale shunt voltage drop across -0.3V to 26V common-mode range while operating from 2.7V–26V supply and consuming ≤100μA quiescent current. It enables accurate high-side/low-side sensing in server power supplies and battery management systems.

For engineers reviewing the ZXCT212ADSJ-7 datasheet, ZXCT212ADSJ-7 pinout, ZXCT212ADSJ-7 application, or ZXCT212ADSJ-7 equivalent, key selection criteria include its 1000V/V gain accuracy (±0.8% over temperature), 10ppm/°C gain drift, -40°C to +125°C operation, U-QFN1418-10 package thermal resistance (R_θJA = 115°C/W), and compatibility with 10mV shunt-based low-power loss designs.

Technical Context

The ZXCT212ADSJ-7 implements a zero-drift chopper-stabilized amplifier architecture with post-trim calibration to achieve ±30μV max input offset and 0.1μV/°C typical offset drift. Its differential input stage supports bidirectional sensing when biased via the REF pin and maintains 100dB min CMRR across -0.3V to 26V common-mode range.

It delivers rail-to-rail output swing (within 50mV of V+ and 5mV of GND) into 10kΩ loads, features 4kHz bandwidth at 1000V/V gain, and sustains stable operation with up to 1nF capacitive load-enabling direct interface with precision ADCs without external buffering.

Key Specifications

Pinout & Package

Package: U-QFN1418-10 (2.0mm × 1.8mm, 0.5mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-gain current monitor applications.

Compared with INA240A1QDRQ1 and MAX40056ATA+T, ZXCT212ADSJ-7 uniquely combines 1000V/V gain, ±30μV offset, and 2.7V–26V supply in a thermally efficient 2×1.8mm package-making it optimal for high-accuracy, wide-input industrial and computing current sensing where space and thermal performance are constrained.

Availability

ZXCT212ADSJ-7 is available at Aetrix Electronics and suitable for server power rail monitoring, battery management systems, industrial PLC analog input modules, and high-performance GPU power delivery requiring stable component supply across extended temperature and voltage ranges.

Supply support for ZXCT212ADSJ-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 ZXCT21x product line targets precision current sensing in high-efficiency power systems, delivering zero-drift performance and wide common-mode operation for industrial, computing, and battery-powered equipment.

FAQ

What is the maximum shunt voltage the ZXCT212ADSJ-7 can accurately measure?

The ZXCT212ADSJ-7 is optimized for 10mV full-scale shunt voltage drops. At its 1000V/V gain, this produces a 10V output-maximizing ADC resolution while minimizing I²R power loss. The device maintains ±0.8% gain error and ±30μV offset across -40°C to +125°C, ensuring <0.3% total error at 10mV. Higher shunt voltages (e.g., 20mV) are supported but reduce relative accuracy due to fixed offset contribution.

Can the ZXCT212ADSJ-7 perform bidirectional current sensing?

Yes-by applying a bias voltage (typically V+/2) to the REF pin, the OUT pin swings above and below that reference to indicate current direction. This enables charge/discharge detection in battery systems. The REF pin must be driven from a low-impedance source (<10Ω) to avoid gain error; internal bias currents require careful PCB layout. Bidirectional operation is validated in the datasheet's Figure 20 and supports ±10mV differential input range.

How does the U-QFN1418-10 package affect thermal performance?

The U-QFN1418-10 package provides R_θJA = 115°C/W (vs. 228°C/W for SOT363), enabling higher continuous current sensing without thermal derating. Its 2.0mm × 1.8mm footprint and exposed thermal pad allow direct connection to PCB copper planes, reducing junction-to-board thermal resistance by ~40%. This supports reliable operation at 100μA quiescent current in compact, high-density power modules where airflow is limited.

Is external filtering required for stable operation with noisy shunt signals?

Input RC filtering is recommended for shunts <1mΩ or in high-dI/dt environments to suppress inductive kick. Use matched resistors ≤10Ω and capacitors sized to match shunt L/R time constant (per datasheet Equation: 2·R_S·C_F ≥ L_SHUNT/R_SHUNT). Exceeding 10Ω introduces gain error (e.g., +0.89% for ZXCT212 with 5Ω series resistors). Bypass capacitors (100nF ceramic at V+) and REF decoupling (10nF) are mandatory for PSRR and CMRR preservation.