Diodes Incorporated ZXCT211BDSJ-7

Overview

ZXCT211BDSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 500 V/V fixed gain, ±30 µV max offset voltage, and rail-to-rail output, designed for accurate bidirectional or unidirectional current monitoring across shunt resistors at common-mode voltages up to 26 V in industrial power supplies and battery management systems.

For engineers reviewing the ZXCT211BDSJ-7 datasheet, ZXCT211BDSJ-7 pinout, ZXCT211BDSJ-7 application, or ZXCT211BDSJ-7 equivalent, this device supports low 10 mV full-scale shunt drops, operates from 2.7 V to 26 V supply, delivers ±0.8% max gain error over temperature, and features 10 ppm/°C gain drift - critical for stable current measurement in high-accuracy embedded sensing.

Technical Context

The ZXCT211BDSJ-7 implements a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±30 µV max input offset and 0.1–0.5 µV/°C offset drift across –40°C to +125°C. Its differential input stage accepts common-mode voltages from –0.3 V to 26 V independent of supply voltage, enabling high-side sensing on rails far exceeding V+.

It provides rail-to-rail output swing (within 50 mV of rails) into 10 kΩ loads, supports both unidirectional (REF tied to GND or V+) and bidirectional (REF biased to mid-supply) configurations, and maintains 95 dB min CMRR and ±10 µV/V PSRR over full temperature range.

Key Specifications

Pinout & Package

Package: U-QFN1418-10 (1.4 mm × 1.8 mm, 0.5 mm pitch, wettable flank).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision current sensing applications.

Compared with INA240A1IDR and MAX40056ATA+, the ZXCT211BDSJ-7 uniquely combines –0.3 V to 26 V common-mode range, 100 µA IQ, and ±30 µV offset in a 1.4 mm × 1.8 mm package - making it optimal for space-constrained, low-power, bidirectional sensing where rail compatibility and thermal stability are critical.

Availability

ZXCT211BDSJ-7 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, server VRM monitoring, and high-performance GPU power rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ZXCT211BDSJ-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 ICs, with emphasis on high-reliability, energy-efficient solutions for industrial, computing, and communications markets.

The ZXCT21x series belongs to Diodes' precision analog product line, engineered specifically for high-accuracy current sensing in harsh thermal environments - targeting applications where offset drift, common-mode range, and supply flexibility outweigh raw speed requirements.

FAQ

What is the maximum shunt voltage the ZXCT211BDSJ-7 can accurately measure?

The ZXCT211BDSJ-7 supports full-scale shunt voltage drops as low as 10 mV due to its 500 V/V gain and ±30 µV offset. At 10 mV input, output is 5 V - matching typical ADC reference ranges. It maintains ±0.8% gain accuracy across –40°C to +125°C, enabling precise measurement of currents from milliamps to hundreds of amps depending on shunt value.

Can ZXCT211BDSJ-7 be used for bidirectional current sensing?

Yes. By applying a stable mid-supply voltage (e.g., V+/2) to the REF pin, the OUT pin swings symmetrically above and below that reference, enabling detection of current direction. The device's rail-to-rail output and –0.3 V to 26 V common-mode range allow bidirectional operation even with negative shunt voltages, as verified in BMS applications with charging/discharging cycles.

Does ZXCT211BDSJ-7 require external filtering for EMI immunity?

Input filtering is recommended in noisy environments. The datasheet specifies input resistors ≤10 Ω to avoid gain/CMRR degradation from mismatch, and suggests RC networks (e.g., 10 Ω + 0.01 µF) to dampen shunt inductance-induced transients. No external filter is mandatory for basic operation, but layout best practices - including short traces, ground plane under the U-QFN, and local 100 nF bypass at V+ - are essential for specified performance.

How does the zero-drift architecture improve long-term measurement stability?

The zero-drift chopper-stabilized design actively corrects input offset in real time, reducing long-term drift to <0.5 µV/°C and limiting total offset to ±30 µV over –40°C to +125°C. This eliminates the need for periodic system-level calibration and ensures <0.006% error contribution from offset at 5 mV sense voltage - critical for metering-grade accuracy in unattended industrial equipment.