Diodes Incorporated ZXCT211BDW-7

Overview

ZXCT211BDW-7 from Diodes Incorporated is a zero-drift, high-precision current-shunt monitor IC with 500 V/V fixed gain, ±30 µV max offset voltage, and −0.3 V to 26 V common-mode input range. It measures load current via shunt resistor voltage drop as low as 10 mV full-scale, enabling accurate high-current sensing in industrial power supplies and battery management systems while operating from 2.7 V to 26 V supply.

For engineers reviewing the ZXCT211BDW-7 datasheet, ZXCT211BDW-7 pinout, ZXCT211BDW-7 application, or ZXCT211BDW-7 equivalent, key selection criteria include its rail-to-rail output swing, 10 ppm/°C gain drift, 100 µA max quiescent current, and SOT363 package compatibility with high-density PCB layouts for server and telecom current monitoring.

Technical Context

The ZXCT211BDW-7 employs a zero-drift chopper-stabilized amplifier architecture to achieve ±30 µV max input offset voltage and 0.1–0.5 µV/°C offset drift over −40°C to +125°C. Its differential input stage supports bidirectional or unidirectional sensing by biasing the REF pin to set output mid-point.

It delivers 500 V/V gain with ±0.8% max gain error over temperature and maintains 100 dB min CMRR across its −0.3 V to 26 V common-mode range. The rail-to-rail output drives 10 kΩ loads with (V+) − 0.2 V high-side and GND + 0.05 V low-side swing at full temperature range.

Key Specifications

Pinout & Package

SOT363 (6-pin) package with 1.3 mm × 2.1 mm footprint, 0.95 mm height, and thermal resistance R_θJA = 228 °C/W. Designed for reflow soldering and high-reliability industrial mounting.

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+T, ZXCT211BDW-7 uniquely balances 26 V common-mode tolerance, 500 V/V gain, ±30 µV offset, and 100 µA IQ in a 2.1 mm × 1.3 mm SOT363 package-making it optimal for space-constrained, wide-input industrial and telecom current monitors requiring minimal self-heating.

Availability

ZXCT211BDW-7 is available at Aetrix Electronics and suitable for server power rail monitoring, industrial PLC current feedback, battery management systems, and telecom rectifier module sensing requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for ZXCT211BDW-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, and communications markets.

The ZXCT21x series is part of Diodes' precision analog portfolio, engineered specifically for high-accuracy, low-power current sensing in harsh environments-from −40°C to +125°C-with emphasis on minimizing shunt power loss and simplifying high-common-mode design.

FAQ

What is the maximum common-mode voltage the ZXCT211BDW-7 can handle?

The ZXCT211BDW-7 supports a common-mode input voltage range of −0.3 V to +26 V, verified per Absolute Maximum Ratings and Recommended Operating Conditions in DS45449 Rev. 3–2. This allows direct high-side sensing on 24 V industrial buses without external level-shifting circuitry, and accommodates negative transients down to −0.3 V relative to GND.

Can the ZXCT211BDW-7 be used for bidirectional current sensing?

Yes-by applying a stable bias voltage (e.g., V+/2 or system reference) to the REF pin, the OUT pin swings symmetrically around that reference, enabling measurement of both charging and discharging currents. The device's rail-to-rail output and low offset ensure accurate zero-crossing detection, as confirmed in the Bidirectional Current-Sensing Circuit (Figure 20) of the datasheet.

What is the typical bandwidth and slew rate of the ZXCT211BDW-7?

The ZXCT211BDW-7 has a small-signal bandwidth of 7 kHz (at C_LOAD = 10 pF) and a slew rate of 0.4 V/µs. These values are measured and specified in the Electrical Characteristics table (page 4 of DS45449), supporting accurate tracking of current transients up to ~1 kHz with minimal phase lag in power supply and motor control feedback loops.

Does the ZXCT211BDW-7 require external passive components for stable operation?

Yes-a minimum 100 nF ceramic bypass capacitor between V+ and GND, placed within 2 mm of the pins, is mandatory for stability and PSRR performance. Input filtering resistors must be ≤10 Ω to avoid degrading CMRR and gain accuracy, and decoupling capacitors are recommended to suppress supply noise, as detailed in Application Information (pages 8–9 of DS45449).