Diodes Incorporated ZXCT211CDW-7

Overview

ZXCT211CDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 500V/V fixed gain, ±0.5% max gain error over temperature, ±30μV max input offset voltage, and rail-to-rail output swing - designed for accurate bidirectional or unidirectional current monitoring in high-common-mode-voltage systems up to 26V, such as battery management and industrial power supplies.

For engineers reviewing the ZXCT211CDW-7 datasheet, ZXCT211CDW-7 pinout, ZXCT211CDW-7 application, or ZXCT211CDW-7 equivalent, this device supports low-shunt-drop (10mV FS) sensing, operates from 2.7V to 26V supply, delivers 7kHz bandwidth, and maintains 10ppm/°C max gain drift across –40°C to +125°C - critical for stable ADC interfacing in embedded power monitoring.

Technical Context

The ZXCT211CDW-7 implements a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ultra-low offset drift (0.1–0.5μV/°C) and high CMRR (≥95dB) across its –0.3V to 26V common-mode input range. Its differential input stage rejects supply noise with ±10μV/V PSRR and supports both high-side and low-side shunt configurations without external level shifting.

It features a single-supply rail-to-rail output capable of sourcing/sinking ±1mA while maintaining <0.05V headroom to rails, and integrates internal bias circuitry that enables REF-pin programmable output centering for bidirectional current sensing - essential for BMS charge/discharge detection with minimal external components.

Key Specifications

Pinout & Package

ZXCT211CDW-7 is housed in a 6-pin SOT363 package (2.1mm × 2.0mm × 1.0mm, 0.95mm pitch), optimized for space-constrained PCB layouts in power modules and compact battery packs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, ZXCT211CDW-7 uniquely combines 26V common-mode tolerance, 500V/V fixed gain, ±30μV offset, and SOT363 compactness - making it optimal for space-constrained, wide-input industrial and computing power rails without automotive or ultra-high-speed requirements.

Availability

ZXCT211CDW-7 is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, server rack PDUs, and high-performance GPU power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ZXCT211CDW-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, with emphasis on power management, signal integrity, and precision sensing for industrial, computing, and consumer markets.

ZXCT21x belongs to Diodes' precision analog sensing product line, engineered specifically for high-accuracy, low-power current monitoring in high-common-mode-voltage environments - targeting applications where shunt-based measurement must coexist with tight thermal budgets and extended temperature operation.

FAQ

What is the maximum common-mode voltage the ZXCT211CDW-7 can handle?

The ZXCT211CDW-7 supports a common-mode input voltage range of –0.3V to 26V, enabling direct connection to 24V battery terminals or 26V industrial bus rails without external attenuation or level-shifting circuitry. This rating is guaranteed across the full operating temperature range (–40°C to +125°C) and applies independently of the 2.7V–26V supply voltage.

Can ZXCT211CDW-7 measure bidirectional current, and how is it configured?

Yes - bidirectional measurement is enabled by applying a bias voltage (typically V+/2 or system reference) to the REF pin, causing the OUT pin to swing symmetrically above and below that reference. The device's rail-to-rail output and zero-drift architecture ensure linear response for both charge and discharge currents, as validated in battery management applications per Diodes' Application Note AN-45449.

What shunt resistor value is recommended for full-scale 10A measurement?

For 10A full-scale with 10mV shunt drop, use R_SHUNT = 10mV / 10A = 1mΩ. With 500V/V gain, this yields 5V output at full scale - ideal for 5V ADCs. At 3.3V supply, maximum measurable current is 6.6A (10mV × 500 = 3.3V), requiring either lower shunt (e.g., 0.66mΩ) or REF bias adjustment for bidirectional scaling.

Does ZXCT211CDW-7 require external compensation components for stability?

No external compensation is required for basic operation. The device is internally compensated for unity-gain stability with capacitive loads ≤1nF. For noisy environments or shunts <1mΩ, Diodes recommends adding matched ≤10Ω series resistors and small ceramic capacitors (e.g., 100pF) at IN+ and IN– per Figure 21 in DS45449 - primarily to dampen inductive ringing, not for loop stability.