Diodes Incorporated ZXCT214CDSJ-7

Overview

ZXCT214CDSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 100 V/V fixed gain, ±0.5% max gain error over temperature, ±60 µV max input offset voltage, and rail-to-rail output swing. It operates from 2.7V to 26V supply, supports common-mode voltages from –0.3V to 26V, and enables accurate 10mV full-scale shunt measurements in high-side or low-side configurations for battery management systems.

For engineers reviewing the ZXCT214CDSJ-7 datasheet, ZXCT214CDSJ-7 pinout, ZXCT214CDSJ-7 application, or ZXCT214CDSJ-7 equivalent, key selection criteria include its C-grade precision (±0.5% gain error, ±60 µV VOS), U-QFN1418-10 package thermal performance (RθJA = 115°C/W), and compatibility with unidirectional/bidirectional current sensing at industrial temperatures (–40°C to +125°C).

Technical Context

The ZXCT214CDSJ-7 uses a zero-drift chopper-stabilized architecture to achieve <0.5 µV/°C offset drift and 10 ppm/°C gain drift across –40°C to +125°C. Its input stage handles differential shunt voltages up to ±5 mV while rejecting common-mode signals up to 26 V - exceeding its own supply voltage.

It features rail-to-rail output drive into 10 kΩ loads, 30 kHz bandwidth (C_L = 10 pF), and 25 nV/√Hz input voltage noise. The REF pin allows flexible biasing for bidirectional sensing, and internal post-trim calibration ensures guaranteed performance without external trimming.

Key Specifications

Pinout & Package

Package: U-QFN1418-10 (1.4 mm × 1.8 mm, 0.5 mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDGKRQ1 and MAX40010FAUA+, the ZXCT214CDSJ-7 uniquely supports 26 V common-mode on a 2.7–26 V supply with REF-biased bidirectional operation - making it optimal for universal industrial and telecom current sensing where voltage domain flexibility and polarity detection are essential.

Availability

ZXCT214CDSJ-7 is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, server rack PDUs, and high-performance GPU power rail monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for ZXCT214CDSJ-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 series is part of Diodes' precision analog portfolio, designed specifically for high-accuracy, wide common-mode current sensing in industrial, computing, and telecom infrastructure where zero-drift performance and supply voltage flexibility are critical.

FAQ

What is the maximum shunt voltage the ZXCT214CDSJ-7 can accurately measure?

The ZXCT214CDSJ-7 is specified for full-scale shunt drops of 10 mV, delivering 1.0 V output (100 × 10 mV). With ±60 µV offset and ±0.5% gain error, it maintains <0.1% total error up to 10 mV. Larger drops (e.g., 20 mV) cause output saturation above V+ – 0.05 V and are not supported by datasheet specifications.

Can the ZXCT214CDSJ-7 be used for bidirectional current sensing?

Yes - by applying a mid-supply reference voltage (e.g., V+/2) to the REF pin, the output swings symmetrically around that bias point. This enables detection of current direction in battery charging/discharging or motor drive applications. The device's rail-to-rail output and low offset ensure minimal dead zone near zero current.

Does the U-QFN1418-10 package require special PCB layout considerations?

Yes - the exposed thermal pad must be soldered to a minimum 25 mm² copper pour connected to GND for thermal performance (RθJA = 115°C/W). Input traces (IN+, IN–) must be matched and routed close to the shunt resistor with guard rings to minimize parasitic impedance and CMRR degradation. REF and GND traces should be short and low-impedance.

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

The chopper-stabilized zero-drift design reduces input offset drift to 0.1 µV/°C typical and eliminates 1/f noise, ensuring stable baseline over time and temperature. Unlike standard op-amps, it avoids thermal hysteresis and long-term VOS drift - critical for applications like energy metering or battery coulomb counting where accumulated error directly impacts accuracy over months of operation.