Diodes Incorporated ZXCT213ADSJ-7

Overview

ZXCT213ADSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 50V/V fixed gain, designed for bidirectional or unidirectional shunt-based current monitoring at common-mode voltages up to 26V. It supports 10mV full-scale shunt drops, delivers ±90μV max input offset voltage (B version), and operates from 2.7V to 26V supply across –40°C to +125°C - enabling accurate battery charge/discharge sensing in industrial power supplies.

For engineers reviewing the ZXCT213ADSJ-7 datasheet, ZXCT213ADSJ-7 pinout, ZXCT213ADSJ-7 application, or ZXCT213ADSJ-7 equivalent, key selection criteria include its U-QFN1418-10 package, rail-to-rail output swing, 80kHz bandwidth, 10ppm/°C gain drift, and compatibility with low-side/high-side configurations requiring sub-1% total error over temperature.

Technical Context

The ZXCT213ADSJ-7 implements a precision zero-drift chopper-stabilized architecture to suppress input offset drift, achieving ±90μV max V_OS and 0.1–0.5μV/°C dV_OS/dT over –40°C to +125°C. Its differential input stage accepts common-mode voltages from –0.3V to 26V independent of supply voltage, enabling direct sensing on high-voltage rails while powered from as low as 2.7V.

It features a fixed 50V/V gain, rail-to-rail output capable of sourcing/sinking ±3mA, and internal bias circuitry optimized for <10Ω external series resistance on IN+/IN– to preserve CMRR (>95dB) and gain accuracy. The REF pin allows flexible output centering for bidirectional current measurement.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA240A1QDRQ1 and MAX4080TASA+, the ZXCT213ADSJ-7 uniquely balances 26V common-mode capability, 50V/V gain for 10mV shunts, U-QFN1418-10 miniaturization, and 100μA IQ - making it optimal for space-constrained industrial 12V/24V systems requiring calibrated-free operation.

Availability

ZXCT213ADSJ-7 is available at Aetrix Electronics and suitable for battery management systems, industrial DC power supplies, server rack PDUs, and high-performance GPU power delivery requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ZXCT213ADSJ-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 for power management, signal integrity, and connectivity applications.

The ZXCT21x series was developed specifically for high-accuracy, low-power current sensing in industrial, computing, and telecom infrastructure - emphasizing zero-drift stability, wide common-mode operation, and compact packaging for modern power-dense designs.

FAQ

What is the maximum shunt voltage the ZXCT213ADSJ-7 can accurately measure?

The ZXCT213ADSJ-7 supports full-scale shunt voltage drops of 10mV, producing a 500mV output (50V/V × 10mV). With rail-to-rail output and 2.7V–26V supply, it can resolve shunt voltages up to 60mV (yielding 3.0V out at 3.3V supply) while maintaining linearity and low gain error. Its design targets minimal power loss and high accuracy at this low differential range.

Can the ZXCT213ADSJ-7 be used for bidirectional current sensing?

Yes - by applying a bias voltage (typically V+/2) to the REF pin, the OUT pin swings symmetrically around that reference, enabling positive/negative output for charge/discharge current direction. The device's rail-to-rail output and low offset ensure clean zero-crossing detection. External low-impedance REF drive is mandatory to avoid gain and offset errors.

What layout considerations are critical for achieving specified accuracy?

Place the IN+ and IN– pins directly across the shunt resistor with Kelvin connections; keep series resistance on those traces ≤10Ω to prevent CMRR degradation and gain error. Use a solid ground plane under the U-QFN1418-10, place 100nF ceramic bypass cap between V+ and GND <1mm from pins 6 and 9, and route REF with low-impedance trace to a dedicated voltage divider or buffer.

How does the zero-drift architecture improve long-term reliability in industrial environments?

The chopper-stabilized zero-drift design reduces input offset drift to <0.5μV/°C and limits long-term V_OS shift to <150μV after 1000h HTOL testing at +125°C. This eliminates field recalibration cycles in harsh thermal environments (e.g., factory automation cabinets), extending mean time between maintenance by ≥3 years versus conventional amplifiers.