Diodes Incorporated ZXCT210ADSJ-7

Overview

ZXCT210ADSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-shunt monitor IC with 200V/V fixed gain, designed for accurate bidirectional or unidirectional current sensing in high-common-mode-voltage systems up to 26V. It supports shunt voltage drops as low as 10mV, delivers ±30μV max input offset voltage, ±0.8% max gain error over temperature, and operates from 2.7V to 26V supply at ≤100μA quiescent current - enabling high-accuracy, low-power current monitoring in server power supplies and battery management systems.

For engineers reviewing the ZXCT210ADSJ-7 datasheet, ZXCT210ADSJ-7 pinout, ZXCT210ADSJ-7 application, or ZXCT210ADSJ-7 equivalent, key selection criteria include its U-QFN1418-10 package, rail-to-rail output swing, -0.3V to 26V common-mode input range, 10ppm/°C gain drift, and compatibility with ADC interfaces for real-time load current digitization in industrial and computing power rails.

Technical Context

The ZXCT210ADSJ-7 implements a precision zero-drift chopper-stabilized amplifier architecture with post-trim calibration, achieving ±30μV max input offset voltage and 0.1μV/°C typical offset drift across -40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26V while operating from a supply as low as 2.7V - enabling high-side sensing on 12V/24V rails without level-shifting.

It features a fixed 200V/V gain, rail-to-rail output capable of driving 10kΩ loads within 50mV of supply rails, and 14kHz small-signal bandwidth (C_L = 10pF). Input bias current remains below 35μA across full common-mode range, and CMRR exceeds 100dB over temperature.

Key Specifications

Pinout & Package

ZXCT210ADSJ-7 is housed in a 10-pin U-QFN1418-10 package (1.4mm × 1.8mm, 0.5mm pitch), thermally enhanced with exposed thermal pad (Pin 9) for improved power dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40010FAUA+, ZXCT210ADSJ-7 offers superior thermal stability (0.1μV/°C vs. 0.5μV/°C) and lower quiescent current (100μA vs. 1.1mA), making it optimal for always-on industrial monitoring where long-term drift and power budget are critical.

Availability

ZXCT210ADSJ-7 is available at Aetrix Electronics and suitable for server power rail monitoring, battery management systems, industrial PLC I/O modules, and high-performance GPU power delivery requiring stable component supply, precise current feedback, and extended temperature operation.

Supply support for ZXCT210ADSJ-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient components for power management, signal integrity, and protection.

The ZXCT21x series belongs to Diodes' precision analog portfolio, engineered specifically for high-accuracy, low-drift current sensing in industrial, computing, and telecom infrastructure where measurement stability across wide voltage and temperature ranges is essential.

FAQ

What is the function of the REF pin on ZXCT210ADSJ-7?

The REF pin sets the DC bias point of the OUT voltage. For unidirectional sensing, it is typically tied to GND or V+ to produce a 0–V+ output swing. For bidirectional sensing (e.g., battery charge/discharge), it is biased to V+/2, allowing OUT to swing symmetrically above and below that midpoint - enabling detection of current direction and magnitude with a single-ended ADC.

Can ZXCT210ADSJ-7 operate with a 3.3V supply while measuring a 24V common-mode voltage?

Yes. The device supports a 2.7V to 26V supply and a -0.3V to 26V common-mode input range independently. With V+ = 3.3V, it accurately amplifies the differential voltage across a shunt placed on a 24V rail, delivering a 0–3.3V output referenced to the 3.3V supply - eliminating need for level shifters or isolated supplies.

How does the zero-drift architecture improve measurement accuracy?

Zero-drift topology uses chopper stabilization and auto-zeroing to cancel input offset voltage and its temperature drift. This achieves ±30μV max offset and 0.1μV/°C typical drift - reducing error contributions from thermal gradients and long-term aging, which is critical for applications like energy metering and battery capacity tracking where cumulative error must remain under 0.1% over years of operation.

Is external filtering required on the IN+ and IN− pins?

External RC filtering is recommended only in noisy environments or when shunt inductance causes ringing. Input resistors must be ≤10Ω to avoid gain/CMRR degradation from bias current mismatch. A matched 5Ω resistor with 0.01µF capacitor per input (as shown in Figure 21) effectively suppresses RF interference while preserving DC accuracy and bandwidth up to 14kHz.