Diodes Incorporated ZXCT215ADSJ-7

Overview

ZXCT215ADSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 75V/V fixed gain, designed for bidirectional or unidirectional shunt-based current monitoring at common-mode voltages up to 26V. It delivers ±60μV max input offset voltage, ±0.8% max gain error over temperature, and rail-to-rail output swing while operating from 2.7V–26V supply. Used in battery management systems to monitor charge/discharge currents with 10mV full-scale shunt drop.

For engineers reviewing the ZXCT215ADSJ-7 datasheet, ZXCT215ADSJ-7 pinout, ZXCT215ADSJ-7 application, or ZXCT215ADSJ-7 equivalent, key selection criteria include its 75V/V gain option, U-QFN1418-10 package thermal performance (RθJA = 115°C/W), -40°C to +125°C operation, and support for both high-side and low-side sensing configurations with external REF biasing.

Technical Context

The ZXCT215ADSJ-7 implements a zero-drift chopper-stabilized architecture to achieve ±0.5μV/°C typical offset drift and <10ppm/°C gain drift across -40°C to +125°C. Its differential input stage operates with -0.3V to 26V common-mode range independent of supply voltage, enabling measurement on rails far exceeding V+.

It features rail-to-rail output capable of sourcing/sinking ≥2mA while maintaining ±0.05V swing margin to supply rails, and integrates internal gain-setting resistors optimized for 75V/V. Input bias current remains ≤35μA across full common-mode range, minimizing shunt resistor interaction when RS ≤10Ω is used for filtering.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40016ATA+T, the ZXCT215ADSJ-7 uniquely combines 75V/V gain, ±60μV offset, bidirectional REF control, and U-QFN1418-10 thermal performance-making it optimal for space-constrained, wide-temp BMS and industrial monitoring where precision and configurability are critical.

Availability

ZXCT215ADSJ-7 is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, server rack PDUs, and GPU power rail monitoring requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.

Supply support for ZXCT215ADSJ-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 is part of Diodes' precision analog portfolio, engineered specifically for high-accuracy, low-power current sensing in harsh industrial and computing environments with extended temperature operation and robust EMC performance.

FAQ

What is the function of the REF pin on ZXCT215ADSJ-7?

The REF pin sets the output voltage midpoint for bidirectional current sensing. When biased to V+/2, it enables the OUT pin to swing symmetrically above and below that voltage-e.g., 0.5V to 2.5V for a 3V supply-allowing single-supply ADCs to measure both charge and discharge currents without polarity reversal or external op-amp circuitry.

Can ZXCT215ADSJ-7 operate with a 3.3V supply while measuring a 24V common-mode voltage?

Yes. The device supports -0.3V to 26V common-mode input voltage independently of supply voltage. With V+ = 3.3V, it accurately measures current through a shunt placed on a 24V rail, provided IN+ and IN− are connected directly across the shunt and layout minimizes parasitic impedance-enabling high-side sensing without level shifters or isolated supplies.

What is the maximum capacitive load the ZXCT215ADSJ-7 output can drive without instability?

The output is stable with up to 1nF capacitive load, as specified in the datasheet. Driving larger capacitive loads (e.g., long PCB traces or ADC input capacitance >1nF) requires an external series resistor (typically 10–50Ω) between OUT and the load to maintain phase margin and prevent oscillation-verified via stability testing under worst-case temperature and supply conditions.

How does the zero-drift architecture improve measurement accuracy over temperature?

Zero-drift topology uses auto-zeroing and chopper stabilization to reduce input offset voltage drift to ±0.5μV/°C typical. This limits total offset error to <75μV across -40°C to +125°C-far superior to standard amplifiers (often >10μV/°C)-ensuring consistent 10mV shunt drop interpretation without periodic recalibration in thermally varying environments like server racks or automotive ECUs.