Diodes Incorporated ZXCT213BDSJ-7

Overview

ZXCT213BDSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 50V/V fixed gain, designed for unidirectional or bidirectional current monitoring across shunt resistors at common-mode voltages up to 26V. It delivers ±90μV max input offset voltage, ±0.8% max gain error over temperature, and rail-to-rail output swing while operating from 2.7V–26V supply with ≤100μA quiescent current. Used in battery management systems and industrial power supplies for accurate low-side/high-side sensing.

For engineers reviewing the ZXCT213BDSJ-7 datasheet, ZXCT213BDSJ-7 pinout, ZXCT213BDSJ-7 application, or ZXCT213BDSJ-7 equivalent, key selection criteria include its 50V/V gain, -0.3V to 26V common-mode range, SOT363/U-QFN1418-10 package options, ±90μV offset specification, and compatibility with 10mV full-scale shunt drops in high-accuracy current measurement circuits.

Technical Context

The ZXCT213BDSJ-7 implements a zero-drift chopper-stabilized architecture to achieve <0.5μV/°C offset drift and 10ppm/°C gain drift across -40°C to +125°C. Its differential input stage supports both high-side and low-side configurations via IN+ and IN− terminals referenced to a programmable REF pin.

It features rail-to-rail output drive capability (VOL = GND + 5mV, VOH = V+ − 200mV), 80kHz bandwidth, and 25nV/√Hz input voltage noise density - enabling precise DC and low-frequency current measurements without external amplification before ADC conversion.

Key Specifications

Pinout & Package

ZXCT213BDSJ-7 is packaged in the 10-pin U-QFN1418-10 (1.4mm × 1.8mm, 0.5mm pitch) thermally enhanced leadless package with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXCT213BDSJ-7, INA240A1QDRQ1 offers tighter offset but requires redesign for higher gain scaling, while MAX40016ATA+ sacrifices common-mode range and precision for ultra-low supply compatibility - making ZXCT213BDSJ-7 optimal for industrial 24V systems needing 50V/V gain and wide temperature stability.

Availability

ZXCT213BDSJ-7 is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, and server farm PDUs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ZXCT213BDSJ-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 industrial, computing, and communications markets.

ZXCT21x belongs to Diodes' precision analog sensing product line, engineered specifically for high-accuracy, low-power current monitoring in harsh thermal and electrical environments.

FAQ

What is the maximum common-mode voltage the ZXCT213BDSJ-7 can measure?

The ZXCT213BDSJ-7 supports a common-mode input range of -0.3V to 26V. This allows direct sensing on 24V industrial buses or negative-rail configurations without external level-shifting circuitry. The device maintains specified accuracy across this full range at temperatures from -40°C to +125°C, verified per DS45449 Rev. 3-2 Section 4 absolute maximum ratings and Section 6 electrical characteristics.

Can ZXCT213BDSJ-7 be used for bidirectional current sensing?

Yes - by applying a bias voltage (e.g., V+/2) to the REF pin, the output swings above and below that reference to indicate direction of current flow. The datasheet Figure 20 shows the exact configuration, and the rail-to-rail output ensures full dynamic range in both directions. Input bias current matching (±0.02μA) and low offset (±90μV) preserve accuracy during zero-crossing transitions in battery charge/discharge cycles.

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

For 10A full-scale with 10mV shunt drop, use R_SHUNT = 10mV / 10A = 1mΩ. With 50V/V gain, OUT = 10A × 1mΩ × 50 = 500mV - ideal for 3.3V ADCs. The device's 10mV full-scale capability minimizes I²R heating (<100mW), and its 80kHz bandwidth captures fast transients without aliasing. Layout guidelines in DS45449 Section 8 require Kelvin connections and <10Ω series resistance at inputs.

Does ZXCT213BDSJ-7 require external compensation components?

No external compensation is needed for basic operation. The device is unity-gain stable with capacitive loads up to 1nF. However, if input RC filtering is added to suppress shunt inductance (e.g., in high-current motor drives), DS45449 Section 8 specifies RS ≤ 10Ω and CF selected to match L_SHUNT/R_SHUNT time constant. Exceeding 10Ω RS introduces measurable gain error due to input bias current mismatch.