Diodes Incorporated ZXCT213QADW-7

Overview

ZXCT213QADW-7 from Diodes Incorporated is an automotive-grade, zero-drift high-precision current-shunt monitor with 50V/V fixed gain, designed for unidirectional or bidirectional current sensing in high-common-mode voltage systems up to 26V. It achieves ±100μV max offset voltage, ±0.8% max gain error over temperature, and operates from 2.7V to 26V supply with only 100μA quiescent current. It enables accurate measurement of 10mV shunt drops in EV battery management, motor control, and ADAS power stages.

For engineers reviewing the ZXCT213QADW-7 datasheet, ZXCT213QADW-7 pinout, ZXCT213QADW-7 application, or ZXCT213QADW-7 equivalent, this device is selected for high-accuracy, low-power, AEC-Q100 Grade 1 current monitoring where rail-to-rail output swing, -40°C to +125°C operation, and minimal shunt power loss are critical design requirements.

Technical Context

The ZXCT213QADW-7 uses a zero-drift chopper-stabilized architecture with post-trim calibration to maintain ±100μV max input offset and 10ppm/°C max gain drift across its full operating range. Its differential input stage supports common-mode voltages from -0.3V to 26V - exceeding its own 2.7V–26V supply rail - enabling direct high-side sensing on 12V/24V/48V automotive rails without level shifting.

It delivers rail-to-rail output swing (within 50mV of V+ and 5mV of GND) into 10kΩ loads, features 80kHz bandwidth at C_L = 10pF, and integrates internal gain-setting resistors for fixed 50V/V amplification. The REF pin allows external biasing for bidirectional current sensing, while IN+ and IN− inputs are optimized for Kelvin connection to low-value shunts.

Key Specifications

Pinout & Package

Supplied in a 6-pin SOT363 package (2.2mm × 2.1mm × 1.0mm), surface-mount, lead-free, RoHS 3 and AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1, ZXCT213QADW-7 offers 26V common-mode capability and 100× lower quiescent current but higher offset; versus ZXCT214QADW-7, it provides half the gain for improved dynamic range with 10mV shunts while accepting slightly higher offset tolerance.

Availability

ZXCT213QADW-7 is available at Aetrix Electronics and suitable for EV battery management, automotive body control, electric power steering, and ADAS radar subsystems requiring stable component supply across extended product lifecycles.

Supply support for ZXCT213QADW-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 automotive, industrial, and consumer markets, with ISO/TS 16949-certified manufacturing.

The ZXCT21xQ series belongs to Diodes' automotive-qualified current-sensing amplifier product line, engineered specifically for high-accuracy, low-power, high-common-mode monitoring in AEC-Q100-compliant powertrain and chassis systems.

FAQ

What is the maximum common-mode voltage the ZXCT213QADW-7 can measure?

The ZXCT213QADW-7 supports a common-mode input range of -0.3V to 26V, meaning it can accurately sense current across shunts placed on voltage rails up to 26V - even when powered from a lower supply such as 3.3V or 5V. This eliminates need for external level-shifting circuitry in 12V/24V automotive systems.

Can the ZXCT213QADW-7 be used for bidirectional current sensing?

Yes - by applying a stable DC bias voltage (e.g., V+/2) to the REF pin, the output swings above and below that reference in proportion to forward or reverse current flow. This configuration is commonly used in battery management systems for charge/discharge monitoring, with IN+ and IN− connected across the shunt in standard Kelvin fashion.

How does the 50V/V gain affect shunt resistor selection?

With 50V/V gain, a 10mV full-scale shunt drop produces 500mV at OUT - ideal for direct interface with 3.3V or 5V ADCs having 12-bit+ resolution. For example, a 100μΩ shunt carrying 100A yields 10mV drop; using ZXCT213QADW-7 avoids excessive I²R heating while preserving measurement fidelity.

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

Input filtering is recommended only in high-noise or high-dI/dt environments (e.g., motor inverters). If used, series resistors must be ≤10Ω to avoid degrading CMRR and introducing gain error; matching is critical. A small capacitor (e.g., 100pF) may be added from each input to GND to suppress RF interference without affecting DC accuracy.