Diodes Incorporated ZXCT212QCDW-7

Overview

ZXCT212QCDW-7 from Diodes Incorporated is an automotive-grade, zero-drift, high-precision current-sense amplifier with 1000 V/V fixed gain, ±30 µV max offset voltage, and -0.3 V to 26 V common-mode input range. It operates from 2.7 V to 26 V supply, draws ≤100 µA quiescent current, and delivers rail-to-rail output for accurate low-side or high-side shunt monitoring in EV battery management systems.

For engineers reviewing the ZXCT212QCDW-7 datasheet, ZXCT212QCDW-7 pinout, ZXCT212QCDW-7 application, or ZXCT212QCDW-7 equivalent, this device supports 10 mV full-scale shunt sensing, AEC-Q100 Grade 1 qualification, and ±0.5% max gain error over -40°C to +125°C - critical for BMS, OBC, and ADAS current monitoring where precision and temperature stability are non-negotiable.

Technical Context

The ZXCT212QCDW-7 implements a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±30 µV max input offset and 10 ppm/°C max gain drift across its full operating temperature range. Its differential input stage rejects common-mode voltages up to 26 V while powered from as low as 2.7 V, enabling direct sensing on high-voltage rails without level-shifting.

It features rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND), 4 kHz bandwidth (C_L = 10 pF), and 120 dB CMRR at DC, supporting unidirectional and bidirectional current measurement via configurable REF pin biasing. Input bias currents remain below 35 µA across -0.3 V to 26 V common-mode range.

Key Specifications

Pinout & Package

Supplied in a 6-pin SOT363 package (2.2 mm × 2.1 mm × 1.0 mm), surface-mount, RoHS-compliant, halogen-free, and qualified to AEC-Q100 Grade 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the ZXCT212QCDW-7 delivers the lowest offset (±30 µV), highest CMRR (120 dB), and smallest footprint (SOT363), making it optimal for high-density, high-accuracy EV power monitoring where thermal stability and space constraints are critical.

Availability

ZXCT212QCDW-7 is available at Aetrix Electronics and suitable for electric vehicle battery management systems, automotive on-board chargers, and ADAS power distribution modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ZXCT212QCDW-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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with core expertise in power management, signal integrity, and automotive-qualified components.

The ZXCT21xQ series belongs to Diodes' automotive-optimized current-sense amplifier product line, designed specifically for high-accuracy, high-common-mode, zero-drift current monitoring in EV traction inverters, BMS, and ADAS power domains.

FAQ

What is the maximum common-mode voltage the ZXCT212QCDW-7 can measure?

The ZXCT212QCDW-7 supports a common-mode input range of -0.3 V to 26 V, meaning it can accurately sense current across shunt resistors placed on voltage rails up to 26 V - including 12 V, 24 V, and 48 V automotive systems - regardless of its own 2.7 V–26 V supply voltage. This enables direct high-side sensing without external level-shifting circuitry.

Does the ZXCT212QCDW-7 require external calibration for offset or gain error?

No external calibration is required. The device uses factory post-trim zero-drift architecture to guarantee ±30 µV max input offset voltage and ±0.5% max gain error over -40°C to +125°C. These parameters are production-tested and do not drift significantly over time or temperature, eliminating the need for system-level trimming in automotive applications.

Can the ZXCT212QCDW-7 be used for bidirectional current sensing?

Yes - by applying a stable bias voltage (e.g., V+/2) to the REF pin, the output swings symmetrically around that reference, enabling measurement of current flow in both directions. This configuration is commonly used in battery management systems for charge/discharge monitoring, and requires a low-impedance REF source per the datasheet.

What is the recommended PCB layout practice for minimizing error in high-accuracy current sensing?

Place IN+ and IN− pins as close as possible to the shunt resistor terminals to avoid parasitic resistance and pickup; use Kelvin connections; route REF and GND with short, low-inductance traces; place 100 nF ceramic bypass capacitor between V+ and GND near the device; and avoid routing noisy signals (e.g., PWM, CAN) adjacent to sensitive analog inputs.