Diodes Incorporated ZXCT211QCDW-7

Overview

ZXCT211QCDW-7 from Diodes Incorporated is an automotive-grade, zero-drift current-sense amplifier with 500 V/V fixed gain, ±30 µV max offset voltage, and ±0.5% max gain error over –40°C to +125°C. It operates from 2.7V to 26V supply, supports common-mode voltages from –0.3V to 26V, and delivers rail-to-rail output for precise high-side or low-side shunt monitoring in EV battery management systems.

For engineers reviewing the ZXCT211QCDW-7 datasheet, ZXCT211QCDW-7 pinout, ZXCT211QCDW-7 application, or ZXCT211QCDW-7 equivalent, this device is selected for high-accuracy bidirectional current sensing where sub-10mV shunt drops, ultra-low drift (≤0.5 µV/°C), and AEC-Q100 Grade 1 qualification are mandatory.

Technical Context

The ZXCT211QCDW-7 uses a chopper-stabilized zero-drift architecture to achieve ±30 µV max input offset and ≤0.5 µV/°C offset drift across –40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26V while powered from as low as 2.7V, enabling direct measurement on high-voltage rails like 400V EV battery stacks via level-shifted shunts.

It features internal gain-setting resistors (500 V/V), rail-to-rail output swing (within 50 mV of rails), and 10 ppm/°C max gain drift. The REF pin accepts external bias for bidirectional operation, and the device maintains 95 dB CMRR over full temperature range without external trimming.

Key Specifications

Pinout & Package

Package: 6-pin SOT363 (2.15 mm × 2.10 mm × 0.95 mm), RoHS-compliant, halogen-free, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the ZXCT211QCDW-7 uniquely combines AEC-Q100 Grade 1 qualification, ±0.5% gain error over full automotive temperature range, and 10 mV full-scale capability-making it the only option qualified for precision shunt monitoring in EV battery packs and high-temperature motor control zones.

Availability

ZXCT211QCDW-7 is available at Aetrix Electronics and suitable for electric vehicle battery management systems, automotive high-voltage DC/DC converters, and electric power steering motor controls requiring stable component supply across multi-year production programs.

Supply support for ZXCT211QCDW-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 for automotive, industrial, and consumer markets, with IATF 16949-certified facilities.

The ZXCT21xQ series is part of Diodes' automotive-qualified analog portfolio, engineered specifically for high-accuracy current sensing in harsh-temperature, high-reliability vehicle subsystems including BMS, OBC, and ADAS power stages.

FAQ

What is the maximum common-mode voltage the ZXCT211QCDW-7 can measure?

The ZXCT211QCDW-7 supports a common-mode input voltage range of –0.3 V to 26 V. This allows direct high-side current sensing on 12 V and 24 V automotive rails, and low-side sensing with negative transients down to –0.3 V. It does not support common-mode voltages exceeding 26 V, even with external protection circuitry.

Can the ZXCT211QCDW-7 be used for bidirectional current sensing?

Yes - bidirectional operation is enabled by applying a bias voltage (typically V+/2) to the REF pin. This centers the output voltage, allowing positive and negative current flow to produce corresponding increases or decreases in output voltage relative to the bias point, as confirmed in the device's typical application circuit (Figure 20).

What is the minimum shunt resistor value supported for full-scale measurement?

With a 10 mV full-scale shunt drop and 500 V/V gain, the ZXCT211QCDW-7 achieves 5.0 V output at full scale. For a 10 A load, a 1 mΩ shunt yields exactly 10 mV drop - making 1 mΩ the practical minimum for full-scale 10 A measurement. Lower values require proportionally higher current to reach full scale.

Does the ZXCT211QCDW-7 require external gain-setting resistors?

No - the 500 V/V gain is internally fixed using laser-trimmed thin-film resistors. No external resistors are needed for gain configuration. External components are limited to power supply decoupling capacitors, optional input RC filters (with RS ≤ 10 Ω), and REF bias network - all specified in the datasheet's application section.