Diodes Incorporated ZXCT214QBDW-7

Overview

ZXCT214QBDW-7 from Diodes Incorporated is an automotive-grade, zero-drift high-precision current-shunt monitor with 100 V/V fixed gain, ±60 µV max input offset voltage, and rail-to-rail output swing. It measures shunt voltages as low as 10 mV across common-mode voltages from –0.3 V to 26 V while operating from a 2.7 V to 26 V supply. It is used in EV battery management systems for accurate bidirectional current sensing under harsh thermal conditions.

For engineers reviewing the ZXCT214QBDW-7 datasheet, ZXCT214QBDW-7 pinout, ZXCT214QBDW-7 application, or ZXCT214QBDW-7 equivalent, this device supports AEC-Q100 Grade 1 qualification, offers 10 ppm/°C gain drift, delivers 30 kHz bandwidth at 10 pF load, and enables low-power (100 µA max) high-side/low-side current monitoring in safety-critical automotive subsystems.

Technical Context

The ZXCT214QBDW-7 employs a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±60 µV max offset voltage and 10 ppm/°C gain drift over –40°C to +125°C. Its differential input stage supports unidirectional and bidirectional sensing via REF pin biasing, enabling precise current measurement even when common-mode voltage exceeds supply voltage.

It features rail-to-rail output drive into 10 kΩ loads, 100 dB CMRR at full temperature range, and operates with only 100 µA quiescent current. The internal gain-setting network is laser-trimmed for 100 V/V accuracy, eliminating external resistor matching requirements while maintaining 0.8% max gain error over temperature.

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 automotive current sensing applications.

Compared with INA240A1QDRQ1 and MAX40056ATA+T, ZXCT214QBDW-7 uniquely balances 100 V/V gain, 26 V common-mode tolerance, and AEC-Q100 Grade 1 compliance in a 6-pin SOT363 package-making it optimal for space-constrained, high-accuracy current sensing in 12 V/24 V automotive subsystems without external gain staging.

Availability

ZXCT214QBDW-7 is available at Aetrix Electronics and suitable for electric vehicle battery management, automotive body control modules, electric power steering systems, and on-board chargers requiring stable component supply across extended temperature and automotive lifecycle demands.

Supply support for ZXCT214QBDW-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, with ISO/TS 16949-certified manufacturing and AEC-Q100 validation capabilities.

The ZXCT21xQ series is part of Diodes' automotive-qualified precision analog portfolio, designed specifically for high-accuracy current sensing in safety-critical vehicle electrification systems including BMS, OBC, and ADAS power domains.

FAQ

What is the maximum common-mode voltage the ZXCT214QBDW-7 can handle?

The ZXCT214QBDW-7 supports a common-mode input voltage range of –0.3 V to 26 V. This allows direct high-side sensing on 12 V and 24 V automotive battery rails without external level-shifting circuitry. The device maintains specified accuracy across this full range at temperatures from –40°C to +125°C, as validated per AEC-Q100 stress testing protocols.

Can the ZXCT214QBDW-7 be used for bidirectional current sensing?

Yes-the ZXCT214QBDW-7 supports bidirectional sensing by applying a bias voltage (e.g., V+/2) to the REF pin. This centers the output voltage, allowing positive and negative current flow to produce corresponding above- and below-reference output swings. The rail-to-rail output stage ensures full dynamic range utilization for both directions without clipping.

What shunt resistor value is recommended for 100 A full-scale measurement?

For 100 A full-scale with 10 mV shunt drop, a 0.1 mΩ shunt is required (R = V/I = 10 mV / 100 A). This value minimizes power loss (P = I²R = 1 W) and thermal drift. The ZXCT214QBDW-7's 100 V/V gain converts this to 1 V output, directly compatible with standard 1 V FS ADC references. Layout must minimize parasitic resistance in shunt connections to preserve accuracy.

How does the zero-drift architecture improve long-term stability?

The zero-drift chopper-stabilized design reduces input offset voltage drift to ≤0.5 µV/°C and eliminates 1/f noise, ensuring stable baseline performance over temperature and time. Post-trim manufacturing guarantees ±60 µV max offset across –40°C to +125°C, avoiding calibration drift that would otherwise degrade SOC estimation accuracy in EV battery systems over 10+ years of operation.